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Kundu S, Egboluche TK, Hossain MA. Urea- and Thiourea-Based Receptors for Anion Binding. Acc Chem Res 2023. [PMID: 36913317 DOI: 10.1021/acs.accounts.2c00701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2023]
Abstract
ConspectusOver the past five decades, significant progress has been made in the field of anion recognition with a diverse variety of synthetic receptors because of the fundamental importance of anions in chemical, environmental, and biological processes. In particular, urea- and thiourea-based molecules offering directional binding sites are attractive receptors for anions due to their ability to bind anions employing primarily hydrogen-bonding interactions under neutral conditions and have gained a recent paramount attention in the area of supramolecular chemistry. The presence of two imine (-NH) groups on each urea/thiourea functionality in these receptors gives them potential for excellent binding of an anion, mimicking the natural binding process in living cells. The increased acidity offered by thiocarbonyl groups (C═S) in a thiourea-functionalized receptor could enhance its anion binding ability as compared to its analogous urea-based receptor containing a carbonyl (C═O) group. During the last several years, our group has been involved in exploring a wide variety of synthetic receptors, and we have studied them with anions experimentally and computationally. In this Account, we will highlight the overall summary of our group's efforts focusing on anion coordination chemistry of urea- and thiourea-based receptors with varying linkers (rigid and flexible), dimensions (dipodal and tripodal), and functionalities (bifunctional, trifunctional, and hexafunctional). Depending on the linkers and attached groups, bifunctional-based dipodal receptors can bind anions forming 1:1 or 1:2 complexes. A dipodal receptor with flexible aliphatic or rigid m-xylyl linkers forms a cleft to bind a single anionic species in the pocket. However, a dipodal receptor with p-xylyl linkers binds anions in both 1:1 and 1:2 binding modes. As compared to a dipodal receptor, a tripodal receptor provides a more organized cavity for an anion, forming predominantly a 1:1 complex, while the binding strength and selectivity are influenced by linking chains and terminal groups. A hexafunctional-based tripodal receptor bridged with o-phenylene groups provides two clefts that can host two small anions or one large anion. However, a hexafunctional receptor with p-phenylene groups as linkers binds two anions, one at an inner pocket and the other at an outer pocket. It was shown that the presence of suitable chromophores at the terminal groups makes the receptor useful for the naked-eye detection for certain anions (e.g., fluoride, acetate) in solution. The field of anion binding chemistry is rapidly growing, and this Account aims to provide fundamental aspects influencing the binding strength and selectivity of anionic species with abiotic receptors which might eventually be useful for the development of new devices for binding, sensing, and separating biologically and environmentally important anions.
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Affiliation(s)
- Sanchita Kundu
- Department of Chemistry and Biochemistry, Jackson State University, 1400 J. R. Lynch Street, Jackson, Mississippi 39217, United States
| | - Tochukwu Kevin Egboluche
- Department of Chemistry and Biochemistry, Jackson State University, 1400 J. R. Lynch Street, Jackson, Mississippi 39217, United States
| | - Md Alamgir Hossain
- Department of Chemistry and Biochemistry, Jackson State University, 1400 J. R. Lynch Street, Jackson, Mississippi 39217, United States
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2
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Barišić D, Lešić F, Tireli Vlašić M, Užarević K, Bregović N, Tomišić V. Anion binding by receptors containing NH donating groups – What do anions prefer? Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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3
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Shinde S, Mansour M, Mavliutova L, Incel A, Wierzbicka C, Abdel-Shafy HI, Sellergren B. Oxoanion Imprinting Combining Cationic and Urea Binding Groups: A Potent Glyphosate Adsorber. ACS OMEGA 2022; 7:587-598. [PMID: 35036726 PMCID: PMC8757333 DOI: 10.1021/acsomega.1c05079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 12/08/2021] [Indexed: 06/14/2023]
Abstract
The use of polymerizable hosts in anion imprinting has led to powerful receptors with high oxyanion affinity and specificity in both aqueous and non-aqueous environments. As demonstrated in previous reports, a carefully tuned combination of orthogonally interacting binding groups, for example, positively charged and neutral hydrogen bonding monomers, allows receptors to be constructed for use in either organic or aqueous environments, in spite of the polymer being prepared in non-competitive solvent systems. We here report on a detailed experimental design of phenylphosphonic and benzoic acid-imprinted polymer libraries prepared using either urea- or thiourea-based host monomers in the presence or absence of cationic comonomers for charge-assisted anion recognition. A comparison of hydrophobic and hydrophilic crosslinking monomers allowed optimum conditions to be identified for oxyanion binding in non-aqueous, fully aqueous, or high-salt media. This showed that recognition improved with the water content for thiourea-based molecularly imprinted polymers (MIPs) based on hydrophobic EGDMA with an opposite behavior shown by the polymers prepared using the more hydrophilic crosslinker PETA. While the affinity of thiourea-based MIPs increased with the water content, the opposite was observed for the oxourea counterparts. Binding to the latter could however be enhanced by raising the pH or by the introduction of cationic amine- or Na+-complexing crown ether-based comonomers. Use of high-salt media as expected suppressed the amine-based charge assistance, whereas it enhanced the effect of the crown ether function. Use of the optimized receptors for removing the ubiquitous pesticide glyphosate from urine finally demonstrated their practical utility.
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Affiliation(s)
- Sudhirkumar Shinde
- Biofilms
Research Center for Biointerfaces, Department of Biomedical Sciences,
Faculty of Health and Society, Malmö
University, 20506 Malmö, Sweden
- School
of Consciousness, Dr. Vishwanath Karad MIT
World Peace University, Kothrud, 411038 Pune, India
| | - Mona Mansour
- Biofilms
Research Center for Biointerfaces, Department of Biomedical Sciences,
Faculty of Health and Society, Malmö
University, 20506 Malmö, Sweden
| | - Liliia Mavliutova
- Biofilms
Research Center for Biointerfaces, Department of Biomedical Sciences,
Faculty of Health and Society, Malmö
University, 20506 Malmö, Sweden
| | - Anil Incel
- Biofilms
Research Center for Biointerfaces, Department of Biomedical Sciences,
Faculty of Health and Society, Malmö
University, 20506 Malmö, Sweden
| | - Celina Wierzbicka
- Biofilms
Research Center for Biointerfaces, Department of Biomedical Sciences,
Faculty of Health and Society, Malmö
University, 20506 Malmö, Sweden
| | - Hussein I. Abdel-Shafy
- Water
Research & Pollution Control Department, National Research Centre, Dokki, 11727 Cairo, Egypt
| | - Börje Sellergren
- Biofilms
Research Center for Biointerfaces, Department of Biomedical Sciences,
Faculty of Health and Society, Malmö
University, 20506 Malmö, Sweden
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4
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Al Isawi WA, Salome AZ, Ahmed BM, Zeller M, Mezei G. Selective binding of anions by rigidified nanojars: sulfate vs. carbonate. Org Biomol Chem 2021; 19:7641-7654. [PMID: 34524323 DOI: 10.1039/d1ob01318a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Selective binding and transport of highly hydrophilic anions is ubiquitous in nature, as anion binding proteins can differentiate between similar anions with over a million-fold efficiency. While comparable selectivity has occasionally been achieved for certain anions using small, artificial receptors, the selective binding of certain anions, such as sulfate in the presence of carbonate, remains a very challenging task. Nanojars of the formula [anion⊂{Cu(OH)(pz)}n]2- (pz = pyrazolate; n = 27-33) are totally selective for either CO32- or SO42- over anions such as NO3-, ClO4-, BF4-, Cl-, Br- and I-, but cannot differentiate between the two. We hypothesized that rigidification of the nanojar outer shell by tethering pairs of pyrazole moieties together will restrict the possible orientations of the OH hydrogen-bond donor groups in the anion-binding cavity of nanojars, similarly to anion-binding proteins, and will lead to selectivity. Indeed, by using either homoleptic or heteroleptic nanojars of the general formula [anion⊂Cun(OH)n(L2-L6)y(pz)n-2y]2- (n = 26-31) based on a series of homologous ligands HpzCH2(CH2)xCH2pzH (x = 0-4; H2L2-H2L6), selectivity for carbonate (with L2 and with L4-L6/pz mixtures) or for sulfate (with L3) has been achieved. The synthesis of new ligands H2L3, H2L4 and H2L5, X-ray crystal structures of H2L4 and the tetrahydropyranyl-protected derivatives (THP)2L4 and (THP)2L5, synthesis and characterization by electrospray-ionization mass spectrometry (ESI-MS) of carbonate- and sulfate-nanojars derived from ligands H2L2-H2L6, as well as detailed selectivity studies for CO32-vs. SO42- using these novel nanojars are presented.
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Affiliation(s)
- Wisam A Al Isawi
- Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, USA.
| | - Austin Z Salome
- Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, USA.
| | - Basil M Ahmed
- Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, USA.
| | - Matthias Zeller
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA
| | - Gellert Mezei
- Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, USA.
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5
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Manna U, Portis B, Egboluche TK, Nafis M, Hossain MA. Anion Binding Studies of Urea and Thiourea Functionalized Molecular Clefts. Front Chem 2021; 8:575701. [PMID: 33585396 PMCID: PMC7878373 DOI: 10.3389/fchem.2020.575701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 12/21/2020] [Indexed: 11/13/2022] Open
Abstract
Two rationally designed 4-nitrophenyl-based molecular clefts functionalized with thiourea (L1) and urea (L2) have been synthesized and studied for a variety of anions by UV-Vis and colorimetric techniques in DMSO. Results from the binding studies suggest that both L1 and L2 bind halides showing the order: fluoride > chloride > bromide > iodide; and oxoanions showing the order: dihydrogen phosphate > hydrogen sulfate > nitrate > perchlorate. Each receptor has been shown to form a 1:1 complex with an anion via hydrogen bonding interactions, displaying distinct color change for fluoride and dihydrogen phosphate in solution. As compared to the urea-based receptor L2, the thiourea-based receptor L1 exhibits stronger affinity for anions due the presence of more acidic thiourea functional groups.
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Affiliation(s)
- Utsab Manna
- Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, United States
| | - Bobby Portis
- Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, United States
| | - Tochukwu K Egboluche
- Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, United States
| | - Muhammad Nafis
- Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, United States
| | - Md Alamgir Hossain
- Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, United States
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Shinde S, Incel A, Mansour M, Olsson GD, Nicholls IA, Esen C, Urraca J, Sellergren B. Urea-Based Imprinted Polymer Hosts with Switchable Anion Preference. J Am Chem Soc 2020; 142:11404-11416. [PMID: 32425049 PMCID: PMC7467678 DOI: 10.1021/jacs.0c00707] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
![]()
The
design of artificial oxyanion receptors with switchable ion
preference is a challenging goal in host–guest chemistry. We
here report on molecularly imprinted polymers (MIPs) with an external
phospho-sulpho switch driven by small molecule modifiers. The polymers
were prepared by hydrogen bond-mediated imprinting of the mono- or
dianions of phenyl phosphonic acid (PPA), phenyl sulfonic acid (PSA),
and benzoic acid (BA) using N-3,5-bis-(trifluoromethyl)-phenyl-Ń-4-vinylphenyl urea (1) as the functional
host monomer. The interaction mode between the functional monomer
and the monoanions was elucidated by 1H NMR titrations
and 1H–1H NMR NOESY supported by molecular
dynamic simulation, which confirmed the presence of high-order complexes.
PPA imprinted polymers bound PPA with an equilibrium constant Keq = 1.8 × 105 M–1 in acetonitrile (0.1% 1,2,2,6,6-pentamethylpiperidine) and inorganic
HPO42– and SO42– with Keq = 2.9 × 103 M–1 and 4.5 × 103 M–1, respectively, in aqueous buffer. Moreover, the chromatographic
retentivity of phosphonate versus sulfonate was shown to be completely
switched on this polymer when changing from a basic to an acidic modifier.
Mechanistic insights into this system were obtained from kinetic investigations
and DSC-, MALDI-TOF-MS-, 1H NMR-studies of linear polymers
prepared in the presence of template. The results suggest the formation
of template induced 1–1 diad repeats in the polymer main chain
shedding unique light on the relative contributions of configurational
and conformational imprinting.
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Affiliation(s)
- Sudhirkumar Shinde
- Department of Biomedical Sciences, Faculty of Health and Society, Malmö University, 20506 Malmö, Sweden.,Faculty of Chemistry, Technical University of Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany
| | - Anil Incel
- Department of Biomedical Sciences, Faculty of Health and Society, Malmö University, 20506 Malmö, Sweden
| | - Mona Mansour
- Department of Biomedical Sciences, Faculty of Health and Society, Malmö University, 20506 Malmö, Sweden
| | - Gustaf D Olsson
- Bioorganic & Biophysical Chemistry Laboratory, Linneaus University Center for Biomaterials Chemistry, Department of Chemistry & Biomedical Sciences, Linnaeus University, 39182 Kalmar, Sweden
| | - Ian A Nicholls
- Bioorganic & Biophysical Chemistry Laboratory, Linneaus University Center for Biomaterials Chemistry, Department of Chemistry & Biomedical Sciences, Linnaeus University, 39182 Kalmar, Sweden
| | - Cem Esen
- Faculty of Chemistry, Technical University of Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany
| | - Javier Urraca
- Faculty of Chemistry, Technical University of Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany
| | - Börje Sellergren
- Department of Biomedical Sciences, Faculty of Health and Society, Malmö University, 20506 Malmö, Sweden.,Faculty of Chemistry, Technical University of Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany
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7
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Portis B, Mirchi A, Hasan MH, Khansari ME, Johnson CR, Leszczynski J, Tandon R, Alamgir Hossain M. Cleft‐Induced Ditopic Binding of Spherical Halides with a Hexaurea Receptor. ChemistrySelect 2020. [DOI: 10.1002/slct.201903950] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Bobby Portis
- Department: Chemistry and Biochemistry Institution: Jackson State University 1400 J R Lynch Street Jackson MS 39217 USA
| | - Ali Mirchi
- Department: Chemistry and Biochemistry Institution: Jackson State University 1400 J R Lynch Street Jackson MS 39217 USA
| | - Mohammad H. Hasan
- Department: Microbiology and Immunology, Institution University of Mississippi Medical Center Jackson MS 39216 USA
| | - Maryam Emami Khansari
- Department: Chemistry and Biochemistry Institution: Jackson State University 1400 J R Lynch Street Jackson MS 39217 USA
| | - Corey R. Johnson
- Department: Chemistry and Biochemistry Institution: Jackson State University 1400 J R Lynch Street Jackson MS 39217 USA
| | - Jerzy Leszczynski
- Department: Chemistry and Biochemistry Institution: Jackson State University 1400 J R Lynch Street Jackson MS 39217 USA
| | - Ritesh Tandon
- Department: Microbiology and Immunology, Institution University of Mississippi Medical Center Jackson MS 39216 USA
| | - Md. Alamgir Hossain
- Department: Chemistry and Biochemistry Institution: Jackson State University 1400 J R Lynch Street Jackson MS 39217 USA
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8
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Murugesan K, Jeyasingh V, Lakshminarayanan S, Narayanan S, Piramuthu L. Traditional hydrogen bonding donors controlled colorimetric selective anion sensing in tripodal receptors: First-naked-eye detection of cyanide by a tripodal receptor via fluoride displacement assay. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 223:117238. [PMID: 31299615 DOI: 10.1016/j.saa.2019.117238] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Revised: 05/19/2019] [Accepted: 06/01/2019] [Indexed: 06/10/2023]
Abstract
Here in we report tris (3-aminopropyl) amine based tripodal receptors L, L1 and L2 which were functionalized with 4-nitrophenyl moieties having thio-urea, amide and sulfonamide as hydrogen bonding moieties respectively, shows a strong selectivity towards cyanide. A competitive colorimetric assay with L in the presence of fluoride ion suggests that the cyanide ion is much capable of displacing the bound fluoride, showing a sharp distinguishable color change. To the best of our knowledge, this is the first example of a naked-eye detection of cyanide via fluoride displacement assay by a tripodal receptor and such a displacement phenomenon is not observes in the cases of L1 and L2, instead the receptor L1 binds nitrate and cyanide; L2 binds dihydrogen phosphate and cyanide. Using this assay, we have proposed an AND logic gate using L·F- and CN-.
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Affiliation(s)
- Kumaresan Murugesan
- International Research Centre, Centre for Supramolecular Chemistry, Kalasalingam University, Kalasalingam Academy of Research and Education, Anand Nagar, Krishnankoil, 626 126 Srivilliputtur, Tamil Nadu, India; Department of Chemistry, Kalasalingam Academy of Research and Education, Kalasalingam University, Anand Nagar, Krishnankoil, Srivilliputtur 626 126, Tamil Nadu, India
| | - Vanthana Jeyasingh
- International Research Centre, Centre for Supramolecular Chemistry, Kalasalingam University, Kalasalingam Academy of Research and Education, Anand Nagar, Krishnankoil, 626 126 Srivilliputtur, Tamil Nadu, India; Department of Chemistry, Kalasalingam Academy of Research and Education, Kalasalingam University, Anand Nagar, Krishnankoil, Srivilliputtur 626 126, Tamil Nadu, India
| | - Sudha Lakshminarayanan
- International Research Centre, Centre for Supramolecular Chemistry, Kalasalingam University, Kalasalingam Academy of Research and Education, Anand Nagar, Krishnankoil, 626 126 Srivilliputtur, Tamil Nadu, India; Department of Chemistry, Kalasalingam Academy of Research and Education, Kalasalingam University, Anand Nagar, Krishnankoil, Srivilliputtur 626 126, Tamil Nadu, India; Department of Chemistry, J.P. College of Arts & Science, Agarakattu, Ayikudi 627852, Tamil Nadu, India
| | - Selvapalam Narayanan
- International Research Centre, Centre for Supramolecular Chemistry, Kalasalingam University, Kalasalingam Academy of Research and Education, Anand Nagar, Krishnankoil, 626 126 Srivilliputtur, Tamil Nadu, India; Department of Chemistry, Kalasalingam Academy of Research and Education, Kalasalingam University, Anand Nagar, Krishnankoil, Srivilliputtur 626 126, Tamil Nadu, India
| | - Lakshminarayanan Piramuthu
- International Research Centre, Centre for Supramolecular Chemistry, Kalasalingam University, Kalasalingam Academy of Research and Education, Anand Nagar, Krishnankoil, 626 126 Srivilliputtur, Tamil Nadu, India.
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9
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Vlatković M, Feringa BL. Unclicking of thioureas: Base catalyzed elimination of anilines and isothiocyanates from thioureas. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.02.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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10
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Zuo W, Jia C, Zhang H, Zhao Y, Yang XJ, Wu B. Selective recognition of choline phosphate by tripodal hexa-urea receptors with dual binding sites: crystal and solution evidence. Chem Sci 2019; 10:2483-2488. [PMID: 30881678 PMCID: PMC6385852 DOI: 10.1039/c8sc04338h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Accepted: 12/26/2018] [Indexed: 11/21/2022] Open
Abstract
Two tripodal hexa-urea receptors functionalized with aromatic terminal groups are capable of binding choline phosphate (CP). Crystal structures of the host-guest complexes reveal that the zwitterion CP is efficiently encapsulated in the tripodal hosts in a dual-site binding mode. The phosphate tail of CP is coordinated by the urea groups and the quaternary ammonium head is bound in a 'composite aromatic box' through cation-π and hydrogen-bonding interactions. Such a partial aromatic binding environment for the Me3N-+ cation mimics that of most enzymes catalyzing the conversion of quaternary ammonium substrates. Moreover, NMR, ESI-MS, and fluorescence studies demonstrate the selective binding and sensing of CP over other competing species such as ADP, ATP, choline and derivatives.
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Affiliation(s)
- Wei Zuo
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education , College of Chemistry and Materials Science , Northwest University , Xi'an 710069 , China . ;
| | - Chuandong Jia
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education , College of Chemistry and Materials Science , Northwest University , Xi'an 710069 , China . ;
| | - Huizheng 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 710069 , China . ;
| | - Yanxia Zhao
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education , College of Chemistry and Materials Science , Northwest University , Xi'an 710069 , China . ;
| | - Xiao-Juan Yang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education , College of Chemistry and Materials Science , Northwest University , Xi'an 710069 , China . ;
| | - Biao Wu
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education , College of Chemistry and Materials Science , Northwest University , Xi'an 710069 , China . ;
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11
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Highly selective and sensitive macrocycle-based dinuclear foldamer for fluorometric and colorimetric sensing of citrate in water. Sci Rep 2018; 8:286. [PMID: 29321505 PMCID: PMC5762659 DOI: 10.1038/s41598-017-18322-w] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 12/08/2017] [Indexed: 11/17/2022] Open
Abstract
The selective detection of citrate anions is essential for various biological functions in living systems. A quantitative assessment of citrate is required for the diagnosis of various diseases in the human body; however, it is extremely challenging to develop efficient fluorescence and color-detecting molecular probes for sensing citrate in water. Herein, we report a macrocycle-based dinuclear foldamer (1) assembled with eosin Y (EY) that has been studied for anion binding by fluorescence and colorimetric techniques in water at neutral pH. Results from the fluorescence titrations reveal that the 1·EY ensemble strongly binds citrate anions, showing remarkable selectivity over a wide range of inorganic and carboxylate anions. The addition of citrate anions to the 1·EY adduct led to a large fluorescence enhancement, displaying a detectable color change under both visible and UV light in water up to 2 μmol. The biocompatibility of 1·EY as an intracellular carrier in a biological system was evaluated on primary human foreskin fibroblast (HF) cells, showing an excellent cell viability. The strong binding properties of the ensemble allow it to be used as a highly sensitive, detective probe for biologically relevant citrate anions in various applications.
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12
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Manna U, Das G. Neutral host–guest capsular associations by a homologous halophenyl-substituted organic tris-urea receptor series: solid and solution state studies. NEW J CHEM 2018. [DOI: 10.1039/c8nj04457k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient and regular construction of unimolecular fluoride-encapsulated complexes and oxyanion-bound dimeric capsular assemblies by three electron-deficient neutral tris-urea receptors is observed corroborated by solution-state analysis.
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Affiliation(s)
- Utsab Manna
- Department of Chemistry, Indian Institute of Technology Guwahati
- India
| | - Gopal Das
- Department of Chemistry, Indian Institute of Technology Guwahati
- India
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13
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Emami Khansari M, Hasan MH, Johnson CR, Williams NA, Wong BM, Powell DR, Tandon R, Hossain MA. Anion Complexation Studies of 3-Nitrophenyl-Substituted Tripodal Thiourea Receptor: A Naked-Eye Detection of Sulfate via Fluoride Displacement Assay. ACS OMEGA 2017; 2:9057-9066. [PMID: 30023599 PMCID: PMC6044562 DOI: 10.1021/acsomega.7b01485] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Accepted: 12/04/2017] [Indexed: 06/08/2023]
Abstract
A thiourea-based tripodal receptor L substituted with 3-nitrophenyl groups has been synthesized, and the binding affinity for a variety of anions has been studied by 1H NMR titrations and nuclear Overhauser enhancement spectroscopy experiments in dimethyl sulfoxide-d6. As investigated by 1H NMR titrations, the receptor binds an anion in a 1:1 binding mode, showing the highest binding and strong selectivity for sulfate anion. A competitive colorimetric assay in the presence of fluoride suggests that the sulfate is capable of displacing the bound fluoride, showing a sharp visible color change. The strong affinity of L for sulfate was further supported by UV-vis titrations and density functional theory (DFT) calculations. Time-dependent DFT calculations indicate that the fluoride complex possesses a different optical absorption spectrum (due to charge transfer between the fluoride and the surrounding ligand) than the sulfate complex, reflecting the observed colorimetric change in these two complexes. The receptor was further tested for its biocompatibility on primary human foreskin fibroblasts and HeLa cells, exhibiting an excellent cell viability up to 100 μM concentration.
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Affiliation(s)
- Maryam Emami Khansari
- Department
of Chemistry and Biochemistry, Jackson State
University, Jackson, Mississippi 39217, United States
| | - Mohammad H. Hasan
- Department
of Microbiology and Immunology, University
of Mississippi Medical Center, Jackson, Mississippi 39216, United States
| | - Corey R. Johnson
- Department
of Chemistry and Biochemistry, Jackson State
University, Jackson, Mississippi 39217, United States
| | - Nya A. Williams
- Department
of Chemistry and Biochemistry, Jackson State
University, Jackson, Mississippi 39217, United States
| | - Bryan M. Wong
- Department
of Chemical & Environmental Engineering and Materials Science
& Engineering Program, University of
California—Riverside, Riverside, California 92521, United States
| | - Douglas R. Powell
- Department
of Chemistry and Biochemistry, University
of Oklahoma, Norman, Oklahoma 73019, United
States
| | - Ritesh Tandon
- Department
of Microbiology and Immunology, University
of Mississippi Medical Center, Jackson, Mississippi 39216, United States
| | - Md. Alamgir Hossain
- Department
of Chemistry and Biochemistry, Jackson State
University, Jackson, Mississippi 39217, United States
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14
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