1
|
Ambrose B, Sathyaraj G, Kathiresan M. Evaluation of the complexation behaviour among functionalized diphenyl viologens and cucurbit[7] and [8]urils. Sci Rep 2024; 14:5786. [PMID: 38461363 PMCID: PMC10924918 DOI: 10.1038/s41598-024-56370-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 03/04/2024] [Indexed: 03/11/2024] Open
Abstract
The complexation behaviour of Diphenyl viologens (DPVs) with Cucurbit[n]urils (CB[n]) was evaluated in detail and the results were reported. In this work, we present the synthesis of various DPVs functionalised with electron withdrawing and electron donating groups (EWGs & EDGs) and investigate their complexation behaviour with CB[7] and CB [8]. Carboxylic acid functionalized DPV's (DPV-COOH) complexation with CB[8] gives additional insights, i.e., indicates hydrogen bonding plays an effective role in the complexation. The formation of a 2:2 quaternary complex of DPV-COOH/CB[8] under neutral pH conditions was supported by various analytical techniques. The complexation of DPVs with CB[7] specifies that irrespective of the functional group attached, they all form a 1:2 ternary complex, but the findings elaborate that the pattern followed in the complexation depends on the EW or EDG attached to the DPVs. The competition experiments conducted between functionalized DPVs and CB[7], CB[8] shows that they have more affinity towards CB[8] than CB[7] because of the better macrocyclic confinement effect of CB[8], as confirmed using UV-Vis spectroscopy. The binding affinity among EWG and EDG functionalised DPVs with CB[8] concludes EDG functionalised DPVs show better affinity towards CB[8], because they can form a charge transfer complex inside the CB[8] cavity. Exploring these host-guest interactions in more complex biological or environmental settings and studying their impact on the functionality of DPVs could be an exciting avenue for future research.
Collapse
Affiliation(s)
- Bebin Ambrose
- Electro Organic and Materials Electrochemistry Division, CSIR-CECRI, Tamil Nadu, Karaikudi, 630 003, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Gopal Sathyaraj
- CLRI-CATERS, CSIR-Central Leather Research Institute, Tamil Nadu, Chennai, 600020, India
| | - Murugavel Kathiresan
- Electro Organic and Materials Electrochemistry Division, CSIR-CECRI, Tamil Nadu, Karaikudi, 630 003, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
| |
Collapse
|
2
|
Escorihuela E, Del Barrio J, Davidson RJ, Beeby A, Low PJ, Prez-Murano F, Cea P, Martin S. Large area arrays of discrete single-molecule junctions derived from host-guest complexes. NANOSCALE 2024; 16:1238-1246. [PMID: 38116590 DOI: 10.1039/d3nr05122f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
The desire to continually reduce the lower limits of semiconductor integrated circuit (IC) fabrication methods continues to inspire interest in unimolecular electronics as a platform technology for the realization of future (opto)electronic devices. However, despite successes in developing methods for the construction and measurement of single-molecule and large-area molecular junctions, exercising control over the precise junction geometry remains a significant challenge. Here, host-guest complexes of the wire-like viologen derivative 1,1'-bis(4-(methylthio)-phenyl)-[4,4'-bipyridine]-1,1'-diium chloride ([1][Cl]2) and cucurbit[7]uril (CB[7]) have been self-assembled in a regular pattern over a gold substrate. Subsequently, ligandless gold nanoparticles (AuNPs) synthesized in situ are deposited over the host-guest array. The agreement between the conductance of individual mono-molecular junctions, appropriately chosen as a function of the AuNP diameter, within this array determined by conductive probe atomic force microscope (c-AFM) and true single-molecule measurements for a closely similar host-guest complex within a scanning tunneling microscope break-junction (STM-BJ) indicates the formation of molecular junctions derived from these host-guest complexes without deleterious intermolecular coupling effects.
Collapse
Affiliation(s)
- Enrique Escorihuela
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain.
- Departamento de Química Física, Universidad de Zaragoza, 50009, Zaragoza, Spain
| | - Jesús Del Barrio
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain.
- Departamento de Química Orgánica, Universidad de Zaragoza, 50009, Zaragoza, Spain
| | - Ross J Davidson
- Department of Chemistry, Durham University, South Rd, Durham, DH1 3LE, UK
| | - Andrew Beeby
- Department of Chemistry, Durham University, South Rd, Durham, DH1 3LE, UK
| | - Paul J Low
- School of Molecular Sciences, University of Western Australia, 35 Stirling Highway, Crawley, 6009, Western Australia, Australia
| | - Francesc Prez-Murano
- Institute of Microelectronics of Barcelona (IMB-CNM, CSIC), 08193, Bellaterra, Spain
| | - Pilar Cea
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain.
- Departamento de Química Física, Universidad de Zaragoza, 50009, Zaragoza, Spain
- Laboratorio de Microscopias Avanzadas (LMA), Universidad de Zaragoza, 50018, Zaragoza, Spain
| | - Santiago Martin
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain.
- Departamento de Química Física, Universidad de Zaragoza, 50009, Zaragoza, Spain
- Laboratorio de Microscopias Avanzadas (LMA), Universidad de Zaragoza, 50018, Zaragoza, Spain
| |
Collapse
|
3
|
Liu F, Kriat A, Rosas R, Bergé-Lefranc D, Gigmes D, Pascal S, Siri O, Liu S, Kermagoret A, Bardelang D. Controlled oligomeric guest stacking by cucurbiturils in water. Org Biomol Chem 2023; 21:9433-9442. [PMID: 37991010 DOI: 10.1039/d3ob01723k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2023]
Abstract
Previously, we reported a guest molecule containing a viologen (V), a phenylene (P) and an imidazole (I) fragment (VPI) forming a host : guest 2 : 2 complex with cucurbit[8]uril (CB[8]) and an unprecedented 2 : 3 complex with cucurbit[10]uril (CB[10]). To better address the structural features required to form these complexes, two VPI analogues were designed and synthesized: the first with a tolyl (T) group grafted on the V part (T-VPI) and the second with a naphthalene (N) fused on the imidazole (I) part (VPI-N). While VPI-N afforded a discrete well-defined 2 : 2 complex with CB[8] and a 2 : 3 complex with CB[10], T-VPI organized also as a 2 : 2 complex with CB[8] but no well-defined complex was obtained with CB[10]. These complexes were studied by NMR spectroscopy, notably DOSY, which allowed us to estimate binding constants for 2 : 2 complex formation with CB[8], pointing to more stable 2 : 2 complexes with more hydrophobic guests. UV-vis and fluorescence spectroscopy confirmed complex formation, suggesting host-stabilized charge-transfer interactions. Therefore, the simple addition of CB[8] or CB[10] enabled us to control the level of guest stacking (dimer or trimer) using relevant pairs of synthetic hosts through spontaneous host : guest quaternary or quinary self-assembly.
Collapse
Affiliation(s)
- Fengbo Liu
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, People's Republic of China.
| | - Amine Kriat
- Aix Marseille Univ, CNRS, ICR, AMUTech, Marseille, France.
| | - Roselyne Rosas
- Aix Marseille Univ, CNRS, FSCM, Spectropole, Marseille, France
| | | | - Didier Gigmes
- Aix Marseille Univ, CNRS, ICR, AMUTech, Marseille, France.
| | - Simon Pascal
- Aix Marseille Univ, CNRS, CINAM, AMUTech, Marseille, France.
| | - Olivier Siri
- Aix Marseille Univ, CNRS, CINAM, AMUTech, Marseille, France.
| | - Simin Liu
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, People's Republic of China.
| | | | | |
Collapse
|
4
|
Teng Y, Li X, Chen Y, Xu P, Pan Z, Shao K, Sun N. Cucurbit[8]uril-mediated SERS plasmonic nanostructures with sub-nanometer gap for the identification and determination of estrogens. Mikrochim Acta 2023; 190:185. [PMID: 37071210 DOI: 10.1007/s00604-023-05765-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 03/26/2023] [Indexed: 04/19/2023]
Abstract
The SERS intensity of analytes is primarily influenced by the density and distribution of hotspots, which are often difficult to manipulate or regulate. In this study, cucurbit[8]uril (CB[8]), a kind of rigid macrocyclic molecule, was introduced to achieve ~ 1-nm nanogap between gold nanoparticles to increase the density of SERS hotspots. Three kinds of estrogens (estrone (E1), bisphenol A (BPA), and hexestrol (DES)) which are molecules with weak SERS signals were targeted in the hotspots by CB[8] to further improve the sensitivity and selectivity of SERS. It was demonstrated that CB[8] can link gold nanoparticles together through carbonyl groups. In addition, the host-guest interaction of CB[8] and estrogens was proved from the nuclear magnetic resonance hydrogen and infrared spectra. In the presence of CB[8], the SERS intensities of E1, BPA, and DES were increased to 19-fold, 74-fold, and 4-fold, respectively, and the LOD is 3.75 µM, 1.19 µM, and 8.26 µM, respectively. Furthermore, the proposed SERS method was applied to actual milk sample analysis with recoveries of E1 (85.0 ~ 112.8%), BPA (83.0 ~ 103.7%), and DES (62.6 ~ 132.0%). It is expected that the proposed signal enlarging strategy can be applied to other analytes after further development.
Collapse
Affiliation(s)
- Yuanjie Teng
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China.
| | - Xin Li
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China
| | - Yingxin Chen
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China
| | - Pei Xu
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China
| | - Zaifa Pan
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China
| | - Kang Shao
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China
| | - Nan Sun
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China.
| |
Collapse
|
5
|
Emissive‐Dye/Cucurbit[n]uril‐Based Fluorescence Probes for Sensing Applications. ChemistrySelect 2023. [DOI: 10.1002/slct.202204833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
|
6
|
Krämer J, Grimm LM, Zhong C, Hirtz M, Biedermann F. A supramolecular cucurbit[8]uril-based rotaxane chemosensor for the optical tryptophan detection in human serum and urine. Nat Commun 2023; 14:518. [PMID: 36720875 PMCID: PMC9889744 DOI: 10.1038/s41467-023-36057-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 01/13/2023] [Indexed: 02/02/2023] Open
Abstract
Sensing small biomolecules in biofluids remains challenging for many optical chemosensors based on supramolecular host-guest interactions due to adverse interplays with salts, proteins, and other biofluid components. Instead of following the established strategy of developing alternative synthetic binders with improved affinities and selectivity, we report a molecular engineering approach that addresses this biofluid challenge. Here we introduce a cucurbit[8]uril-based rotaxane chemosensor feasible for sensing the health-relevant biomarker tryptophan at physiologically relevant concentrations, even in protein- and lipid-containing human blood serum and urine. Moreover, this chemosensor enables emission-based high-throughput screening in a microwell plate format and can be used for label-free enzymatic reaction monitoring and chirality sensing. Printed sensor chips with surface-immobilized rotaxane-microarrays are used for fluorescence microscopy imaging of tryptophan. Our system overcomes the limitations of current supramolecular host-guest chemosensors and will foster future applications of supramolecular sensors for molecular diagnostics.
Collapse
Affiliation(s)
- Joana Krämer
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Laura M Grimm
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Chunting Zhong
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.,Karlsruhe Nano Micro Facility (KNMFi), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Michael Hirtz
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany. .,Karlsruhe Nano Micro Facility (KNMFi), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
| | - Frank Biedermann
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
| |
Collapse
|
7
|
Huang SZ, Tang Q, Wei KN, Yang RP, Tao Z, Huang Y, Xiao X. A colorimetric supramolecular sensor array based on charge-transfer complexes for multiplex aniline and phenolic pollutants detection. Anal Chim Acta 2022; 1233:340504. [DOI: 10.1016/j.aca.2022.340504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 09/24/2022] [Accepted: 10/07/2022] [Indexed: 11/01/2022]
|
8
|
Wei KN, Song GX, Huang SZ, Tang Q, Hu JH, Tao Z, Huang Y. Lab-on-a-Molecule Probe: Multitarget Detection of Five Aromatic Pesticides Using a Supramolecular Probe under Single Wavelength Excitation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:5784-5793. [PMID: 35506583 DOI: 10.1021/acs.jafc.2c00655] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In order to prevent and control the effects of pesticide residues on human health and the ecological environment, the rapid, highly sensitive, and selective detection of multiple pesticide residues has become an urgent problem to be solved. Herein, a lab-on-a-molecule probe based on a host-guest complex (ThT@Q[8] probe) has been developed to simultaneously analyze multiple aromatic pesticides under single wavelength excitation, such as fuberidazole, thiabendazole, carbendazim, thidiazuron, and tricyclazole. The fluorescence titration spectra of the ThT@Q[8] probe with the five pesticides mentioned above showed that the fluorescence intensity exhibited a good linear correlation with the pesticide concentration and the limit of detection was as low as 10-7 M. Because the ThT@Q[8] probe exhibits diverse fluorescence color changes to the five pesticides studied under a 365 nm ultraviolet lamp, we fabricated a single probe used to detect multiple analytes in the RGB triple channel by extracting the RGB variations. Principal component analysis and linear discriminant analysis proved that the ThT@Q[8] probe can recognize and distinguish five pesticides and can be applied at different concentrations. In real samples, the ThT@Q[8] probe recognized and distinguished five pesticides in tap water and Huaxi River water. The 1H NMR spectra results proved that a charge-transfer complex of ThT and pesticides in the Q[8] cavity may be formed. Moreover, we selected a test strip as a carrier to detect pesticides. The results indicate it can be used to quickly and conveniently detect different pesticides due to the rapid color change. Besides, the ThT@Q[8] probe has good cell permeability and can be used to detect pesticide residues in living cells. This work has laid the foundation for the qualitative and quantitative multitarget detection of pesticide residues.
Collapse
Affiliation(s)
- Kai-Ni Wei
- Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China
| | - Gui-Xian Song
- ShenQi Ethnic Medicine College of Guizhou Medical University, Guiyang 550025, China
| | - Shu-Zhen Huang
- Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China
| | - Qing Tang
- Department College of Tobacco Science, Guizhou University, Guiyang 550025, China
| | - Jian-Hang Hu
- Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China
| | - Zhu Tao
- Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China
| | - Ying Huang
- Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China
- The Engineering and Research Center for Southwest Bio-Pharmaceutical Resources of National Education Ministry of China, Guizhou University, Guiyang 550025, China
| |
Collapse
|
9
|
Neira I, Peinador C, García MD. CB[7]- and CB[8]-Based [2]-(Pseudo)rotaxanes with Triphenylphosphonium-Capped Threads: Serendipitous Discovery of a New High-Affinity Binding Motif. Org Lett 2022; 24:4491-4495. [PMID: 35514222 PMCID: PMC9251766 DOI: 10.1021/acs.orglett.2c01028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
![]()
The synthesis of
new triphenylphosphonium-capped cucurbit[7]uril
(CB[7])- and cucurbit[8]uril (CB[8])-based [2]rotaxanes was achieved
by a simultaneous threading-capping strategy. While the use of CB[7]
produced the designed [2]rotaxane, attempts to obtain the CB[8] analogue
were unsuccessful due to the unexpected strong interaction found between
the host and the phosphonium caps leading to pseudo-heteroternary
host–guest complexes. This unusual binding motif has been extensively
studied experimentally, with results in good agreement with those
obtained by dispersion-corrected DFT methods.
Collapse
Affiliation(s)
- Iago Neira
- Departamento de Química and Centro de Investigaciones Científicas Avanzadas (CICA). Facultad de Ciencias, Universidade da Coruña, 15071 A Coruña, Spain
| | - Carlos Peinador
- Departamento de Química and Centro de Investigaciones Científicas Avanzadas (CICA). Facultad de Ciencias, Universidade da Coruña, 15071 A Coruña, Spain
| | - Marcos D García
- Departamento de Química and Centro de Investigaciones Científicas Avanzadas (CICA). Facultad de Ciencias, Universidade da Coruña, 15071 A Coruña, Spain
| |
Collapse
|
10
|
Bi-directional feedback controlled transience in Cucurbituril based tandem nanozyme. J Colloid Interface Sci 2022; 614:172-180. [DOI: 10.1016/j.jcis.2022.01.092] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 01/06/2022] [Accepted: 01/15/2022] [Indexed: 02/02/2023]
|
11
|
Eckdahl CT, Ou C, Padgaonkar S, Hersam MC, Weiss EA, Kalow JA. Back electron transfer rates determine the photoreactivity of donor-acceptor stilbene complexes in a macrocyclic host. Org Biomol Chem 2022; 20:6201-6210. [PMID: 35419576 DOI: 10.1039/d2ob00472k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Host-guest 2 : 1 complexation of photoreactive alkene guests improves the selectivity of [2 + 2] photodimerizations by templating alkene orientation prior to irradiation. Host-guest chemistry can also provide 1 : 1 : 1 complexes through the inclusion of electronically complementary donor and acceptor guests, but the photoreactivity of such complexes has not been investigated. We imagined that such complexes could enable selective cross-[2 + 2] photocycloadditions between donor and acceptor stilbenes. In pursuit of this strategy, we investigated a series of stilbenes and found 1 : 1 : 1 complexes with cucurbit[8]uril that exhibited charge-transfer (CT) absorption bands in the visible and near-IR regions. Irradiation of the CT band of an azastilbene, 4,4'-stilbenedicarboxylate, and cucurbit[8]uril ternary complex led to a selective cross-[2 + 2] photocycloaddition, while other substrate pairs exhibited no productive chemistry upon CT excitation. Using transient absorption spectroscopy, we were able to understand the variable photoreactivity of different stilbene donor-acceptor complexes. We found that back electron transfer following CT excitation of the photoreactive complex is positioned deep in the Marcus inverted region due to electrostatic stabilization of the ground state, allowing [2 + 2] to effectively compete with this relaxation pathway. Control reactions revealed that the cucurbit[8]uril host not only serves to template the reaction from the ground state, but also protects the long-lived radical ions formed by CT from side reactions. This protective role of the host suggests that donor-acceptor host-guest ternary complexes could be used to improve existing CT-initiated photochemistry or access new reactivity.
Collapse
Affiliation(s)
| | - Carrie Ou
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
| | - Suyog Padgaonkar
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
| | - Mark C Hersam
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA. .,Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Emily A Weiss
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA. .,Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Julia A Kalow
- Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
| |
Collapse
|
12
|
Nilam M, Hennig A. Enzyme assays with supramolecular chemosensors - the label-free approach. RSC Adv 2022; 12:10725-10748. [PMID: 35425010 PMCID: PMC8984408 DOI: 10.1039/d1ra08617k] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 03/30/2022] [Indexed: 12/20/2022] Open
Abstract
Enzyme activity measurements are essential for many research areas, e.g., for the identification of inhibitors in drug discovery, in bioengineering of enzyme mutants for biotechnological applications, or in bioanalytical chemistry as parts of biosensors. In particular in high-throughput screening (HTS), sensitive optical detection is most preferred and numerous absorption and fluorescence spectroscopy-based enzyme assays have been developed, which most frequently require time-consuming fluorescent labelling that may interfere with biological recognition. The use of supramolecular chemosensors, which can specifically signal analytes with fluorescence-based read-out methods, affords an attractive and label-free alternative to more established enzyme assays. We provide herein a comprehensive review that summarizes the current state-of-the-art of supramolecular enzyme assays ranging from early examples with covalent chemosensors to the most recent applications of supramolecular tandem enzyme assays, which utilize common and often commercially available combinations of macrocyclic host molecules (e.g. cyclodextrins, calixarenes, and cucurbiturils) and fluorescent dyes as self-assembled reporter pairs for assaying enzyme activity.
Collapse
Affiliation(s)
- Mohamed Nilam
- Department of Biology/Chemistry, Center for Cellular Nanoanalytics (CellNanOs), Universität Osnabrück Barbarastr. 7 D-49076 Osnabrück Germany
| | - Andreas Hennig
- Department of Biology/Chemistry, Center for Cellular Nanoanalytics (CellNanOs), Universität Osnabrück Barbarastr. 7 D-49076 Osnabrück Germany
| |
Collapse
|
13
|
Nie H, Wei Z, Ni XL, Liu Y. Assembly and Applications of Macrocyclic-Confinement-Derived Supramolecular Organic Luminescent Emissions from Cucurbiturils. Chem Rev 2022; 122:9032-9077. [PMID: 35312308 DOI: 10.1021/acs.chemrev.1c01050] [Citation(s) in RCA: 89] [Impact Index Per Article: 44.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Cucurbit[n]urils (Q[n]s or CB[n]s), as a classical of artificial organic macrocyclic hosts, were found to have excellent advantages in the fabricating of tunable and smart organic luminescent materials in aqueous media and the solid state with high emitting efficiency under the rigid pumpkin-shaped structure-derived macrocyclic-confinement effect in recent years. This review aims to give a systematically up-to-date overview of the Q[n]-based supramolecular organic luminescent emissions from the confined spaces triggered host-guest complexes, including the assembly fashions and the mechanisms of the macrocycle-based luminescent complexes, as well as their applications. Finally, challenges and outlook are provided. Since this class of Q[n]-based supramolecular organic luminescent emissions, which have essentially derived from the cavity-dependent confinement effect and the resulting assembly fashions, emerged only a few years ago, we hope this review will provide valuable information for the further development of macrocycle-based light-emitting materials and other related research fields.
Collapse
Affiliation(s)
- Haigen Nie
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine (Ministry of Educational of China), Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province, Hunan Normal University, Changsha, Hunan 410081, China
| | - Zhen Wei
- College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
| | - Xin-Long Ni
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine (Ministry of Educational of China), Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province, Hunan Normal University, Changsha, Hunan 410081, China.,Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Guizhou University, Guiyang 550025, China
| | - Yu Liu
- College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
| |
Collapse
|
14
|
Yu H, Li J, Li S, Liu Y, Jackson NE, Moore JS, Schroeder CM. Efficient Intermolecular Charge Transport in π-Stacked Pyridinium Dimers Using Cucurbit[8]uril Supramolecular Complexes. J Am Chem Soc 2022; 144:3162-3173. [PMID: 35148096 DOI: 10.1021/jacs.1c12741] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Intermolecular charge transport through π-conjugated molecules plays an essential role in biochemical redox processes and energy storage applications. In this work, we observe highly efficient intermolecular charge transport upon dimerization of pyridinium molecules in the cavity of a synthetic host (cucurbit[8]uril, CB[8]). Stable, homoternary complexes are formed between pyridinium molecules and CB[8] with high binding affinity, resulting in an offset stacked geometry of two pyridiniums inside the host cavity. The charge transport properties of free and dimerized pyridiniums are characterized using a scanning tunneling microscope-break junction (STM-BJ) technique. Our results show that π-stacked pyridinium dimers exhibit comparable molecular conductance to isolated, single pyridinium molecules, despite a longer transport pathway and a switch from intra- to intermolecular charge transport. Control experiments using a CB[8] homologue (cucurbit[7]uril, CB[7]) show that the synthetic host primarily serves to facilitate dimer formation and plays a minimal role on molecular conductance. Molecular modeling using density functional theory (DFT) reveals that pyridinium molecules are planarized upon dimerization inside the host cavity, which facilitates charge transport. In addition, the π-stacked pyridinium dimers possess large intermolecular LUMO-LUMO couplings, leading to enhanced intermolecular charge transport. Overall, this work demonstrates that supramolecular assembly can be used to control intermolecular charge transport in π-stacked molecules.
Collapse
Affiliation(s)
| | - Jialing Li
- Joint Center for Energy Storage Research, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States
| | | | | | | | - Jeffrey S Moore
- Joint Center for Energy Storage Research, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States
| | - Charles M Schroeder
- Joint Center for Energy Storage Research, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States
| |
Collapse
|
15
|
Krämer J, Kang R, Grimm LM, De Cola L, Picchetti P, Biedermann F. Molecular Probes, Chemosensors, and Nanosensors for Optical Detection of Biorelevant Molecules and Ions in Aqueous Media and Biofluids. Chem Rev 2022; 122:3459-3636. [PMID: 34995461 PMCID: PMC8832467 DOI: 10.1021/acs.chemrev.1c00746] [Citation(s) in RCA: 123] [Impact Index Per Article: 61.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Indexed: 02/08/2023]
Abstract
Synthetic molecular probes, chemosensors, and nanosensors used in combination with innovative assay protocols hold great potential for the development of robust, low-cost, and fast-responding sensors that are applicable in biofluids (urine, blood, and saliva). Particularly, the development of sensors for metabolites, neurotransmitters, drugs, and inorganic ions is highly desirable due to a lack of suitable biosensors. In addition, the monitoring and analysis of metabolic and signaling networks in cells and organisms by optical probes and chemosensors is becoming increasingly important in molecular biology and medicine. Thus, new perspectives for personalized diagnostics, theranostics, and biochemical/medical research will be unlocked when standing limitations of artificial binders and receptors are overcome. In this review, we survey synthetic sensing systems that have promising (future) application potential for the detection of small molecules, cations, and anions in aqueous media and biofluids. Special attention was given to sensing systems that provide a readily measurable optical signal through dynamic covalent chemistry, supramolecular host-guest interactions, or nanoparticles featuring plasmonic effects. This review shall also enable the reader to evaluate the current performance of molecular probes, chemosensors, and nanosensors in terms of sensitivity and selectivity with respect to practical requirement, and thereby inspiring new ideas for the development of further advanced systems.
Collapse
Affiliation(s)
- Joana Krämer
- Institute
of Nanotechnology, Karlsruhe Institute of
Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Rui Kang
- Institute
of Nanotechnology, Karlsruhe Institute of
Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Laura M. Grimm
- Institute
of Nanotechnology, Karlsruhe Institute of
Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Luisa De Cola
- Institute
of Nanotechnology, Karlsruhe Institute of
Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- Dipartimento
DISFARM, University of Milano, via Camillo Golgi 19, 20133 Milano, Italy
- Department
of Molecular Biochemistry and Pharmacology, Instituto di Ricerche Farmacologiche Mario Negri, IRCCS, 20156 Milano, Italy
| | - Pierre Picchetti
- Institute
of Nanotechnology, Karlsruhe Institute of
Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Frank Biedermann
- Institute
of Nanotechnology, Karlsruhe Institute of
Technology (KIT), Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| |
Collapse
|
16
|
Zhang LP, Liu CZ, Liu M, Lu S, Yu SB, Qi QY, Yang GY, Li X, Yang B, Li ZT. CB[10]-driven self-assembly of a homotrimer from a symmetric organic dye: tunable multicolor fluorescence and higher solid-state stability than that of a CB[8]-included homodimer. Org Chem Front 2022. [DOI: 10.1039/d2qo01438f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A symmetric organic dye can form a highly stable homotrimer in the cavity of CB[10], which exhibits unique multicolour fluorescence different from that of the single molecule or its dimer.
Collapse
Affiliation(s)
- Le-Ping Zhang
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Chuan-Zhi Liu
- School of Chemistry and Chemical Engineering, Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Ming Liu
- School of Chemistry and Chemical Engineering, Guizhou University, Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province, Department of Chemistry, Guiyang 550025, China
| | - Shuai Lu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518055, China
| | - Shang-Bo Yu
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Qiao-Yan Qi
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Guan-Yu Yang
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Xiaopeng Li
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518055, China
| | - Bo Yang
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Zhan-Ting Li
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
- Department of Chemistry, Fudan University, 2205 Songhu Road, Shanghai 200438, China
| |
Collapse
|
17
|
Sayed M, Pal H. An overview from simple host-guest systems to progressively complex supramolecular assemblies. Phys Chem Chem Phys 2021; 23:26085-26107. [PMID: 34787121 DOI: 10.1039/d1cp03556h] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Supramolecular chemistry involving macrocyclic hosts is a highly interdisciplinary and fast-growing research field in chemistry, biochemistry, and materials science. Host-guest based supramolecular assemblies, as constructed through non-covalent interactions, are highly dynamic in nature, and can be tuned easily using their responses to various external stimuli, providing a convenient approach to achieve excellent functional materials. Macrocyclic hosts, particularly cyclodextrins, cucurbit[n]urils, and calix[n]arenes, which have unique features like possessing hydrophobic cavities of different sizes, along with hydrophilic external surfaces, which are also amenable towards easy derivatizations, are versatile cavitands or host molecules to encapsulate diverse guest molecules to form stable host-guest complexes with many unique structures and properties. Interestingly, host-guest complexes possessing amphiphilic properties can easily lead to the formation of various advanced supramolecular assemblies, like pseudorotaxanes, rotaxanes, polyrotaxanes, supramolecular polymers, micelles, vesicles, supramolecular nanostructures, and so on. Moreover, these supramolecular assemblies, with varied morphologies and responsiveness towards external stimuli, have immense potential for applications in nanotechnology, materials science, biosensors, drug delivery, analytical chemistry and biomedical sciences. In this perspective, we present a stimulating overview, discussing simple host-guest systems to complex supramolecular assemblies in a systematic manner, aiming to encourage future researchers in this fascinating area of supramolecular chemistry to develop advanced supramolecular materials with superior functionalities, for their deployment in diverse applied areas.
Collapse
Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India. .,Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
| | - Haridas Pal
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India.,Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
| |
Collapse
|
18
|
Liu H, Lin M, Cui Y, Gan W, Sun J, Li B, Zhao Y. Single-crystal structures of cucurbituril-based supramolecular host-guest complexes for bioimaging. Chem Commun (Camb) 2021; 57:10190-10193. [PMID: 34519729 DOI: 10.1039/d1cc04823f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Two single-crystal structures of cucurbit[n]uril mediated supramolecular complexes were obtained in which [1+3] and [2+3] self-assembly modes are adopted due to the different sizes of cucurbit[7]uril and cucurbit[8]uril. An obvious red-shift in absorption and emission was observed compared to the guest molecule itself which makes them good biolabels.
Collapse
Affiliation(s)
- Hui Liu
- College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China.
| | - Min Lin
- College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China.
| | - Yu Cui
- College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China.
| | - Weijin Gan
- College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China.
| | - Jing Sun
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
| | - Bo Li
- Department of Cardiology, Zibo Central Hospital, Shandong University, Zibo 255000, P. R. China.
| | - Yingjie Zhao
- College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China.
| |
Collapse
|
19
|
Brady KG, Liu B, Li X, Isaacs L. Self Assembled Cages with Mechanically Interlocked Cucurbiturils. Supramol Chem 2021; 33:8-32. [PMID: 34366642 DOI: 10.1080/10610278.2021.1908546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
We report preparation of (bis)aniline ligand 4 which contains a central viologen binding domain and its subcomponent self-assembly with aldehyde 5 and Fe(OTf)2 in CH3CN to yield tetrahedral assembly 6. Complexation of ligand 4 with CB[7] in the form of CB[7]•4•2PF6 allows the preparation of assembly 7 which contains an average of 1.95 (range 1-3) mechanically interlocked CB[7] units. Assemblies 6 and 7 are hydrolytically unstable in water due to their imine linkages. Redesign of our system with water stable 2,2'-bipyridine end groups was realized in the form of ligands 11 and 16 which also contain a central viologen binding domain. Self-assembly of 11 with Fe(NTf2)2 gave tetrahedral MOP 12 as evidenced by 1H NMR, DOSY, and mass spectrometric analysis. In contrast, isomeric ligand 16 underwent self-assembly with Fe(OTf)2 to give cubic assembly 17. Precomplexation of ligands 11 and 16 with CB[7] gave the acetonitrile soluble CB[7]•11•2PF6 and CB[7]•16•2PF6 complexes. Self-assembly of CB[7]•11•2PF6 with Fe(OTf)2 gave tetrahedron 13 which contains on average 1.8 mechanically interlocked CB[7] units as determined by 1H NMR, DOSY, and ESI-MS analysis. Self-assembly of CB[7]•16•2PF6 with Fe(OTf)2 gave cube 13 which contains 6.59 mechanically interlocked CB[7] units as determined by 1H NMR and DOSY measurements.
Collapse
Affiliation(s)
- Kimberly G Brady
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Bingqing Liu
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Xiaopeng Li
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Lyle Isaacs
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| |
Collapse
|
20
|
Shan P, Lin R, Liu M, Tao Z, Xiao X, Liu J. Recognition of glycine by cucurbit[5]uril and cucurbit[6]uril: A comparative study of exo- and endo-binding. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2021.02.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
21
|
Sahm CD, Mates-Torres E, Eliasson N, Sokołowski K, Wagner A, Dalle KE, Huang Z, Scherman OA, Hammarström L, García-Melchor M, Reisner E. Imidazolium-modification enhances photocatalytic CO 2 reduction on ZnSe quantum dots. Chem Sci 2021; 12:9078-9087. [PMID: 34276937 PMCID: PMC8261709 DOI: 10.1039/d1sc01310f] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 05/17/2021] [Indexed: 12/22/2022] Open
Abstract
Colloidal photocatalysts can utilize solar light for the conversion of CO2 to carbon-based fuels, but controlling the product selectivity for CO2 reduction remains challenging, in particular in aqueous solution. Here, we present an organic surface modification strategy to tune the product selectivity of colloidal ZnSe quantum dots (QDs) towards photocatalytic CO2 reduction even in the absence of transition metal co-catalysts. Besides H2, imidazolium-modified ZnSe QDs evolve up to 2.4 mmolCO gZnSe -1 (TONQD > 370) after 10 h of visible light irradiation (AM 1.5G, λ > 400 nm) in aqueous ascorbate solution with a CO-selectivity of up to 20%. This represents a four-fold increase in CO-formation yield and 13-fold increase in CO-selectivity compared to non-functionalized ZnSe QDs. The binding of the thiolated imidazolium ligand to the QD surface is characterized quantitatively using 1H-NMR spectroscopy and isothermal titration calorimetry, revealing that a subset of 12 to 17 ligands interacts strongly with the QDs. Transient absorption spectroscopy reveals an influence of the ligand on the intrinsic charge carrier dynamics through passivating Zn surface sites. Density functional theory calculations indicate that the imidazolium capping ligand plays a key role in stabilizing the surface-bound *CO2 - intermediate, increasing the yield and selectivity toward CO production. Overall, this work unveils a powerful tool of using organic capping ligands to modify the chemical environment on colloids, thus enabling control over the product selectivity within photocatalyzed CO2 reduction.
Collapse
Affiliation(s)
- Constantin D Sahm
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Rd Cambridge CB2 1EW UK http://www-reisner.ch.cam.ac.uk
| | - Eric Mates-Torres
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin, College Green Dublin 2 Ireland
| | - Nora Eliasson
- Department of Chemistry, Ångström Laboratory, Uppsala University Box 523 751 20 Uppsala Sweden
| | - Kamil Sokołowski
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Rd Cambridge CB2 1EW UK http://www-reisner.ch.cam.ac.uk.,Melville Laboratory for Polymer Synthesis, Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Rd Cambridge CB2 1EW UK.,Institute of Physical Chemistry, Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Andreas Wagner
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Rd Cambridge CB2 1EW UK http://www-reisner.ch.cam.ac.uk
| | - Kristian E Dalle
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Rd Cambridge CB2 1EW UK http://www-reisner.ch.cam.ac.uk
| | - Zehuan Huang
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Rd Cambridge CB2 1EW UK http://www-reisner.ch.cam.ac.uk.,Melville Laboratory for Polymer Synthesis, Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Rd Cambridge CB2 1EW UK
| | - Oren A Scherman
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Rd Cambridge CB2 1EW UK http://www-reisner.ch.cam.ac.uk.,Melville Laboratory for Polymer Synthesis, Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Rd Cambridge CB2 1EW UK
| | - Leif Hammarström
- Department of Chemistry, Ångström Laboratory, Uppsala University Box 523 751 20 Uppsala Sweden
| | - Max García-Melchor
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin, College Green Dublin 2 Ireland
| | - Erwin Reisner
- Yusuf Hamied Department of Chemistry, University of Cambridge Lensfield Rd Cambridge CB2 1EW UK http://www-reisner.ch.cam.ac.uk
| |
Collapse
|
22
|
Tang B, Xu W, Xu JF, Zhang X. Transforming a Fluorochrome to an Efficient Photocatalyst for Oxidative Hydroxylation: A Supramolecular Dimerization Strategy Based on Host-Enhanced Charge Transfer. Angew Chem Int Ed Engl 2021; 60:9384-9388. [PMID: 33587309 DOI: 10.1002/anie.202100185] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 02/08/2021] [Indexed: 12/17/2022]
Abstract
The development of non-covalent synthetic strategy to fabricate efficient photocatalysts is of great importance in theranostic and organic materials. Herein, a fluorochrome N,N'-dimethyl 2,5-bis(4-pyridinium)thiazolo[5,4-d]thiazolediiodide (MPT) was transformed into an efficient photocatalyst through supramolecular dimerization in the cavity of cucurbit[8]uril (CB[8]). The host-enhanced charge transfer interaction within the supramolecular dimer 2MPT-CB[8] dramatically promoted intersystem crossing to produce triplet. In addition, the staggered conformation of 2MPT-CB[8] facilitated the energy transfer and electron transfer of the triplet. As a result, 2MPT-CB[8] could serve as a high-efficiency photocatalyst for the oxidative hydroxylation of arylboronic acids. This supramolecular dimerization strategy enriches the supramolecular engineering of functional π-systems. It is anticipated that this strategy can be extended to fabricate various π-systems with tailor-made functions.
Collapse
Affiliation(s)
- Bohan Tang
- Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Weiquan Xu
- Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Jiang-Fei Xu
- Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Xi Zhang
- Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| |
Collapse
|
23
|
Tang B, Xu W, Xu J, Zhang X. Transforming a Fluorochrome to an Efficient Photocatalyst for Oxidative Hydroxylation: A Supramolecular Dimerization Strategy Based on Host‐Enhanced Charge Transfer. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100185] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Bohan Tang
- Key Laboratory of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China
| | - Weiquan Xu
- Key Laboratory of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China
| | - Jiang‐Fei Xu
- Key Laboratory of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China
| | - Xi Zhang
- Key Laboratory of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China
| |
Collapse
|
24
|
Lutz F, Lorenzo-Parodi N, Schmidt TC, Niemeyer J. Heteroternary cucurbit[8]uril complexes as supramolecular scaffolds for self-assembled bifunctional photoredoxcatalysts. Chem Commun (Camb) 2021; 57:2887-2890. [PMID: 33606856 DOI: 10.1039/d0cc08025j] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The self-assembly of bifunctional photoredoxcatalysts is reported. A series of photosensitizers and water-reducing catalysts were functionalized with viologen- and naphthol-units, respectively. Subsequent formation of the heteroternary cucurbit[8]uril-viologen-naphthol complexes was used for the constitution of bifunctional photoredoxcatalysts for hydrogen generation.
Collapse
Affiliation(s)
- Fabian Lutz
- Faculty of Chemistry, Organic Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstrasse. 7, Essen 45141, Germany.
| | | | | | | |
Collapse
|
25
|
Boz E, Stein M. Accurate Receptor-Ligand Binding Free Energies from Fast QM Conformational Chemical Space Sampling. Int J Mol Sci 2021; 22:3078. [PMID: 33802920 PMCID: PMC8002627 DOI: 10.3390/ijms22063078] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 03/13/2021] [Accepted: 03/15/2021] [Indexed: 12/22/2022] Open
Abstract
Small molecule receptor-binding is dominated by weak, non-covalent interactions such as van-der-Waals hydrogen bonding or electrostatics. Calculating these non-covalent ligand-receptor interactions is a challenge to computational means in terms of accuracy and efficacy since the ligand may bind in a number of thermally accessible conformations. The conformational rotamer ensemble sampling tool (CREST) uses an iterative scheme to efficiently sample the conformational space and calculates energies using the semi-empirical 'Geometry, Frequency, Noncovalent, eXtended Tight Binding' (GFN2-xTB) method. This combined approach is applied to blind predictions of the modes and free energies of binding for a set of 10 drug molecule ligands to the cucurbit[n]urils CB[8] receptor from the recent 'Statistical Assessment of the Modeling of Proteins and Ligands' (SAMPL) challenge including morphine, hydromorphine, cocaine, fentanyl, and ketamine. For each system, the conformational space was sufficiently sampled for the free ligand and the ligand-receptor complexes using the quantum chemical Hamiltonian. A multitude of structures makes up the final conformer-rotamer ensemble, for which then free energies of binding are calculated. For those large and complex molecules, the results are in good agreement with experimental values with a mean error of 3 kcal/mol. The GFN2-xTB energies of binding are validated by advanced density functional theory calculations and found to be in good agreement. The efficacy of the automated QM sampling workflow allows the extension towards other complex molecular interaction scenarios.
Collapse
Affiliation(s)
| | - Matthias Stein
- Max Planck Institute for Dynamics of Complex Technical Systems, Molecular Simulations and Design Group, 39106 Magdeburg, Germany;
| |
Collapse
|
26
|
Liu J, Lambert H, Zhang YW, Lee TC. Rapid Estimation of Binding Constants for Cucurbit[8]uril Ternary Complexes Using Electrochemistry. Anal Chem 2021; 93:4223-4230. [PMID: 33595296 PMCID: PMC8023530 DOI: 10.1021/acs.analchem.0c04887] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Supramolecular complexes
are of fundamental interests in biomedicines
and adaptive materials, and thus facile methods to determine their
binding affinity show usefulness in the design of novel drugs and
materials. Herein, we report a novel approach to estimate the binding
constants KG2 of cucurbit[8]uril-methyl
viologen-based ternary complexes (CB8-MV2+-G2) using electrochemistry,
achieving high precision (±0.03) and practical accuracy (±0.32)
in logKG2 and short measurement time (<10
min). In particular, we have uncovered a linear correlation (R2 > 0.8) between the reduction potential
of
CB8-MV2+-G2 ternary complexes and their reported binding
constants from isothermal titration calorimetry, which allow a calibration
curve to be plotted based on 25 sample complexes. Mechanistic investigation
using experimental and computational approaches reveals that this
correlation stems from the dynamic host-guest exchange events occurring
after the electron transfer step. Binding constants of unknown ternary
complexes, where G2 = hydrocarbons, were estimated, illustrating potential
applications for sparsely soluble second guests.
Collapse
Affiliation(s)
- Jia Liu
- Institute for Materials Discovery, University College London (UCL), Bloomsbury, London WC1E 7JE, United Kingdom.,Department of Chemistry, University College London (UCL), 20 Gordon Street, London, WC1H 0AJ, United Kingdom
| | - Hugues Lambert
- Institute for Materials Discovery, University College London (UCL), Bloomsbury, London WC1E 7JE, United Kingdom.,Department of Chemistry, University College London (UCL), 20 Gordon Street, London, WC1H 0AJ, United Kingdom.,Institute of High Performance Computing, 1 Fusionopolis Way, 138632, Singapore
| | - Yong-Wei Zhang
- Institute of High Performance Computing, 1 Fusionopolis Way, 138632, Singapore
| | - Tung-Chun Lee
- Institute for Materials Discovery, University College London (UCL), Bloomsbury, London WC1E 7JE, United Kingdom.,Department of Chemistry, University College London (UCL), 20 Gordon Street, London, WC1H 0AJ, United Kingdom
| |
Collapse
|
27
|
Escobar L, Ballester P. Molecular Recognition in Water Using Macrocyclic Synthetic Receptors. Chem Rev 2021; 121:2445-2514. [PMID: 33472000 DOI: 10.1021/acs.chemrev.0c00522] [Citation(s) in RCA: 123] [Impact Index Per Article: 41.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Molecular recognition in water using macrocyclic synthetic receptors constitutes a vibrant and timely research area of supramolecular chemistry. Pioneering examples on the topic date back to the 1980s. The investigated model systems and the results derived from them are key for furthering our understanding of the remarkable properties exhibited by proteins: high binding affinity, superior binding selectivity, and extreme catalytic performance. Dissecting the different effects contributing to the proteins' properties is severely limited owing to its complex nature. Molecular recognition in water is also involved in other appreciated areas such as self-assembly, drug discovery, and supramolecular catalysis. The development of all these research areas entails a deep understanding of the molecular recognition events occurring in aqueous media. In this review, we cover the past three decades of molecular recognition studies of neutral and charged, polar and nonpolar organic substrates and ions using selected artificial receptors soluble in water. We briefly discuss the intermolecular forces involved in the reversible binding of the substrates, as well as the hydrophobic and Hofmeister effects operating in aqueous solution. We examine, from an interdisciplinary perspective, the design and development of effective water-soluble synthetic receptors based on cyclic, oligo-cyclic, and concave-shaped architectures. We also include selected examples of self-assembled water-soluble synthetic receptors. The catalytic performance of some of the presented receptors is also described. The latter process also deals with molecular recognition and energetic stabilization, but instead of binding ground-state species, the targets become elusive counterparts: transition states and other high-energy intermediates.
Collapse
Affiliation(s)
- Luis Escobar
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, 43007 Tarragona, Spain.,Departament de Química Analítica i Química Orgánica, Universitat Rovira i Virgili, c/Marcel·lí Domingo 1, 43007 Tarragona, Spain
| | - Pablo Ballester
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, 43007 Tarragona, Spain.,ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
| |
Collapse
|
28
|
Page CG, Cooper SJ, DeHovitz JS, Oblinsky DG, Biegasiewicz KF, Antropow AH, Armbrust KW, Ellis JM, Hamann LG, Horn EJ, Oberg KM, Scholes GD, Hyster TK. Quaternary Charge-Transfer Complex Enables Photoenzymatic Intermolecular Hydroalkylation of Olefins. J Am Chem Soc 2021; 143:97-102. [PMID: 33369395 PMCID: PMC7832516 DOI: 10.1021/jacs.0c11462] [Citation(s) in RCA: 67] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Intermolecular C-C bond-forming reactions are underdeveloped transformations in the field of biocatalysis. Here we report a photoenzymatic intermolecular hydroalkylation of olefins catalyzed by flavin-dependent 'ene'-reductases. Radical initiation occurs via photoexcitation of a rare high-order enzyme-templated charge-transfer complex that forms between an alkene, α-chloroamide, and flavin hydroquinone. This unique mechanism ensures that radical formation only occurs when both substrates are present within the protein active site. This active site can control the radical terminating hydrogen atom transfer, enabling the synthesis of enantioenriched γ-stereogenic amides. This work highlights the potential for photoenzymatic catalysis to enable new biocatalytic transformations via previously unknown electron transfer mechanisms.
Collapse
Affiliation(s)
- Claire G. Page
- Department of Chemistry, Princeton University, Princeton,
New Jersey, 08544 USA
| | - Simon J. Cooper
- Department of Chemistry, Princeton University, Princeton,
New Jersey, 08544 USA
| | - Jacob S. DeHovitz
- Department of Chemistry, Princeton University, Princeton,
New Jersey, 08544 USA
| | - Daniel G. Oblinsky
- Department of Chemistry, Princeton University, Princeton,
New Jersey, 08544 USA
| | | | - Alyssa H. Antropow
- Bristol Myers Squibb, 200 Cambridge Park Drive,
Suite 3000, Cambridge, Massachusetts, 02140 USA
| | - Kurt W. Armbrust
- Bristol Myers Squibb, 200 Cambridge Park Drive,
Suite 3000, Cambridge, Massachusetts, 02140 USA
| | - J. Michael Ellis
- Bristol Myers Squibb, 200 Cambridge Park Drive,
Suite 3000, Cambridge, Massachusetts, 02140 USA
| | - Lawrence G. Hamann
- Takeda Pharmaceuticals, 30 Landsdowne Street,
Cambridge, Massachusetts, 02139, USA
| | - Evan J. Horn
- Bristol Myers Squibb, 10300 Campus Point Drive,
Suite 100, San Diego, California, 92121 USA
| | - Kevin M. Oberg
- Bristol Myers Squibb, 10300 Campus Point Drive,
Suite 100, San Diego, California, 92121 USA
| | - Gregory D. Scholes
- Department of Chemistry, Princeton University, Princeton,
New Jersey, 08544 USA
| | - Todd K. Hyster
- Department of Chemistry, Princeton University, Princeton,
New Jersey, 08544 USA
| |
Collapse
|
29
|
Thangavel A. Inclusion and Charge Transfer Interaction of a Multi-Redox Active 1,3,5-Triazine Derivative by Cucurbit[7,8]urils. J Org Chem 2021; 86:1178-1182. [PMID: 33327719 DOI: 10.1021/acs.joc.0c02198] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The redox active 1,3,5-triazine derivative (MPT) was used as a guest to study host-guest, charge transfer interaction with CB[7,8] in water. The multi-redox active MPT undergoes four chemically and electrochemically reversible one electron redox states in organic media, but in water, the fourth redox state shows an unstable nature. As a guest, the host-guest interaction of MPT was studied with two macrocyclic cucurbit[7,8]uril (CB[7,8]) hosts in water; resulting supramolecular complexes were characterized by NMR, ESI-MS, UV-vis, ITC, and cyclic voltammetric studies.
Collapse
Affiliation(s)
- Arumugam Thangavel
- Department of Chemistry and Biochemistry, California State University Dominguez Hills, Carson, California 90747, United States
| |
Collapse
|
30
|
Tang B, Zhao J, Xu J, Zhang X. Cucurbit[
n
]urils for Supramolecular Catalysis. Chemistry 2020; 26:15446-15460. [DOI: 10.1002/chem.202003897] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Revised: 09/08/2020] [Indexed: 12/16/2022]
Affiliation(s)
- Bohan Tang
- Key Laboratory of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 P. R. China
| | - Jiantao Zhao
- Key Laboratory of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 P. R. China
| | - Jiang‐Fei Xu
- Key Laboratory of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 P. R. China
| | - Xi Zhang
- Key Laboratory of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 P. R. China
| |
Collapse
|
31
|
Tu K, Zou L, Yang C, Su Y, Lu C, Zhu J, Zhang F, Ke C, Zhuang X. Ionic Polyimide Derived Porous Carbon Nanosheets as High-Efficiency Oxygen Reduction Catalysts for Zn-Air Batteries. Chemistry 2020; 26:6525-6534. [PMID: 31788872 DOI: 10.1002/chem.201904769] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Revised: 11/28/2019] [Indexed: 11/11/2022]
Abstract
Two-dimensional (2D) porous carbon nanosheets (2DPCs) have attracted great attention for their good porosity and long-distance conductivity. Factors such as templates, precursors, and carbonization-activation methods, directly determine their performance. However, rational design and preparation of porous carbon materials with controlled 2D morphology and heteroatom dopants remains a challenge. Therefore, an ionic polyimide with both sp2 - and sp3 -hybridized nitrogen atoms was prepared as a precursor for fabricating N-doped hexagonal porous carbon nanosheets through a hard-template approach. Because of the large surface area and efficient charge-mass transport, the resulting activated 2D porous carbon nanosheets (2DPCs-a) displayed promising electrocatalytic properties for oxygen reduction reaction (ORR) in alkaline and acidic media, such as ultralow half-wave potential (0.83 vs. 0.84 V of Pt/C) and superior limiting current density (5.42 vs. 5.14 mA cm-2 of Pt/C). As air cathodes in Zn-air batteries, the as-developed 2DPCs-a exhibited long stability and high capacity (up to 614 mA h g-1 ), which are both higher than those of commercial Pt/C. This work provides a convenient method for controllable and scalable 2DPCs fabrication as well as new opportunities to develop high-efficiency electrocatalysts for ORR and Zn-air batteries.
Collapse
Affiliation(s)
- Kejun Tu
- School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.,The Meso-Entropy Matter Lab, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Lingyi Zou
- The Meso-Entropy Matter Lab, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Chongqing Yang
- The Meso-Entropy Matter Lab, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Yuezeng Su
- School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Chenbao Lu
- The Meso-Entropy Matter Lab, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Jinhui Zhu
- The Meso-Entropy Matter Lab, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Fan Zhang
- The Meso-Entropy Matter Lab, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Changchun Ke
- School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Xiaodong Zhuang
- The Meso-Entropy Matter Lab, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.,Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, School of Materials Science and Engineering, Changzhou University, Changzhou, 213164, P. R. China
| |
Collapse
|
32
|
Assaf KI, Abed Alfattah H, Eftaiha AF, Bardaweel SK, Alnajjar MA, Alsoubani FA, Qaroush AK, El-Barghouthi MI, Nau WM. Encapsulation of ionic liquids inside cucurbiturils. Org Biomol Chem 2020; 18:2120-2128. [PMID: 32129437 DOI: 10.1039/d0ob00001a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cucurbit[n]urils (CBn, n = 6-8) serve as molecular receptors for imidazolium-based ionic liquids (ILs) in aqueous solution. The amphiphilic nature of 1-alkyl-3-methylimidazolium guests (Cnmim), with a cationic imidazolium residue and a hydrophobic alkyl chain, enabled their complexation with CBn through a combination of the hydrophobic effect and ion-dipole interactions. 1H NMR experiments revealed that the cavity of CBn can host the hydrophobic chain of the ILs, while one of the carbonyl rims served as a docking site for the imidazolium ring. The structure of the complexes was further analyzed by molecular dynamics (MD) simulations, which indicated that the cavity of CB6 can accommodate up to 5 carbon atoms, while the larger cavity of CB7 and CB8 can encapsulate longer alkyl chains in folded conformations. Isothermal titration calorimetry (ITC) experiments provided up to micromolar affinity of ILs to CBn in aqueous solution, which was independently quantified by indicator displacement titrations.
Collapse
Affiliation(s)
- Khaleel I Assaf
- Department of Chemistry, Al-Balqa Applied University, Al-Salt 19117, Jordan.
| | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Uchikura T, Oshima M, Kawasaki M, Takahashi K, Iwasawa N. Supramolecular Photocatalysis by Utilizing the Host-Guest Charge-Transfer Interaction: Visible-Light-Induced Generation of Triplet Anthracenes for [4+2] Cycloaddition Reactions. Angew Chem Int Ed Engl 2020; 59:7403-7408. [PMID: 32043287 DOI: 10.1002/anie.201916732] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Indexed: 01/22/2023]
Abstract
Supramolecular photocatalysis via charge-transfer excitation of a host-guest complex was developed by use of the macrocyclic boronic ester [2+2]BTH-F containing highly electron-deficient difluorobenzothiadiazole moieties. In the presence of a catalytic amount of [2+2]BTH-F , the triplet excited state of anthracene was generated from the charge-transfer excited state of anthracene@[2+2]BTH-F by visible-light irradiation, and cycloaddition of the excited anthracene with several dienes and alkenes proceeded in a [4+2] manner in high yields.
Collapse
Affiliation(s)
- Tatsuhiro Uchikura
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan.,Present address: Department of Chemistry, Faculty of Science, Gakushuin University, Mejiro, Toshima-ku, Tokyo, 171-8588, Japan
| | - Mari Oshima
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Minami Kawasaki
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Kohei Takahashi
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Nobuharu Iwasawa
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| |
Collapse
|
34
|
Uchikura T, Oshima M, Kawasaki M, Takahashi K, Iwasawa N. Supramolecular Photocatalysis by Utilizing the Host–Guest Charge‐Transfer Interaction: Visible‐Light‐Induced Generation of Triplet Anthracenes for [4+2] Cycloaddition Reactions. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201916732] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tatsuhiro Uchikura
- Department of ChemistryTokyo Institute of Technology, O-okayama, Meguro-ku Tokyo 152-8551 Japan
- Present address: Department of ChemistryFaculty of ScienceGakushuin University, Mejiro, Toshima-ku Tokyo 171-8588 Japan
| | - Mari Oshima
- Department of ChemistryTokyo Institute of Technology, O-okayama, Meguro-ku Tokyo 152-8551 Japan
| | - Minami Kawasaki
- Department of ChemistryTokyo Institute of Technology, O-okayama, Meguro-ku Tokyo 152-8551 Japan
| | - Kohei Takahashi
- Department of ChemistryTokyo Institute of Technology, O-okayama, Meguro-ku Tokyo 152-8551 Japan
| | - Nobuharu Iwasawa
- Department of ChemistryTokyo Institute of Technology, O-okayama, Meguro-ku Tokyo 152-8551 Japan
| |
Collapse
|
35
|
Wu G, Clarke DE, Wu C, Scherman OA. Oligopeptide-CB[8] complexation with switchable binding pathways. Org Biomol Chem 2020; 17:3514-3520. [PMID: 30892363 DOI: 10.1039/c9ob00592g] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Host-guest complexes exhibiting a 1 : 1 binding stoichiometry need not consist of a single host and guest. A series of oligopeptides, which were previously reported to have abnormally high binding enthalpies were investigated to deduce whether they exist as a 2 : 2 quaternary or a 1 : 1 binary complex with cucurbit[8]uril (CB[8]). Through a systematic study of the sequence-specific binding pathways of peptide-CB[8] association, a phenylalanine-leucine dipeptide was found to be capable of switching from a 1 : 1 stoichiometric complex to a 2 : 1 complex. By studying the differences in size-based diffusion properties of these two binding modes, the presence of a 1 : 1 pairwise inclusion complex was verified for the regime where CB[8] is in excess. Findings in this study can be utilised to 'customise' the precise CB[8]-oligopeptide self-assembly pathway, acting as a useful toolbox in the design of supramolecular systems.
Collapse
Affiliation(s)
- Guanglu Wu
- Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
| | | | | | | |
Collapse
|
36
|
Barrow SJ, Assaf KI, Palma A, Nau WM, Scherman OA. Preferential binding of unsaturated hydrocarbons in aryl-bisimidazolium·cucurbit[8]uril complexes furbishes evidence for small-molecule π-π interactions. Chem Sci 2019; 10:10240-10246. [PMID: 32110310 PMCID: PMC7006508 DOI: 10.1039/c9sc03282g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 10/07/2019] [Indexed: 01/26/2023] Open
Abstract
Whilst cucurbit[n]urils (CBn) have been utilized in gas encapsulation, only the smaller CBn (n = 5 and 6) have utility given their small cavity size. In this work, we demonstrate that the large cavity of CB8 can be tailored for gaseous and volatile hydrocarbon encapsulation by restricting its internal cavity size with auxiliary aryl-bisimidazolium (Bis, aryl = phenyl, naphthyl, and biphenyl) guests. The binding constants for light hydrocarbons (C ≤ 4) are similar to those measured with CB6, while larger values are obtained with Bis·CB8 for larger guests. A clear propensity for higher affinities of alkenes relative to alkanes is observed, most pronounced with the largest delocalized naphthalene residue in the auxiliary Bis guest, which provides unique evidence for sizable small-molecule π-π interactions.
Collapse
Affiliation(s)
- Steven J Barrow
- Melville Laboratory for Polymer Synthesis , Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , CB2 1EW , UK .
| | - Khaleel I Assaf
- Department of Life Sciences and Chemistry , Jacobs University Bremen , Campus Ring 1 , D-28759 Bremen , Germany .
| | - Aniello Palma
- Melville Laboratory for Polymer Synthesis , Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , CB2 1EW , UK .
| | - Werner M Nau
- Department of Life Sciences and Chemistry , Jacobs University Bremen , Campus Ring 1 , D-28759 Bremen , Germany .
| | - Oren A Scherman
- Melville Laboratory for Polymer Synthesis , Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge , CB2 1EW , UK .
| |
Collapse
|
37
|
|
38
|
Wu G, Szabó I, Rosta E, Scherman OA. Cucurbit[8]uril-mediated pseudo[2,3]rotaxanes. Chem Commun (Camb) 2019; 55:13227-13230. [PMID: 31631210 DOI: 10.1039/c9cc07144j] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Pseudo[2,3]rotaxanes have been successfully fabricated by the complexation of cucurbit[8]uril (CB[8]) macrocycles with extended viologen derivatives. Two design rules enable the incorporation of a third CB[8] onto a recently reported pseudo[2,2]rotaxane. Incorporation of a third macrocycle confines the dimeric stacking of chromophores into specific alignment, leading to effective electron-delocalisation along their long molecular axis.
Collapse
Affiliation(s)
- Guanglu Wu
- Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
| | - István Szabó
- Department of Chemistry, King's College London, 7 Trinity Street, London, SE1 1DB, UK
| | - Edina Rosta
- Department of Chemistry, King's College London, 7 Trinity Street, London, SE1 1DB, UK
| | - Oren A Scherman
- Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
| |
Collapse
|
39
|
Sun W, Duan T, Cao Y, Li H. An Injectable Self-Healing Protein Hydrogel with Multiple Dissipation Modes and Tunable Dynamic Response. Biomacromolecules 2019; 20:4199-4207. [PMID: 31553595 DOI: 10.1021/acs.biomac.9b01114] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Hydrogels with dynamic mechanical properties are of special interest in the field of tissue engineering and drug delivery. However, it remains challenging to tailor the dynamic mechanical response of hydrogels to simultaneously meet diverse application needs. Here, we report a hetero-coiled-coil complex cross-linked protein hydrogel exhibiting unusual multiple energy dissipation modes and tunable dynamic response. Such unique features confer on the hydrogel responsiveness to mechanical stimuli in a broad range of frequencies. Therefore, the hydrogels are injectable due to their shearing-thinning properties at low shear rates of 0.8 rad s-1 and can fully recover their mechanical properties within a few seconds due to the intrinsic fast dynamics of the cross-linkers. Moreover, the dynamic response of these hydrogels can be fine-tuned by the temperature and the hydrogel network structures. We anticipate that these hydrogels are promising candidates for delivering therapeutic drugs, biological molecules, and cells in a broad spectrum of biomedical applications.
Collapse
Affiliation(s)
- Wenxu Sun
- Department of Chemistry , University of British Columbia , Vancouver , BC V6T 1Z1 , Canada.,School of Physics , Nanjing University , Nanjing 210093 , P. R. China
| | - Tianyu Duan
- Department of Chemistry , University of British Columbia , Vancouver , BC V6T 1Z1 , Canada
| | - Yi Cao
- School of Physics , Nanjing University , Nanjing 210093 , P. R. China
| | - Hongbin Li
- Department of Chemistry , University of British Columbia , Vancouver , BC V6T 1Z1 , Canada
| |
Collapse
|
40
|
Das G, Sharma SK, Prakasam T, Gándara F, Mathew R, Alkhatib N, Saleh N, Pasricha R, Olsen JC, Baias M, Kirmizialtin S, Jagannathan R, Trabolsi A. A polyrotaxanated covalent organic network based on viologen and cucurbit[7]uril. Commun Chem 2019. [DOI: 10.1038/s42004-019-0207-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
|
41
|
Delawder AO, Natraj A, Colley ND, Saak T, Greene AF, Barnes JC. Synthesis, self-assembly, and photomechanical actuator performance of a sequence-defined polyviologen crosslinker. Supramol Chem 2019. [DOI: 10.1080/10610278.2019.1632453] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
| | - Anusree Natraj
- Department of Chemistry, Washington University, St. Louis, MO, USA
| | - Nathan D. Colley
- Department of Chemistry, Washington University, St. Louis, MO, USA
| | - Tiana Saak
- Department of Chemistry, Washington University, St. Louis, MO, USA
| | | | | |
Collapse
|
42
|
He L, Liu S, Chen L, Dai X, Li J, Zhang M, Ma F, Zhang C, Yang Z, Zhou R, Chai Z, Wang S. Mechanism unravelling for ultrafast and selective 99TcO 4 - uptake by a radiation-resistant cationic covalent organic framework: a combined radiological experiment and molecular dynamics simulation study. Chem Sci 2019; 10:4293-4305. [PMID: 31057756 PMCID: PMC6471554 DOI: 10.1039/c9sc00172g] [Citation(s) in RCA: 114] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Accepted: 02/19/2019] [Indexed: 12/11/2022] Open
Abstract
Separation of TcO4– by a cationic covalent organic framework is achieved for the first time, showing advantages of extremely fast sorption kinetics, ultrahigh uptake capacity, good anion-exchange selectivity, and excellent radiation resistance.
99Tc is one of the most problematic fission products in the nuclear fuel cycle owing to its large inventory in used nuclear fuel, long half-life, potential radiation hazard, high environmental mobility of its major species 99TcO4–, and its redox-active nature. Ideally, 99TcO4– should be removed at the first stage, when the used fuel rods are dissolved in highly concentrated nitric acid solution, which can substantially reduce its interference with the solvent extraction process through catalytic redox reactions with the key actinides and diminish the chance of discharge into the environment as the volatile species during the waste vitrification process. However, this task cannot be achieved by any of the reported anion-scavenging materials including traditional polymeric anion-exchange resins, inorganic cationic framework materials, and recently developed cationic metal–organic framework materials, because they either are not stable under the extreme conditions of the combined high acidity and strong radiation field or do not possess the required uptake selectivity towards 99TcO4– in the presence of a huge excess of competing anions such as NO3– and SO42–. Herein, we present the first study of 99TcO4– removal under extreme conditions by a two-dimensional conjugated cationic covalent organic framework material, SCU-COF-1. This material exhibits ultrahigh acid stability, great resistance towards both large-dose β and γ irradiation and unprecedented 99TcO4– uptake capabilities including extremely fast sorption kinetics (sorption equilibrium can be reached within 1 min), ultrahigh uptake capacity (702.4 mg g–1 for the surrogate ReO4– at a slightly elevated temperature), and good anion-exchange selectivity towards 99TcO4–. These excellent features endow SCU-COF-1 with the practical capabilities of separating 99TcO4– from both simulant highly acidic fuel reprocessing solutions (3 M nitric acid) and low-activity waste streams at the US legacy nuclear site. The anion-exchange mechanism and the 99TcO4– uptake selectivity are further demonstrated and clearly visualized by the molecular dynamics simulation investigations.
Collapse
Affiliation(s)
- Linwei He
- State Key Laboratory of Radiation Medicine and Protection , School of Radiation Medicine and Protection , Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions , Soochow University , Suzhou 215123 , China . ;
| | - Shengtang Liu
- State Key Laboratory of Radiation Medicine and Protection , School of Radiation Medicine and Protection , Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions , Soochow University , Suzhou 215123 , China . ;
| | - Long Chen
- State Key Laboratory of Radiation Medicine and Protection , School of Radiation Medicine and Protection , Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions , Soochow University , Suzhou 215123 , China . ;
| | - Xing Dai
- State Key Laboratory of Radiation Medicine and Protection , School of Radiation Medicine and Protection , Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions , Soochow University , Suzhou 215123 , China . ;
| | - Jie Li
- State Key Laboratory of Radiation Medicine and Protection , School of Radiation Medicine and Protection , Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions , Soochow University , Suzhou 215123 , China . ;
| | - Mingxing Zhang
- State Key Laboratory of Radiation Medicine and Protection , School of Radiation Medicine and Protection , Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions , Soochow University , Suzhou 215123 , China . ; .,Shanghai Institute of Applied Physics , Chinese Academy of Sciences , No. 2019 Jialuo Rd., Jiading Dist. , Shanghai , 201800 , China
| | - Fuyin Ma
- State Key Laboratory of Radiation Medicine and Protection , School of Radiation Medicine and Protection , Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions , Soochow University , Suzhou 215123 , China . ;
| | - Chao Zhang
- School of Materials Science and Engineering , Anhui University of Science and Technology , Huainan 232001 , China
| | - Zaixing Yang
- State Key Laboratory of Radiation Medicine and Protection , School of Radiation Medicine and Protection , Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions , Soochow University , Suzhou 215123 , China . ;
| | - Ruhong Zhou
- State Key Laboratory of Radiation Medicine and Protection , School of Radiation Medicine and Protection , Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions , Soochow University , Suzhou 215123 , China . ;
| | - Zhifang Chai
- State Key Laboratory of Radiation Medicine and Protection , School of Radiation Medicine and Protection , Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions , Soochow University , Suzhou 215123 , China . ;
| | - Shuao Wang
- State Key Laboratory of Radiation Medicine and Protection , School of Radiation Medicine and Protection , Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions , Soochow University , Suzhou 215123 , China . ;
| |
Collapse
|
43
|
Zhang B, Dong Y, Li J, Yu Y, Li C, Cao L. Pseudo[
n
,
m
]rotaxanes of Cucurbit[7/8]uril and Viologen‐Naphthalene Derivative: A Precise Definition of Rotaxane. CHINESE J CHEM 2019. [DOI: 10.1002/cjoc.201800562] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Beilin Zhang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University Xi'an Shaanxi 710069 China
| | - Yunhong Dong
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University Xi'an Shaanxi 710069 China
- National Demonstration Center for Experimental Chemistry Education, College of Chemistry and Materials Science, Northwest University Xi'an Shaanxi 710069 China
| | - Jie Li
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University Xi'an Shaanxi 710069 China
| | - Yang Yu
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University Xi'an Shaanxi 710069 China
| | - Chenyang Li
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University Xi'an Shaanxi 710069 China
| | - Liping Cao
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University Xi'an Shaanxi 710069 China
| |
Collapse
|
44
|
Jeevan AK, Gopidas KR. Hierarchical Self‐Assembly of Pyrene‐Linked Cyclodextrin and Adamantane‐Linked Naphthalene Diimide System: A Case of Inclusion‐Binding‐Assisted Charge‐Transfer Interaction. ChemistrySelect 2019. [DOI: 10.1002/slct.201803166] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Athira Kanakkattussery Jeevan
- Photosciences and Photonics SectionChemical Sciences and Technology DivisionCSIR-National Institute for Interdisciplinary Science and Technology Trivandrum 695 019 India
- Academy of Scientific and Innovative Research (AcSIR) New Delhi 110001 India
| | - Karical Raman Gopidas
- Photosciences and Photonics SectionChemical Sciences and Technology DivisionCSIR-National Institute for Interdisciplinary Science and Technology Trivandrum 695 019 India
- Academy of Scientific and Innovative Research (AcSIR) New Delhi 110001 India
| |
Collapse
|
45
|
Oughli AA, Vélez M, Birrell JA, Schuhmann W, Lubitz W, Plumeré N, Rüdiger O. Viologen-modified electrodes for protection of hydrogenases from high potential inactivation while performing H 2 oxidation at low overpotential. Dalton Trans 2018; 47:10685-10691. [PMID: 29881850 PMCID: PMC6083823 DOI: 10.1039/c8dt00955d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In this work we present a viologen-modified electrode providing protection for hydrogenases against high potential inactivation.
In this work we present a viologen-modified electrode providing protection for hydrogenases against high potential inactivation. Hydrogenases, including O2-tolerant classes, suffer from reversible inactivation upon applying high potentials, which limits their use in biofuel cells to certain conditions. Our previously reported protection strategy based on the integration of hydrogenase into redox matrices enabled the use of these biocatalysts in biofuel cells even under anode limiting conditions. However, mediated catalysis required application of an overpotential to drive the reaction, and this translates into a power loss in a biofuel cell. In the present work, the enzyme is adsorbed on top of a covalently-attached viologen layer which leads to mixed, direct and mediated, electron transfer processes; at low overpotentials, the direct electron transfer process generates a catalytic current, while the mediated electron transfer through the viologens at higher potentials generates a redox buffer that prevents oxidative inactivation of the enzyme. Consequently, the enzyme starts the catalysis at no overpotential with viologen self-activated protection at high potentials.
Collapse
Affiliation(s)
- Alaa A Oughli
- Max-Planck-Institut for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany.
| | | | | | | | | | | | | |
Collapse
|
46
|
Pazos E, Novo P, Peinador C, Kaifer AE, García MD. Cucurbit[8]uril (CB[8])‐Based Supramolecular Switches. Angew Chem Int Ed Engl 2018; 58:403-416. [DOI: 10.1002/anie.201806575] [Citation(s) in RCA: 96] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Indexed: 01/05/2023]
Affiliation(s)
- Elena Pazos
- Departamento de Química Facultade de Ciencias and Centro de Investigacións Científicas Avanzadas (CICA) Universidade da Coruña 15071, A Coruña Spain
| | - Paula Novo
- Departamento de Química Facultade de Ciencias and Centro de Investigacións Científicas Avanzadas (CICA) Universidade da Coruña 15071, A Coruña Spain
| | - Carlos Peinador
- Departamento de Química Facultade de Ciencias and Centro de Investigacións Científicas Avanzadas (CICA) Universidade da Coruña 15071, A Coruña Spain
| | - Angel E. Kaifer
- Department of Chemistry University of Miami Coral Gables FL 33124 USA
| | - Marcos D. García
- Departamento de Química Facultade de Ciencias and Centro de Investigacións Científicas Avanzadas (CICA) Universidade da Coruña 15071, A Coruña Spain
| |
Collapse
|
47
|
Pazos E, Novo P, Peinador C, Kaifer AE, García MD. Supramolekulare Schalter auf der Basis von Cucurbit[8]uril (CB[8]). Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806575] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Elena Pazos
- Departamento de Química Facultade de Ciencias and Centro de Investigacións Científicas Avanzadas (CICA) Universidade da Coruña 15071, A Coruña Spanien
| | - Paula Novo
- Departamento de Química Facultade de Ciencias and Centro de Investigacións Científicas Avanzadas (CICA) Universidade da Coruña 15071, A Coruña Spanien
| | - Carlos Peinador
- Departamento de Química Facultade de Ciencias and Centro de Investigacións Científicas Avanzadas (CICA) Universidade da Coruña 15071, A Coruña Spanien
| | - Angel E. Kaifer
- Department of Chemistry University of Miami Coral Gables FL 33124 USA
| | - Marcos D. García
- Departamento de Química Facultade de Ciencias and Centro de Investigacións Científicas Avanzadas (CICA) Universidade da Coruña 15071, A Coruña Spanien
| |
Collapse
|
48
|
Eken Y, Patel P, Díaz T, Jones MR, Wilson AK. SAMPL6 host-guest challenge: binding free energies via a multistep approach. J Comput Aided Mol Des 2018; 32:1097-1115. [PMID: 30225724 DOI: 10.1007/s10822-018-0159-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Accepted: 08/31/2018] [Indexed: 12/14/2022]
Abstract
In this effort in the SAMPL6 host-guest binding challenge, a combination of molecular dynamics and quantum mechanical methods were used to blindly predict the host-guest binding free energies of a series of cucurbit[8]uril (CB8), octa-acid (OA), and tetramethyl octa-acid (TEMOA) hosts bound to various guest molecules in aqueous solution. Poses for host-guest systems were generated via molecular dynamics (MD) simulations and clustering analyses. The binding free energies for the structures obtained via cluster analyses of MD trajectories were calculated using the MMPBSA method and density functional theory (DFT) with the inclusion of Grimme's dispersion correction, an implicit solvation model to model the aqueous solution, and the resolution-of-the-identity (RI) approximation (MMPBSA, RI-B3PW91-D3, and RI-B3PW91, respectively). Among these three methods tested, the results for OA and TEMOA systems showed MMPBSA and RI-B3PW91-D3 methods can be used to qualitatively rank binding energies of small molecules with an overbinding by 7 and 37 kcal/mol respectively, and RI-B3PW91 gave the poorest quality results, indicating the importance of dispersion correction for the binding free energy calculations. Due to the complexity of the CB8 systems, all of the methods tested show poor correlation with the experimental results. Other quantum mechanical approaches used for the calculation of binding free energies included DFT without the RI approximation, utilizing truncated basis sets to reduce the computational cost (memory, disk space, CPU time), and a corrected dielectric constant to account for ionic strength within the implicit solvation model.
Collapse
Affiliation(s)
- Yiğitcan Eken
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Prajay Patel
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Thomas Díaz
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Michael R Jones
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Angela K Wilson
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA.
| |
Collapse
|
49
|
Papadourakis M, Bosisio S, Michel J. Blinded predictions of standard binding free energies: lessons learned from the SAMPL6 challenge. J Comput Aided Mol Des 2018; 32:1047-1058. [PMID: 30159717 DOI: 10.1007/s10822-018-0154-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Accepted: 08/24/2018] [Indexed: 10/28/2022]
Abstract
In the context of the SAMPL6 challenges, series of blinded predictions of standard binding free energies were made with the SOMD software for a dataset of 27 host-guest systems featuring two octa-acids hosts (OA and TEMOA) and a cucurbituril ring (CB8) host. Three different models were used, ModelA computes the free energy of binding based on a double annihilation technique; ModelB additionally takes into account long-range dispersion and standard state corrections; ModelC additionally introduces an empirical correction term derived from a regression analysis of SAMPL5 predictions previously made with SOMD. The performance of each model was evaluated with two different setups; buffer explicitly matches the ionic strength from the binding assays, whereas no-buffer merely neutralizes the host-guest net charge with counter-ions. ModelC/no-buffer shows the lowest mean-unsigned error for the overall dataset (MUE 1.29 < 1.39 < 1.50 kcal mol-1, 95% CI), while explicit modelling of the buffer improves significantly results for the CB8 host only. Correlation with experimental data ranges from excellent for the host TEMOA (R2 0.91 < 0.94 < 0.96), to poor for CB8 (R2 0.04 < 0.12 < 0.23). Further investigations indicate a pronounced dependence of the binding free energies on the modelled ionic strength, and variable reproducibility of the binding free energies between different simulation packages.
Collapse
Affiliation(s)
- Michail Papadourakis
- EaStCHEM School of Chemistry, Joseph Black Building, King's Buildings, Edinburgh, EH9 3FJ, UK
| | - Stefano Bosisio
- EaStCHEM School of Chemistry, Joseph Black Building, King's Buildings, Edinburgh, EH9 3FJ, UK
| | - Julien Michel
- EaStCHEM School of Chemistry, Joseph Black Building, King's Buildings, Edinburgh, EH9 3FJ, UK.
| |
Collapse
|
50
|
Detailed potential of mean force studies on host-guest systems from the SAMPL6 challenge. J Comput Aided Mol Des 2018; 32:1013-1026. [PMID: 30143917 DOI: 10.1007/s10822-018-0153-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 08/11/2018] [Indexed: 12/14/2022]
Abstract
Accurately predicting receptor-ligand binding free energies is one of the holy grails of computational chemistry with many applications in chemistry and biology. Many successes have been reported, but issues relating to sampling and force field accuracy remain significant issues affecting our ability to reliably calculate binding free energies. In order to explore these issues in more detail we have examined a series of small host-guest complexes from the SAMPL6 blind challenge, namely octa-acids (OAs)-guest complexes and Curcurbit[8]uril (CB8)-guest complexes. Specifically, potential of mean force studies using umbrella sampling combined with the weighted histogram method were carried out on both systems with both known and unknown binding affinities. We find that using standard force fields and straightforward simulation protocols we are able to obtain satisfactory results, but that simply scaling our results allows us to significantly improve our predictive ability for the unknown test sets: the overall RMSD of the binding free energy versus experiment is reduced from 5.59 to 2.36 kcal/mol; for the CB8 test system, the RMSD goes from 8.04 to 3.51 kcal/mol, while for the OAs test system, the RSMD goes from 2.89 to 0.95 kcal/mol. The scaling approach was inspired by studies on structurally related known benchmark sets: by simply scaling, the RMSD was reduced from 6.23 to 1.19 kcal/mol and from 2.96 to 0.62 kcal/mol for the CB8 benchmark system and the OA benchmark system, respectively. We find this scaling procedure to correct absolute binding affinities to be highly effective especially when working across a "congeneric" series with similar charge states. It is less successful when applied to mixed ligands with varied charges and chemical characteristics, but improvement is still realized in the present case. This approach suggests that there are large systematic errors in absolute binding free energy calculations that can be straightforwardly accounted for using a scaling procedure. Random errors are still an issue, but near chemical accuracy can be obtained using the present strategy in select cases.
Collapse
|