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Gambhir D, Kumar K, Murugesan P, Yadav A, Sinha Ray S, Koner RR. Amino Acid-Based Molecular and Membranous Chiral Tools for Enantiomeric Recognition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:2745-2753. [PMID: 38279959 DOI: 10.1021/acs.langmuir.3c03396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2024]
Abstract
Given the need, both academic and industrial, for new approaches and technologies for chiral discrimination of enantiomers, the present work demonstrates the development through rational design and integration of two new chiral platforms (molecular and membranous) for enantioselective recognition through visual as well as microscopic observation. The molecular platform (TPT) is based on the tryptophan derivative developed through the condensation of two tryptophan units with terepthaloyl chloride. While TPT based on l-tryptophan recognizes R-mandelic acid over the S-isomer, the host with reverse chirality (TPDT) recognizes S-mandelic acid over R-isomer. The role of chemical functionality in this sensitive recognition process was established experimentally by developing an analogue of TPT and by judiciously using different chiral analytes. Importantly, a detailed theoretical study at the molecular level revealed the U-shaped conformation of TPT, creating a cavity for accommodating a chiral guest with selective functional interaction resulting in the discrimination of enantiomers. Finally, a chiral polymeric mat of poly(methyl methacrylate) (PMMA)/polyacrylonitrile (PAN) (2:3) impregnated with TPT was developed via electrospinning. The resulting fibrous mat was successfully utilized for chiral recognition through microscopic and architectural observation. Hence, the present work reports simple chiral tools for enantiomeric recognition.
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Affiliation(s)
- Diksha Gambhir
- School of Chemical Sciences, Indian Institute of Technology, Mandi, Mandi 175075, Himachal Pradesh, India
| | - Krishan Kumar
- School of Chemical Sciences, Indian Institute of Technology, Mandi, Mandi 175075, Himachal Pradesh, India
| | - Premkumar Murugesan
- School of Mechanical and Materials Engineering, Indian Institute of Technology, Mandi, Mandi 175075, Himachal Pradesh, India
| | - Arti Yadav
- School of Chemical Sciences, Indian Institute of Technology, Mandi, Mandi 175075, Himachal Pradesh, India
| | - Sumit Sinha Ray
- Department of Textile and Fibre Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110016, India
| | - Rik Rani Koner
- School of Mechanical and Materials Engineering, Indian Institute of Technology, Mandi, Mandi 175075, Himachal Pradesh, India
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De S, Das G. Surfactant-induced disaggregation of a quinoxaline AIEgen scaffold: aggregation aptitude in the solid and solution states. SOFT MATTER 2023; 19:6116-6121. [PMID: 37538008 DOI: 10.1039/d3sm00638g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
We have designed five propellor-shaped molecules based on the quinoxaline scaffold with a functional group variation. They exhibit aggregation-induced emission, and the responses of these congeners regarding good solvents and poor solvents are investigated both spectroscopically and microscopically. Solid- as well as solution-state parallel analysis of the aggregation facet is laid out. Notably, L2 interacts specifically with a cationic surfactant, unlike other congeners where the mechanism proceeds via disaggregation. Real sample analysis was carried out on freshwater samples as well as waste effluent samples from domestic households and industries, thus projecting the analytical and environmental significance.
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Affiliation(s)
- Sagnik De
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
| | - Gopal Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
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Gambhir D, Kumar S, Koner RR. Chiral gelators for visual enantiomeric recognition. SOFT MATTER 2022; 18:3624-3637. [PMID: 35481833 DOI: 10.1039/d2sm00002d] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Introduction of chirality in supramolecular gels has allowed the effective translation and amplification of molecular chirality. Upon integrating the stimuli-responsive nature of these gels with supramolecular chirality, a new platform for the discrimination of the enantiomeric guests through naked eye can be developed. Over the past decade, several groups have reported the development of chiral supramolecular gels for enantioselective recognition through gel formation or collapse. However, to the best of our knowledge, we are yet to come across a review highlighting the utilization of chiral supramolecular gels for macroscopic discrimination of enantiomers. In this article, we have articulated the chiral gelators developed to date for the recognition of different enantiomeric analytes focusing on their mode of recognition with an in-depth analysis of the mechanism of interactions assisting the recognition process.
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Affiliation(s)
- Diksha Gambhir
- School of Basic Science, Indian Institute of Technology, Mandi, Mandi-175075, Himachal Pradesh, India
| | - Sunil Kumar
- School of Basic Science, Indian Institute of Technology, Mandi, Mandi-175075, Himachal Pradesh, India
| | - Rik Rani Koner
- School of Basic Science, Indian Institute of Technology, Mandi, Mandi-175075, Himachal Pradesh, India
- School of Engineering, Indian Institute of Technology, Mandi, Mandi-175075, Himachal Pradesh, India.
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Patterson AK, El-Qarra LH, Smith DK. Chirality-directed hydrogel assembly and interactions with enantiomers of an active pharmaceutical ingredient. Chem Commun (Camb) 2022; 58:3941-3944. [PMID: 35244630 DOI: 10.1039/d1cc06942j] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Enantiomers of the low-molecular-weight gelator (LMWG) DBS-CONHNH2, based on D- or L- 1,3 : 2,4-dibenzylidenesorbitol (DBS), were synthesised. Enantiomeric gels are equivalent, but when mixtures of enantiomers are used, although gels still form, they are weaker than homochiral gels. Nanoscale chirality is lost on adding even a small proportion of the opposite enantiomer - homochiral assembly underpins effective gelation. Enantiomeric gels encapsulate the two enantiomers of anti-inflammatory drug naproxen, with thermal & mechanical differences between diastereomeric systems. We hence demonstrate the importance of chirality in DBS assembly and its interactions with chiral additives.
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Affiliation(s)
- Anna K Patterson
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
| | - Lamisse H El-Qarra
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
| | - David K Smith
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
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Liu J, Yu Y, Wang C, Shen J, Feng J, Qi W. Fabrication of a chiral luminescent hydrogel from gold nanoclusters via molecular recognition. Chem Commun (Camb) 2021; 57:10202-10205. [PMID: 34522926 DOI: 10.1039/d1cc04011a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A novel supramolecular chiral hydrogel with enhanced emission was obtained by the co-assembly of achiral thiobarbituric acid-modified gold nanoclusters (TBA-AuNCs) with chiral histidine molecules. Chirality transfer from histidine to the supramolecular hydrogels was achieved through the π-π stacking and intermolecular H-bonding based on molecular recognition. This work gives a creative strategy for the building of chiral nanocluster-based materials.
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Affiliation(s)
- Junxiao Liu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273100, China.
| | - You Yu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273100, China.
| | - Chen Wang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273100, China.
| | - Jinglin Shen
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273100, China.
| | - Jin Feng
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273100, China.
| | - Wei Qi
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273100, China.
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