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Bhattacharjee N, Gao X, Nathani A, Dobscha JR, Pink M, Ito T, Flood AH. Solvent Acts as the Referee in a Match-Up Between Charged and Preorganized Receptors. Chemistry 2023; 29:e202302339. [PMID: 37615829 DOI: 10.1002/chem.202302339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 08/21/2023] [Accepted: 08/22/2023] [Indexed: 08/25/2023]
Abstract
The prevalence of anion-cation contacts in biomolecular recognition under aqueous conditions suggests that ionic interactions should dominate the binding of anions in solvents across both high and low polarities. Investigations of this idea using titrations in low polarity solvents are impaired by interferences from ion pairing that prevent a clear picture of binding. To address this limitation and test the impact of ion-ion interactions across multiple solvents, we quantified chloride binding to a cationic receptor after accounting for ion pairing. In these studies, we created a chelate receptor using aryl-triazole CH donors and a quinolinium unit that directs its cationic methyl inside the binding pocket. In low-polarity dichloromethane, the 1 : 1 complex (log K1 : 1 ~ 7.3) is more stable than neutral chelates, but fortuitously comparable to a preorganized macrocycle (log K1 : 1 ~ 6.9). Polar acetonitrile and DMSO diminish stabilities of the charged receptor (log K1 : 1 ~ 3.7 and 1.9) but surprisingly 100-fold more than the macrocycle. While both receptors lose stability by dielectric screening of electrostatic stability, the cationic receptor also pays additional costs of organization. Thus even though the charged receptor has stronger binding in apolar solvents, the uncharged receptor has more anion affinity in polar solvents.
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Affiliation(s)
- Nabarupa Bhattacharjee
- Department of Chemistry, Indiana University Bloomington, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
| | - Xinfeng Gao
- Department of Chemistry, Indiana University Bloomington, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
| | - Akash Nathani
- Department of Chemistry, Kansas State University, 213 CBC Building, 1212 Mid-campus Dr North, Manhattan, KS 66506, USA
| | - James R Dobscha
- Department of Chemistry, Indiana University Bloomington, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
| | - Maren Pink
- Department of Chemistry, Indiana University Bloomington, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
| | - Takashi Ito
- Department of Chemistry, Kansas State University, 213 CBC Building, 1212 Mid-campus Dr North, Manhattan, KS 66506, USA
| | - Amar H Flood
- Department of Chemistry, Indiana University Bloomington, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
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2
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Li MH, Yang Z, Hui H, Yang B, Wang Y, Yang YW. Superstructure-Induced Hierarchical Assemblies for Nanoconfined Photocatalysis. Angew Chem Int Ed Engl 2023; 62:e202313358. [PMID: 37798254 DOI: 10.1002/anie.202313358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 10/02/2023] [Accepted: 10/05/2023] [Indexed: 10/07/2023]
Abstract
Most attempts to synthesize supramolecular nanosystems are limited to a single mechanism, often resulting in the formation of nanomaterials that lack diversity in properties. Herein, hierarchical assemblies with appropriate variety are fabricated in bulk via a superstructure-induced organic-inorganic hybrid strategy. The dynamic balance between substructures and superstructures is managed using covalent organic frameworks (COFs) and metal-organic frameworks (MOFs) as dual building blocks to regulate the performances of hierarchical assemblies. Significantly, the superstructures resulting from the controlled cascade between COFs and MOFs create highly active photocatalytic systems through multiple topologies. Our designed tandem photocatalysis can precisely and efficiently regulate the conversion rates of bioactive molecules (benzo[d]imidazoles) through competing redox pathways. Furthermore, benzo[d]imidazoles catalyzed by such supramolecular nanosystems can be isolated in yields ranging from 70 % to 93 % within tens of minutes. The multilayered structural states within the supramolecular systems demonstrate the importance of hierarchical assemblies in facilitating photocatalytic propagation and expanding the structural repertoire of supramolecular hybrids.
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Affiliation(s)
- Meng-Hao Li
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
| | - Zhiqiang Yang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
| | - Hui Hui
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
| | - Bing Yang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
| | - Yan Wang
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
| | - Ying-Wei Yang
- International Joint Research Laboratory of Nano-Micro Architecture Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
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3
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Morais ÁCB, Borges ID, Rodrigues JPM, Aguiar ASN, Dias LD, Camargo AJ, Martins JLR, Oliveira SS, Napolitano HB. Theoretical analysis of the effects of counterions on the supramolecular arrangement of sulfamethoxazole. J Mol Model 2022; 28:338. [PMID: 36181566 DOI: 10.1007/s00894-022-05300-x] [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: 05/27/2022] [Accepted: 08/29/2022] [Indexed: 10/06/2022]
Abstract
Active pharmaceutical ingredients are formulated as the salt form, aiming to modulate their physicochemical properties. In this regard, the optimization and choice of the salt former have a strong influence on toxicity, therapeutic efficiency, and bioavailability. Sulfamethoxazole (SMZ) salts with Na+, Cl-, and Br- counterions influence in the supramolecular arrangement as well as in their thermodynamic and kinetic parameters. Herein, we analyzed the interactions of the Na+, Cl-, and Br- counterions on the supramolecular arrangement of the sulfamethoxazole salts by Hirshfeld surfaces, fingerprint plots, and theoretical methods-quantum theory of atoms in molecules and natural bond orbitals. Moreover, we evaluated their electronic structure by density functional theory using calculation of the frontier molecular orbitals. Molecular electrostatic potential maps were also obtained to predict the interactions of the counterions along crystalline arrangements. We observed that the structures of [SMZ]+ and [SMZ]- ions differ slightly from the SMZ. The chemical reactivity indices show that the SMZ is kinetically more stable than its respective ions, while its anion is more polarizable, and its cation has a higher global electrophilicity index. The molecular electrostatic potential maps show high charge density in the sulfonyl group (nucleophilic region) and the heterocyclic amino group (electrophilic region). Although the molecular skeleton is identical among the three SMZ species and the presence of different counterions in the formation of the crystalline structure of the salts results in supramolecular arrangements with different patterns of intermolecular interactions, despite being very similar in terms of intensities.
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Affiliation(s)
- Álice C B Morais
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de Goiás, GO, Anápolis, Brazil.,Laboratório de Novos Materiais, Universidade Evangélica de Goiás, Anápolis, GO, Brazil
| | - Igor D Borges
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de Goiás, GO, Anápolis, Brazil.,Laboratório de Novos Materiais, Universidade Evangélica de Goiás, Anápolis, GO, Brazil
| | - João P M Rodrigues
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de Goiás, GO, Anápolis, Brazil
| | - Antônio S N Aguiar
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de Goiás, GO, Anápolis, Brazil
| | - Lucas D Dias
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de Goiás, GO, Anápolis, Brazil.,Laboratório de Novos Materiais, Universidade Evangélica de Goiás, Anápolis, GO, Brazil
| | - Ademir J Camargo
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de Goiás, GO, Anápolis, Brazil
| | - José L R Martins
- Laboratório de Novos Materiais, Universidade Evangélica de Goiás, Anápolis, GO, Brazil
| | - Solemar S Oliveira
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de Goiás, GO, Anápolis, Brazil.
| | - Hamilton B Napolitano
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de Goiás, GO, Anápolis, Brazil.,Laboratório de Novos Materiais, Universidade Evangélica de Goiás, Anápolis, GO, Brazil
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4
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Woźny M, Trzybiński D, Dąbrowa K, Narodowiec J, Woźniak K. Monosulfonated dibenzo-24-crown-8 and its properties. Org Biomol Chem 2022; 20:5308-5318. [PMID: 35730366 DOI: 10.1039/d2ob00851c] [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
In this paper, we describe a method for preparing a monosulfonated dibenzo-24-crown-8 ether, SDB24C8, by direct sulfonation of the parent crown (DB24C8). Since neutral DB24C8 readily interacts with cationic guests, permanently charged SDB24C8 is an advantageous candidate for future supramolecular applications. SDB24C8 can be isolated as a sulfonic acid to be used as it is or converted to a salt of choice. The crystallographic analysis provides the first known host-guest assembly with a DB24C8-based scaffold complexing hydronium and potassium cations. Supramolecular investigations of the interactions of this anionic macrocycle with alkali cations were also performed. According to the expectations, the introduction of the sulfonic group into the DB24C8 scaffold increases the affinities of the receptor. An unusual selectivity of SDB24C8 towards a sodium cation was also observed and further investigated with DFT calculations.
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Affiliation(s)
- M Woźny
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - D Trzybiński
- Biological and Chemical Research Centre, Chemistry Department, University of Warsaw, Żwirki i Wigury 101, 02-089 Warszawa, Poland
| | - K Dąbrowa
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - J Narodowiec
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - K Woźniak
- Biological and Chemical Research Centre, Chemistry Department, University of Warsaw, Żwirki i Wigury 101, 02-089 Warszawa, Poland
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5
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Schröder HV, Stadlmeier M, Wühr M, Link AJ. The Shuttling Cascade in Lasso Peptide Benenodin-1 is Controlled by Non-Covalent Interactions. Chemistry 2022; 28:e202103615. [PMID: 34797593 PMCID: PMC8792204 DOI: 10.1002/chem.202103615] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Indexed: 01/26/2023]
Abstract
The lasso peptide benenodin-1, a naturally occurring and bacterially produced [1]rotaxane, undergoes a reversible zip tie-like motion under heat activation, in which a peptidic wheel stepwise translates along a molecular thread in a cascade of "tail/loop pulling" equilibria. Conformational and structural analyses of four translational isomers, in solution and in the gas phase, reveal that the equilibrium distribution is controlled by mechanical and non-covalent forces within the lasso peptide. Furthermore, each dynamic pulling step is accompanied by a major restructuring of the intramolecular hydrogen bonding network between wheel and thread, which affects the peptide's physico-chemical properties.
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Affiliation(s)
- Hendrik V. Schröder
- Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08544
| | - Michael Stadlmeier
- Department of Molecular Biology and Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, NJ 08544
| | - Martin Wühr
- Department of Molecular Biology and Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, NJ 08544
| | - A. James Link
- Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08544,Department of Chemistry and Department of Molecular Biology, Princeton University, Princeton, NJ 08544
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6
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Dang LL, Li TT, Cui Z, Sui D, Ma LF, Jin GX. Selective construction and stability studies of a molecular trefoil knot and Solomon link. Dalton Trans 2021; 50:16984-16989. [PMID: 34612256 DOI: 10.1039/d1dt02755g] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Two novel compounds, a molecular trefoil knot and a Solomon link, were constructed successfully through the cooperation of multiple π-π stacking interactions. A reversible transformation between the trefoil knot and the corresponding [2 + 2] macrocycle could be achieved by solvent- and guest-induced effects. However, the Solomon link maintains its stability in different concentrations, solvents and guest molecules. Single-crystal X-ray crystallographic data, NMR spectroscopic experiments and ESI-MS support the synthesis and structural assignments. These synthesis methods open the door to the further development of smart materials, which will push the advancement of rational design of biomaterials.
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Affiliation(s)
- Li-Long Dang
- College of Chemistry and Chemical Engineering, Henan Province Function-Oriented Porous Materials Key Laboratory, Luoyang Normal University, Luoyang 471934, P. R. China.
| | - Ting-Ting Li
- College of Chemistry and Chemical Engineering, Henan Province Function-Oriented Porous Materials Key Laboratory, Luoyang Normal University, Luoyang 471934, P. R. China. .,College of Chemistry and Bioengineering (Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials), Guilin University of Technology, Guilin 541004, P. R. China
| | - Zheng Cui
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Laboratory of Molecular Engineering of Polymers, Department of Chemistry, Fudan University, Shanghai 200438, P. R. China.
| | - Dong Sui
- College of Chemistry and Chemical Engineering, Henan Province Function-Oriented Porous Materials Key Laboratory, Luoyang Normal University, Luoyang 471934, P. R. China.
| | - Lu-Fang Ma
- College of Chemistry and Chemical Engineering, Henan Province Function-Oriented Porous Materials Key Laboratory, Luoyang Normal University, Luoyang 471934, P. R. China.
| | - Guo-Xin Jin
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Laboratory of Molecular Engineering of Polymers, Department of Chemistry, Fudan University, Shanghai 200438, P. R. China.
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7
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Vetter AC, Gilheany DG, Nikitin K. Wittig Olefination Using Phosphonium Ion-Pair Reagents Incorporating an Endogenous Base. Org Lett 2021; 23:1457-1462. [PMID: 33529039 DOI: 10.1021/acs.orglett.1c00133] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Despite common perception, the use of strong bases in Wittig chemistry is utterly unnecessary: we report a series of novel ion-pair phosphonium carboxylate reagents which are essentially "storable ylides". These reagents are straightforwardly prepared in excellent yields, and their fluxional nature permits clean olefination of a broad range of aldehydes and even hemiacetals.
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Affiliation(s)
- Anna C Vetter
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Declan G Gilheany
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Kirill Nikitin
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
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8
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Singh AK, Rath SP. Intermacrocyclic Interactions upon Stepwise Oxidations in a Monometallic Porphyrin Dimer: Ring versus Metal‐Center Oxidations and Effect of Counter Anions. Chemistry 2020; 26:14405-14418. [DOI: 10.1002/chem.202002188] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 06/15/2020] [Indexed: 12/22/2022]
Affiliation(s)
- Akhil Kumar Singh
- Department of Chemistry Indian Institute of Technology Kanpur Kanpur 208016 India
| | - Sankar Prasad Rath
- Department of Chemistry Indian Institute of Technology Kanpur Kanpur 208016 India
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9
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Dang LL, Gao X, Lin YJ, Jin GX. Selective synthesis and structural transformation between a molecular ring-in-ring architecture and an abnormal trefoil knot. Chem Sci 2020; 11:8013-8019. [PMID: 34094170 PMCID: PMC8163296 DOI: 10.1039/d0sc02733b] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 07/15/2020] [Indexed: 11/21/2022] Open
Abstract
The synthesis of complicated supramolecular architectures and the study of their reversible structural transformations remains a fascinating challenge in the field of supramolecular chemistry. Herein, two types of novel coordination compounds, a non-intertwined ring-in-ring assembly and an abnormal trefoil knot were constructed from a strategically selected Cp*Rh building block and a semi-rigid N,N'-bis(4-pyridylmethyl)diphthalic diimide ligand via coordination-driven self-assembly. Remarkably, the reversible transformation between the abnormal trefoil knot and the ring-in-ring assembly or the corresponding tetranuclear macrocycle could be achieved by the synergistic effects of Ag+ ion coordination and alteration of the solvent. Single-crystal X-ray crystallographic data and NMR spectroscopic experiments support the structural assignments.
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Affiliation(s)
- Li-Long Dang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Laboratory of Molecular Engineering of Polymers, Fudan University Shanghai 200438 P. R. China
| | - Xiang Gao
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Laboratory of Molecular Engineering of Polymers, Fudan University Shanghai 200438 P. R. China
| | - Yue-Jian Lin
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Laboratory of Molecular Engineering of Polymers, Fudan University Shanghai 200438 P. R. China
| | - Guo-Xin Jin
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Laboratory of Molecular Engineering of Polymers, Fudan University Shanghai 200438 P. R. China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences Shanghai 200032 P. R. China
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10
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Garcia-Rio L, Basílio N, Francisco V. Counterion effect on sulfonatocalix[n]arene recognition. PURE APPL CHEM 2019. [DOI: 10.1515/pac-2019-0305] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Sulfonatocalixarenes, like other ionic receptors, possess counterions that can affect the molecular recognition process. In the present review it is shown that the competitive effect of the alkaline cations frequently used as counterions determines not only the magnitude of the external guest association constant, but also the stoichiometry of the complexes. Experimental evidences are shown about the interaction of the counterions with sulfonatocalixarene, allowing to quantify its association equilibrium constants. The counterions recognition will be a competitive process that must be taken into account when investigating the interaction of calixarenes with an external guests. When the external guest is a neutral molecule it will be possible to form ternary complexes where the counterion shows a competitive and cooperative effect. By increasing the size of the receptor, sulfonatocalix[6] and sulfonatocalix[8]arene, the complexity of the system is increased due to the formation of counterion complexes with stoichiometries 1:1 and 1:2. In the presence of an external guest, the formation of heteroternary complexes with 1:1:1 stoichiometries including a counterion and an organic cation will be possible.
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Affiliation(s)
- Luis Garcia-Rio
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Física , Universidad de Santiago , 15782 Santiago , Spain , Fax: +34 981595012
| | - Nuno Basílio
- Laboratório Associado para a Química Verde (LAQV), Rede de Química e Tecnologia (REQUIMTE), Departmento de Química, Faculdade de Ciências e Tecnologia , Universidade NOVA de Lisboa , 2829-516 Caparica , Portugal
| | - Vitor Francisco
- CNC – Center for Neurosciences and Cell Biology , University of Coimbra , 3004-517 Coimbra , Portugal
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11
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Singh MP, Tarai A, Baruah JB. Photo-physical properties of salts of a di-topic imidazole-tethered anthracene derivative in solid and solution. CrystEngComm 2019. [DOI: 10.1039/c9ce00791a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Combined effects of Dexter-quenching and protonation to change the photoluminescence of a di-topic anthracene–amine conjugate by nitrophenols and aromatic carboxylic acids in solid and solution are presented.
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Affiliation(s)
- Munendra Pal Singh
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati-781 039
- India
| | - Arup Tarai
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati-781 039
- India
| | - Jubaraj B. Baruah
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati-781 039
- India
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12
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Dhanwal V, Katoch A, Singh A, Chakraborty S, Faheem MM, Kaur G, Nayak D, Singh N, Goswami A, Kaur N. Self-assembled organic nanoparticles of benzimidazole analogue exhibit enhanced uptake in 3D tumor spheroids and oxidative stress induced cytotoxicity in breast cancer. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 97:467-478. [PMID: 30678934 DOI: 10.1016/j.msec.2018.12.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 11/15/2018] [Accepted: 12/11/2018] [Indexed: 12/30/2022]
Abstract
Organic nanoparticles (ONPs) possess great research interests for their promising effects in the enhancement of bioactivity including anticancer activity with less toxicity. The present study describes the preparation, characterization and biological evaluation of aqueous phase ONPs of potent 1,2-disubstituted benzimidazole derivative (BZ6) for anticancer activity. BZ6-ONPs were characterized through UV-absorption and fluorescence spectroscopic analysis for their photo-physical properties. DLS, TEM and SEM studies were carried out for morphological and structural analysis. Cytotoxicity determination on a panel of four different cancer cell lines (MCF-7, MiaPaca-2, HT-29 and HCT-116) revealed that the BZ6-ONPs show highest activity in human breast cancer MCF-7 cells. Surprisingly, the BZ6-ONPs were found to be non-toxic towards normal breast epithelial fR2 cells. Additionally, the FITC-ONPs showed enhanced uptake in 3D tumor spheroids of MCF-7 cells compared to the free FITC. BZ6-ONPs strongly halted cell proliferation and induced apoptosis, possibly through oxidative stress-mediated reactive oxygen species (ROS) generation and loss of mitochondrial membrane potential (MMP) in MCF-7 cells. Moreover, molecular mechanism-based studies revealed that BZ6-ONPs downregulated AKT/NF-κB/vimentin/survivin-mediated oncogenic signaling pathway promoting cell proliferation and malignancy. In a nutshell, BZ6-ONPs are therapeutically efficacious, which needs further development as a treatment option in human mammary gland carcinomas.
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Affiliation(s)
- Vandna Dhanwal
- Centre for Nanoscience & Nanotechnology (U.I.E.A.S.T), Panjab University, Chandigarh 160014, India; Cancer Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
| | - Archana Katoch
- Cancer Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
| | - Amanpreet Singh
- Department of Chemistry, Indian Institute of Technology Ropar (IIT Ropar), Roopnagar, Punjab 140001, India
| | - Souneek Chakraborty
- Cancer Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
| | - Mir Mohd Faheem
- Cancer Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
| | - Gaganpreet Kaur
- Centre for Nanoscience & Nanotechnology (U.I.E.A.S.T), Panjab University, Chandigarh 160014, India
| | - Debasis Nayak
- Cancer Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India
| | - Narinder Singh
- Department of Chemistry, Indian Institute of Technology Ropar (IIT Ropar), Roopnagar, Punjab 140001, India
| | - Anindya Goswami
- Cancer Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Canal Road, Jammu 180001, India.
| | - Navneet Kaur
- Department of Chemistry, Panjab University, Chandigarh 160014, India.
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13
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Zhan TG, Yin HH, Zheng ST, Lin WC, Shen NL, Cui J, Kong LC, Liu LJ, Zhang KD. Toward bidirectional photoswitchable colored photochromic molecules with visible light stability. Chem Commun (Camb) 2018; 54:9356-9359. [DOI: 10.1039/c8cc05294h] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Novel bidirectional photoswitchable colored photochromic [2]rotaxanes were fabricated, whose colored states exhibit considerable visible-light stability and high thermal stability. These features are crucial for photochromic molecules to be applied in information displays and data storage.
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Affiliation(s)
- Tian-Guang Zhan
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- College of Chemistry and Life Science
- Zhejiang Normal University
- Jinhua 321004
- China
| | - Huan-Huan Yin
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- College of Chemistry and Life Science
- Zhejiang Normal University
- Jinhua 321004
- China
| | - Si-Tai Zheng
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- College of Chemistry and Life Science
- Zhejiang Normal University
- Jinhua 321004
- China
| | - Wei-Cheng Lin
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- College of Chemistry and Life Science
- Zhejiang Normal University
- Jinhua 321004
- China
| | - Nan-Li Shen
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- College of Chemistry and Life Science
- Zhejiang Normal University
- Jinhua 321004
- China
| | - Jiecheng Cui
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- College of Chemistry and Life Science
- Zhejiang Normal University
- Jinhua 321004
- China
| | - Li-Chun Kong
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- College of Chemistry and Life Science
- Zhejiang Normal University
- Jinhua 321004
- China
| | - Li-Juan Liu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- College of Chemistry and Life Science
- Zhejiang Normal University
- Jinhua 321004
- China
| | - Kang-Da Zhang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- College of Chemistry and Life Science
- Zhejiang Normal University
- Jinhua 321004
- China
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14
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Shimoyama D, Ikeda T, Sekiya R, Haino T. Synthesis and Structure of Feet-to-Feet Connected Bisresorcinarenes. J Org Chem 2017; 82:13220-13230. [DOI: 10.1021/acs.joc.7b02301] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daisuke Shimoyama
- Department of Chemistry,
Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Toshiaki Ikeda
- Department of Chemistry,
Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry,
Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry,
Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
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15
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De Simone NA, Schettini R, Talotta C, Gaeta C, Izzo I, Della Sala G, Neri P. Directing the Cation Recognition Ability of Calix[4]arenes toward Asymmetric Phase-Transfer Catalysis. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700912] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Nicola Alessandro De Simone
- Dipartimento di Chimica e Biologia “A. Zambelli”; Università di Salerno; Via Giovanni Paolo II 132 84084 Fisciano (Salerno) Italy
| | - Rosaria Schettini
- Dipartimento di Chimica e Biologia “A. Zambelli”; Università di Salerno; Via Giovanni Paolo II 132 84084 Fisciano (Salerno) Italy
| | - Carmen Talotta
- Dipartimento di Chimica e Biologia “A. Zambelli”; Università di Salerno; Via Giovanni Paolo II 132 84084 Fisciano (Salerno) Italy
| | - Carmine Gaeta
- Dipartimento di Chimica e Biologia “A. Zambelli”; Università di Salerno; Via Giovanni Paolo II 132 84084 Fisciano (Salerno) Italy
| | - Irene Izzo
- Dipartimento di Chimica e Biologia “A. Zambelli”; Università di Salerno; Via Giovanni Paolo II 132 84084 Fisciano (Salerno) Italy
| | - Giorgio Della Sala
- Dipartimento di Chimica e Biologia “A. Zambelli”; Università di Salerno; Via Giovanni Paolo II 132 84084 Fisciano (Salerno) Italy
| | - Placido Neri
- Dipartimento di Chimica e Biologia “A. Zambelli”; Università di Salerno; Via Giovanni Paolo II 132 84084 Fisciano (Salerno) Italy
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16
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La Manna P, Talotta C, Gaeta C, Soriente A, De Rosa M, Neri P. Threading of an Inherently Directional Calixarene Wheel with Oriented Ammonium Axles. J Org Chem 2017; 82:8973-8983. [PMID: 28799754 DOI: 10.1021/acs.joc.7b01388] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The threading of monostoppered alkylbenzylammonium axles 7+ and 8+ with the calix[6]-wheel 3 can occur by both routes of entering the macrocycle 3 in the cone conformation: passage through the upper rim and the through the lower rim. Thus, under thermodynamic conditions, with both the axles 7+ and 8+, the two possible orientations of calix[2]pseudorotaxane, namely, endo-benzyl and endo-alkyl, are formed by a stereoselectivity controlled by the endo-alkyl rule. Interestingly, by 1H NMR monitoring of the threading process between 8+ and 3, we revealed two calix[2]pseudorotaxane isomers in which the calix-wheel adopts 1,2,3-alternate and cone conformations, which represent the kinetic and thermodynamic species, respectively. Finally, the synthesis of ammonium-based oriented calix[2]rotaxane is here described.
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Affiliation(s)
- Pellegrino La Manna
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
| | - Carmen Talotta
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
| | - Carmine Gaeta
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
| | - Annunziata Soriente
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
| | - Margherita De Rosa
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
| | - Placido Neri
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
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17
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De Rosa M, Talotta C, Gaeta C, Soriente A, Neri P, Pappalardo S, Gattuso G, Notti A, Parisi MF, Pisagatti I. Calix[5]arene Through-the-Annulus Threading of Dialkylammonium Guests Weakly Paired to the TFPB Anion. J Org Chem 2017; 82:5162-5168. [PMID: 28426214 DOI: 10.1021/acs.joc.7b00406] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Through-the-annulus threading of calix[5]arene penta-O-ethers by dialkylammonium cations coupled to the loosely coordinating superweak TFPB- anion has been achieved. 1H NMR titration data show that preorganization of the calix[5]arene scaffold leads to great thermodynamic stability of the pseudorotaxane complexes as well as to a favorable threading kinetic. Thus, calix[5]arene 1c, bearing tert-butyl groups at the wide rim, was threaded by all of the cations under study (with the exception of the dibenzylammonium 2b+) more tightly than the other derivatives under investigation (Ka's up to 2.02 ± 0.2 × 105 M-1) because of its preorganized cone conformation. According to DFT calculations, van der Waals interactions between the tert-butyl groups of 1c and the alkyl chain of the cationic axle are likely responsible for the remarkable stability observed. The threading of the calix[5]arene wheels with the asymmetric pentylbenzylammonium axle 2c+ led to the toposelective formation of the endo-pentylpseudorotaxane stereoisomer in agreement with the known "endo-alkyl rule". Owing to the steric hindrance of the axle phenyl group, the threading of the guest was seen to occur in a unidirectional fashion through the calixarene narrow rim.
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Affiliation(s)
- Margherita De Rosa
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, 84084 Fisciano (Salerno), Italy
| | - Carmen Talotta
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, 84084 Fisciano (Salerno), Italy
| | - Carmine Gaeta
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, 84084 Fisciano (Salerno), Italy
| | - Annunziata Soriente
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, 84084 Fisciano (Salerno), Italy
| | - Placido Neri
- Dipartimento di Chimica e Biologia "A. Zambelli", Università di Salerno , Via Giovanni Paolo II 132, 84084 Fisciano (Salerno), Italy
| | - Sebastiano Pappalardo
- Dipartimento di Scienze Chimiche, Università di Catania , Viale A. Doria 6, 95125 Catania, Italy
| | - Giuseppe Gattuso
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina , Viale F. Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Anna Notti
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina , Viale F. Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Melchiorre F Parisi
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina , Viale F. Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Ilenia Pisagatti
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina , Viale F. Stagno d'Alcontres 31, 98166 Messina, Italy
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18
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Gao C, Luan ZL, Zhang Q, Yang S, Rao SJ, Qu DH, Tian H. Triggering a [2]Rotaxane Molecular Shuttle by a Photochemical Bond-Cleavage Strategy. Org Lett 2017; 19:1618-1621. [PMID: 28304173 DOI: 10.1021/acs.orglett.7b00393] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The successful triggering of ring-shuttling motion between two stations in a [2]rotaxane is demonstrated by employing a photochemical bond-cleavage strategy. A photolabile bulk barrier is covalently introduced into two identical stations of the thread to prevent dynamic shuttling of the macrocycle, resulting in a "gated" state. Irradiation of UV light (λ = 365 nm) results in the complete removal of the bulk barrier and the balanced shuttling motion of the macrocycle, indicating an "open" state of the rotaxane. In addition, the process from the "open" rotaxane to the "gated" rotaxane was executed by a chemical-rebonding method.
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Affiliation(s)
- Chuan Gao
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, China
| | - Zhou-Lin Luan
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, China
| | - Qi Zhang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, China
| | - Shun Yang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, China
| | - Si-Jia Rao
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, China
| | - Da-Hui Qu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, China
| | - He Tian
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, China
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19
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Khan FST, Pandey AK, Rath SP. Remarkable Anion-Dependent Spin-State Switching in Diiron(III) μ-Hydroxo Bisporphyrins: What Role do Counterions Play? Chemistry 2016; 22:16124-16137. [PMID: 27682429 DOI: 10.1002/chem.201603163] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Indexed: 12/20/2022]
Abstract
Addition of 2,4,6-trinitrophenol (HTNP) to an ethene-bridged diiron(III) μ-oxo bisporphyrin (1) in CH2 Cl2 initially leads to the formation of diiron(III) μ-hydroxo bisporphyrin (2⋅TNP) with a phenolate counterion that, after further addition of HTNP or dissolution in a nonpolar solvent, converts to a diiron(III) complex with axial phenoxide coordination (3⋅(TNP)2 ). The progress of the reaction from μ-oxo to μ-hydroxo to axially ligated complex has been monitored in solution by using 1 H NMR spectroscopy because their signals appear in three different and distinct spectral regions. The X-ray structure of 2⋅TNP revealed that the nearly planar TNP counterion fits perfectly within the bisporphyrin cavity to form a strong hydrogen bond with the μ-hydroxo group, which thus stabilizes the two equivalent iron centers. In contrast, such counterions as I5 , I3 , BF4 , SbF6 , and PF6 are found to be tightly associated with one of the porphyrin rings and, therefore, stabilize two different spin states of iron in one molecule. A spectroscopic investigation of 2⋅TNP has revealed the presence of two equivalent iron centers with a high-spin state (S=5/2) in the solid state that converts to intermediate spin (S=3/2) in solution. An extensive computational study by using a range of DFT methods was performed on 2⋅TNP and 2+ , and clearly supports the experimentally observed spin flip triggered by hydrogen-bonding interactions. The counterion is shown to perturb the spin-state ordering through, for example, hydrogen-bonding interactions, switched positions between counterion and axial ligand, ion-pair interactions, and charge polarization. The present investigation thus provides a clear rationalization of the unusual counterion-specific spin states observed in the μ-hydroxo bisporphyrins that have so far remained the most outstanding issue.
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Affiliation(s)
| | - Anjani Kumar Pandey
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Sankar Prasad Rath
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India.
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20
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Sil D, Khan FST, Rath SP. Effect of Inter-Porphyrin Distance on Spin-State in Diiron(III) μ-Hydroxo Bisporphyrins. Chemistry 2016; 22:14585-97. [DOI: 10.1002/chem.201602018] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Indexed: 12/16/2022]
Affiliation(s)
- Debangsu Sil
- Department of Chemistry; Indian Institute of Technology Kanpur; Kanpur- 208016 India
| | | | - Sankar Prasad Rath
- Department of Chemistry; Indian Institute of Technology Kanpur; Kanpur- 208016 India
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21
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A Versatile Axle for the Construction of Disassemblage Rotaxanes. Molecules 2016; 21:molecules21081043. [PMID: 27517897 PMCID: PMC6274001 DOI: 10.3390/molecules21081043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 08/02/2016] [Accepted: 08/04/2016] [Indexed: 11/23/2022] Open
Abstract
Rotaxanes are unique mechanical devices that hold great promise as sensors. We report on two new rotaxanes that contain an acid or base sensitive trigger and readily disassemble in a wide range of environments. Disassemblage was observed under TLC and 1H-NMR analysis. The axle is highly charged, which enhances solubility in aqueous environments, and can be readily derivatized with sensor components. The trigger was swapped in a one-pot method, which is promising for the rapid production of a series of sensors.
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22
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Sil D, Bhowmik S, Khan FST, Rath SP. Experimental and Theoretical Investigation of a Series of Novel Dimanganese(III) μ-Hydroxo Bisporphyrins: Magneto–Structural Correlation and Effect of Metal Spin on Porphyrin Core Deformation. Inorg Chem 2016; 55:3239-51. [DOI: 10.1021/acs.inorgchem.5b02226] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Debangsu Sil
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Susovan Bhowmik
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | | | - Sankar Prasad Rath
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
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23
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Byrne S, Mullen KM. Sensing anions on surfaces: tethering triazolium based anion receptors to polymer resins. RSC Adv 2016. [DOI: 10.1039/c6ra03569h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Herein we report the development of a new series of surface bound triazolium based anion sensors. Differences in the chemical reactivity and anion binding properties were observed; highlighting the need for good surface characterisation techniques such as HR MAS NMR.
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Affiliation(s)
- S. Byrne
- School of Chemistry, Physics and Mechanical Engineering
- Queensland University of Technology
- Brisbane
- Australia
| | - K. M. Mullen
- School of Chemistry, Physics and Mechanical Engineering
- Queensland University of Technology
- Brisbane
- Australia
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24
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Liu H, Tu JQ, Zhang CH, Xiao QT, Wang TH, Ju XL. Selective complexation of di-n-hexylammonium salts by tailed porphyrin host. NEW J CHEM 2016. [DOI: 10.1039/c6nj00045b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A di-n-hexylammonium ion was selectively encapsulated in the cavity of tailed porphyrins due to induced fit and lipophilic interactions.
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Affiliation(s)
- Hui Liu
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering & Pharmacy
- Wuhan Institute of Technology
- Wuhan 430073
- P. R. China
| | - Ji-Qiang Tu
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering & Pharmacy
- Wuhan Institute of Technology
- Wuhan 430073
- P. R. China
| | - Cheng-Hua Zhang
- School of Basic Medical Sciences
- North Sichuan Medical College
- Nanchong 637007
- P. R. China
| | - Qiao-Ting Xiao
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering & Pharmacy
- Wuhan Institute of Technology
- Wuhan 430073
- P. R. China
| | - Tian-Hua Wang
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering & Pharmacy
- Wuhan Institute of Technology
- Wuhan 430073
- P. R. China
| | - Xiu-Lian Ju
- Key Laboratory for Green Chemical Process of Ministry of Education
- School of Chemical Engineering & Pharmacy
- Wuhan Institute of Technology
- Wuhan 430073
- P. R. China
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25
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Talotta C, Gaeta C, De Rosa M, Ascenso JR, Marcos PM, Neri P. Alkylammonium Guest Induced-Fit Recognition by a Flexible Dihomooxacalix[4]arene Derivative. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501319] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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26
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Havel V, Sindelar V. Anion Binding Inside a Bambus[6]uril Macrocycle in Chloroform. Chempluschem 2015; 80:1601-1606. [DOI: 10.1002/cplu.201500345] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Indexed: 01/17/2023]
Affiliation(s)
- Vaclav Havel
- Department of Chemistry and RECETOX; Masaryk University; Kamenice 5 625 00 Brno Czech Republic
| | - Vladimir Sindelar
- Department of Chemistry and RECETOX; Masaryk University; Kamenice 5 625 00 Brno Czech Republic
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27
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Carrazana-García JA, Cabaleiro-Lago EM, Campo-Cacharrón A, Rodríguez-Otero J. A theoretical study of ternary indole-cation-anion complexes. Org Biomol Chem 2015; 12:9145-56. [PMID: 25296040 DOI: 10.1039/c4ob01879f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The simultaneous interactions of an anion and a cation with a π system were investigated by MP2 and M06-2X theoretical calculations. Indole was chosen as a model π system for its relevance in biological environments. Two different orientations of the anion, interacting with the N-H and with the C-H groups of indole, were considered. The four cations (Na(+), NH4(+), C(NH2)3(+) and N(CH3)4(+)) and the four anions (Cl(-), NO3(-), HCOO(-) and BF4(-)) included in the study are of biological interest. The total interaction energy of the ternary complexes was calculated and separated into its two- and three-body components and all of them are further divided into their electrostatic, exchange, repulsion, polarization and dispersion contributions using the local molecular orbital-energy decomposition analysis (LMO-EDA) methodology. The binding energy of the indole-cation-anion complexes depends on both ions, with the cation having the strongest effect. The intense cation-anion attraction determines the geometric and energetic features in all ternary complexes. These structures, with both ions on the same side of the π system, show an anti-cooperative interaction. However, the interaction is not only determined by electrostatics, but also the polarization contribution is important. Specific interactions like the one established between the anion and the N-H group of indole or the proton transfer between an acidic cation and a basic anion play a significant role in the energetics and the structure of particular complexes. The presence of the polar solvent as modelled with the polarizable continuum model (PCM) does not seem to have a significant effect on the geometry of the ternary complexes, but drastically weakens the interaction energy. Also, the strength of the interaction is reduced at a faster rate when the anion is pushed away, compared to the results obtained in the gas phase. The combination of PCM with the addition of one water molecule indicates that the PCM method properly reproduces the main energetic and geometrical changes, even at the quantitative level, but the explicit hydration allows refining the solvent effect and detecting cases that do not follow the general trend.
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Affiliation(s)
- Jorge A Carrazana-García
- Departamento de Química Física, Facultade de Ciencias, Universidade de Santiago de Compostela, Campus de Lugo, Avenida Alfonso X El Sabio s/n, Lugo 27002, Lugo, Spain.
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28
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Zhang J, Dong S, Zhang K, Liang A, Yang X, Huang F, Cao Y. A series of blue supramolecular polymers with different counterions for polymer light-emitting diodes. Chem Commun (Camb) 2015; 50:8227-30. [PMID: 24931700 DOI: 10.1039/c4cc03080j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of blue supramolecular polymers with different counterions based on host-guest interactions were developed for polymer light-emitting diodes. It was found that the counterions play important roles in the resulting materials' supramolecular interactions as well as the device performance.
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Affiliation(s)
- Jie Zhang
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, 510640, Guangzhou, P. R. China.
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29
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Lima CFRAC, Fernandes AM, Melo A, Gonçalves LM, Silva AMS, Santos LMNBF. Diarylferrocene tweezers for cation binding. Phys Chem Chem Phys 2015; 17:23917-23. [DOI: 10.1039/c5cp04530d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Diarylferrocenes can act as molecular tweezers of cations. Their unique molecular shape and low torsional potentials allow for strong binding of small cations in the gas phase.
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Affiliation(s)
- Carlos F. R. A. C. Lima
- CIQ
- Departamento de Química e Bioquímica
- Faculdade de Ciências da Universidade do Porto
- Porto
- Portugal
| | - Ana M. Fernandes
- Department of Chemistry & QOPNA
- University of Aveiro
- Aveiro
- Portugal
| | - André Melo
- LAQV-REQUIMTE
- Departamento de Química e Bioquímica
- Faculdade de Ciências da Universidade do Porto
- Porto
- Portugal
| | - Luís M. Gonçalves
- LAQV-REQUIMTE
- Departamento de Química e Bioquímica
- Faculdade de Ciências da Universidade do Porto
- Porto
- Portugal
| | | | - Luís M. N. B. F. Santos
- CIQ
- Departamento de Química e Bioquímica
- Faculdade de Ciências da Universidade do Porto
- Porto
- Portugal
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30
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Gattuso G, Notti A, Parisi MF, Pisagatti I, Marcos PM, Ascenso JR, Brancatelli G, Geremia S. Selective recognition of biogenic amine hydrochlorides by heteroditopic dihomooxacalix[4]arenes. NEW J CHEM 2015. [DOI: 10.1039/c4nj01423e] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
New receptors for the selective binding of monoamine neurotransmitters and trace amine hydrochlorides, as ion pairs, are described.
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Affiliation(s)
- Giuseppe Gattuso
- Dipartimento di Scienze Chimiche
- Università di Messina
- 98166 Messina
- Italy
| | - Anna Notti
- Dipartimento di Scienze Chimiche
- Università di Messina
- 98166 Messina
- Italy
| | | | - Ilenia Pisagatti
- Dipartimento di Scienze Chimiche
- Università di Messina
- 98166 Messina
- Italy
| | - Paula Maria Marcos
- Centro de Ciências Moleculares e Materiais
- Faculdade de Ciências da Universidade de Lisboa
- 1749-016 Lisboa
- Portugal
- Faculdade de Farmácia da Universidade de Lisboa
| | | | - Giovanna Brancatelli
- Centro di Eccellenza in Biocristallografia
- Dipartimento di Scienze Chimiche e Farmaceutiche
- Università di Trieste
- 34127 Trieste
- Italy
| | - Silvano Geremia
- Centro di Eccellenza in Biocristallografia
- Dipartimento di Scienze Chimiche e Farmaceutiche
- Università di Trieste
- 34127 Trieste
- Italy
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31
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Zeng F, Chen CF. Synthesis of a novel water-soluble cylindrical macrotricyclic host and its complexation with N-methylquinolinium and N-methylisoquinolinium salts: formation of 1 : 2 complexes in water. Org Biomol Chem 2015; 13:1988-91. [DOI: 10.1039/c4ob02533d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A water-soluble cylindrical macrotricyclic host could form 1 : 2 complexes with N-methylquinolinium or N-methylisoquinolinium salts in water solution and in the solid state.
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Affiliation(s)
- Fei Zeng
- Beijing National Laboratory for Molecular Sciences
- CAS Key Laboratory of Molecular Recognition and Function
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Chuan-Feng Chen
- Beijing National Laboratory for Molecular Sciences
- CAS Key Laboratory of Molecular Recognition and Function
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
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32
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Huo Y, Li D, Wan R, Ma P, Zhang D, Niu J, Wang J. Synthesis and characterization of organotriphosphonate-functionalized TM-containing polyoxotungstates. RSC Adv 2015. [DOI: 10.1039/c5ra20806h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new family of organotriphosphonate-functionalized TM-containing polyoxotungstates, K4H6[H4{(AsW9O33)TM(H2O)W5O11(N(CH2PO3)3)}2(μ2-O)2]·24H2O [TM = Ni (1), Co (2), Mn (3)], have been synthesized from the preformed POM precursor [As2W19O67(H2O)]14−.
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Affiliation(s)
- Yu Huo
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Dandan Li
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Rong Wan
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Pengtao Ma
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Dongdi Zhang
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Jingyang Niu
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Jingping Wang
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
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33
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Talotta C, Gaeta C, Neri P. Endo-Complexation of Alkylammonium Ions by Calix[4]arene Cavity: Facilitating Cation−π Interactions through the Weakly Coordinating Anion Approach. J Org Chem 2014; 79:9842-6. [DOI: 10.1021/jo5016689] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Carmen Talotta
- Dipartimento
di Chimica e
Biologia, Università di Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
| | - Carmine Gaeta
- Dipartimento
di Chimica e
Biologia, Università di Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
| | - Placido Neri
- Dipartimento
di Chimica e
Biologia, Università di Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy
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34
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Self-assembly of an organo-palladium molecular basket that encapsulates cobalticarborane anion in water. INORG CHEM COMMUN 2014. [DOI: 10.1016/j.inoche.2014.03.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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35
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Schwarz G, Haßlauer I, Kurth DG. From terpyridine-based assemblies to metallo-supramolecular polyelectrolytes (MEPEs). Adv Colloid Interface Sci 2014; 207:107-20. [PMID: 24485594 DOI: 10.1016/j.cis.2013.12.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 11/29/2013] [Accepted: 12/19/2013] [Indexed: 11/27/2022]
Abstract
Introducing metal ion coordination as bonding motive into polymer architectures provides new structures and properties for polymeric materials. The metal ions can be part of the backbone or of the side-chains. In the case of linear metallo-polymers the repeat unit bears at least two metal ion receptors in order to facilitate metal-ion induced self-assembly. If the binding constants are sufficiently high, macromolecular assemblies will form in a solution. Likewise, polymeric networks can be formed by metal ion induced crosslinking. The metal ion coordination sites introduce dynamic features, e.g. for self-healing or responsive materials, as well as additional functional properties including spin-crossover, electro-chromism, and reactivity. Terpyridines have attracted attention as receptors in metallo-polymers due to their favorable properties. It is well suited to assemble linear rigid-rod like metallo-polymers in case of rigid ditopic ligands. Terpyridine binds a large number of metal ions and are readily functionalized giving rise to a plethora of available ligands as components in metallo-polymers. By the judicious choice of the metal ions, the design of the ligands, the counter ions and the boundary conditions of self-assembly, the final structure and properties of the resulting metallo-polymers can be tailored at all length scales. Here, we review recent activities in the area of metallo-polymers based on terpyridines as central metal ion receptors.
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Affiliation(s)
- Guntram Schwarz
- Julius-Maximilians-University Würzburg, Chemical Technology of Advanced Materials, Röntgenring 11, D-97070 Würzburg, Germany
| | - Iris Haßlauer
- Julius-Maximilians-University Würzburg, Chemical Technology of Advanced Materials, Röntgenring 11, D-97070 Würzburg, Germany
| | - Dirk G Kurth
- Julius-Maximilians-University Würzburg, Chemical Technology of Advanced Materials, Röntgenring 11, D-97070 Würzburg, Germany; Fraunhofer ISC, Neunerplatz 2, D-97082 Würzburg, Germany.
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36
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Kaufmann L, Traulsen NL, Springer A, Schröder HV, Mäkelä T, Rissanen K, Schalley CA. Evaluation of multivalency as an organization principle for the efficient synthesis of doubly and triply threaded amide rotaxanes. Org Chem Front 2014. [DOI: 10.1039/c4qo00077c] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Affiliation(s)
- Roberta Ciao
- Dipartimento di Chimica e Biologia and NANO_MATES Research Center, Università di Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano (Salerno), Italy
| | - Carmen Talotta
- Dipartimento di Chimica e Biologia and NANO_MATES Research Center, Università di Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano (Salerno), Italy
| | - Carmine Gaeta
- Dipartimento di Chimica e Biologia and NANO_MATES Research Center, Università di Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano (Salerno), Italy
| | - Placido Neri
- Dipartimento di Chimica e Biologia and NANO_MATES Research Center, Università di Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano (Salerno), Italy
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38
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39
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Ghosh SK, Bhowmik S, Sil D, Rath SP. Effect of Heme-Heme Interactions and Modulation of Metal Spins by Counter Anions in a Series of Diiron(III)-μ-hydroxo Bisporphyrins: Unusual Stabilization of Two Different Spins in a Single Molecular Framework. Chemistry 2013; 19:17846-59. [DOI: 10.1002/chem.201301318] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 08/16/2013] [Indexed: 11/10/2022]
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40
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Lin YH, Lai CC, Liu YH, Peng SM, Chiu SH. Sodium Ions Template the Formation of Rotaxanes from BPX26C6 and Nonconjugated Amide and Urea Functionalities. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201304636] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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41
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Lin YH, Lai CC, Liu YH, Peng SM, Chiu SH. Sodium Ions Template the Formation of Rotaxanes from BPX26C6 and Nonconjugated Amide and Urea Functionalities. Angew Chem Int Ed Engl 2013; 52:10231-6. [DOI: 10.1002/anie.201304636] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Indexed: 11/07/2022]
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42
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Gaeta C, Talotta C, Margarucci L, Casapullo A, Neri P. Through-the-annulus threading of the larger calix[8]arene macrocycle. J Org Chem 2013; 78:7627-38. [PMID: 23834296 DOI: 10.1021/jo401206j] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A complete study of the through-the-annulus threading of the larger calix[8]arene macrocycle with di-n-alkylammonium cations has been performed in the presence of the "superweak" TFPB counterion. Thus, it was found that such threading occurs only upon partial preorganization of the calix[8]arene macroring by intramolecular bridging. In particular, 1,5-bridged calix[8]arenes with a meta- or para-xylylene bridge (2 and 3) gave pseudo[2]rotaxanes in which one dialkylammonium axle (4a-4e(+)) was threaded into one of the two subcavities of the calix[8]-wheel. Conformational studies by using chemical shift surface maps and DFT calculations evidenced a 3/4-cone geometry for these subcavities. Higher pseudorotaxane K(ass) values were obtained for calix[8]-wheels 2 and 3, with respect to calix[6]-host 1a, due to the cooperative effect of their two subcavities. Dynamic NMR studies on calix[8]-pseudorotaxanes evidenced a direct correlation between K(ass) (and ΔG(ass)) values and energy barriers for calix inversion due to the effectiveness of thread templation. In accordance with DFT calculations, an endo-alkyl preference, over the endo-benzyl one, was observed by threading calix[8]-wheel 3 with the directional n-butylbenzylammonium axle 4d(+).
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Affiliation(s)
- Carmine Gaeta
- Dipartimento di Chimica e Biologia, Università di Salerno, Via Giovanni Paolo II 132, I-84084 Fisciano, Salerno, Italy.
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43
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Wałęsa-Chorab M, Gorczyński A, Kubicki M, Korabik M, Patroniak V. Mono-, di- and trinuclear complexes of bis(terpyridine) ligand: Synthesis, crystal structures and magnetic properties. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.02.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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44
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Cho JH, Harrowfield J, Kim JY, Kim Y, Lee YH, Ohto K, Thuéry P, Won MS, Woo A. Some post-Wernerian coordination chemistry. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.06.044] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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45
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Cervantes R, Sánchez RI, Tiburcio J. Co-Conformational Isomerism in a Neutral Ion-Paired Supramolecular System. Chemistry 2013; 19:4051-7. [DOI: 10.1002/chem.201203483] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2012] [Indexed: 11/10/2022]
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46
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Mesquida N, Dinarès I, Ibáñez A, Alcalde E. [14]Heterophane prototypes containing azolium and/or azole anion-binding motifs. Org Biomol Chem 2013; 11:6385-96. [DOI: 10.1039/c3ob41214h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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47
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Gaeta C, Talotta C, Mirra S, Margarucci L, Casapullo A, Neri P. Catenation of calixarene annulus. Org Lett 2012; 15:116-9. [PMID: 23286391 DOI: 10.1021/ol303142c] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Through-the-annulus-catenated calixarenes have been obtained, for the first time, by exploiting the "superweak anion" approach that allows the threading of the calix cavity with functionalized dialkylammonium axles. In addition, the first example of a stereoprogrammed synthesis of a catenane orientational isomer (an oriented calix[2]catenane) has been obtained, after macrocyclization, by using a directional alkylbenzylammonium axle.
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Affiliation(s)
- Carmine Gaeta
- Dipartimento di Chimica e Biologia and NANO_MATES Research Center, Università di Salerno, Via Ponte don Melillo, I-84084 Fisciano (Salerno), Italy.
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48
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Mahadevi AS, Sastry GN. Cation-π interaction: its role and relevance in chemistry, biology, and material science. Chem Rev 2012; 113:2100-38. [PMID: 23145968 DOI: 10.1021/cr300222d] [Citation(s) in RCA: 728] [Impact Index Per Article: 60.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- A Subha Mahadevi
- Molecular Modeling Group, CSIR-Indian Institute of Chemical Technology Tarnaka, Hyderabad 500 607, Andhra Pradesh, India
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49
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Ni M, Guan Y, Wu L, Deng C, Hu X, Jiang J, Lin C, Wang L. Improved recognition of alkylammonium salts by ion pair recognition based on a novel heteroditopic pillar[5]arene receptor. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.09.043] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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50
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Gaeta C, Talotta C, Farina F, Teixeira FA, Marcos PM, Ascenso JR, Neri P. Alkylammonium cation complexation into the narrow cavity of dihomooxacalix[4]arene macrocycle. J Org Chem 2012; 77:10285-93. [PMID: 23062004 DOI: 10.1021/jo3019945] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
How big should a calixarene macrocycle be for endo-cavity complexation to occur or to allow through-the-annulus threading? To answer these questions, a complete study on the complexation of primary and secondary (di)alkylammonium cations by 18-membered p-tert-butyldihomooxacalix[4]arene macroring has been performed in the presence of the "superweak" TFPB counterion. Thus, it was found that this macrocycle is currently the smallest calixarene able to host linear and branched alkylammonium guests inside its aromatic cavity. Molecular mechanics calculations revealed that this recognition event is mainly driven by a H-bonding interaction between the guest ammonium group and the host CH(2)OCH(2) bridge. The endo-cavity complexation of chiral s-BuNH(3)(+) guest results in an asymmetric complex in the NMR time scale. The chirality transfer from guest to host is likely due to a restricted guest motion inside the tight cavity. The complexation study with secondary di-n-alkylammonium·TFPB salts revealed that the 18-membered dihomooxacalix[4]arene macroring cannot give the through-the-annulus threading with them because of its small dimension. However, the macrocycle is able to complex such ions, which can only be accommodated in an hook-like conformation characterized by two unfavorable gauche interactions around the CH(2)-NH(2)(+) bonds. The strain generated by this unfavorable folding is very likely compensated by stronger H-bonds and more favorable CH/π interactions between guest and host.
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Affiliation(s)
- Carmine Gaeta
- Dipartimento di Chimica e Biologia, Università di Salerno, Via Ponte don Melillo, I-84084 Fisciano (Salerno), Italy.
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