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Carvalho DS, da Silva DGB, Hallwass F, Navarro-Vázquez A. An Acrylonitrile-Based Copolymer Gel as an NMR Alignment Medium for Extraction of Residual Dipolar Couplings of Small Molecules in Aqueous Solution. Chempluschem 2023; 88:e202200446. [PMID: 36782376 DOI: 10.1002/cplu.202200446] [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: 12/12/2022] [Revised: 01/19/2023] [Indexed: 01/24/2023]
Abstract
An NMR weakly-aligning polymer gel has been prepared by copolymerization of acrylonitrile and 2-acrylamide-2-methyl-1-propanesulfonic acid in the presence of 1,4-butanediol diacrylate as a cross-linker. The polymer readily swells in water in a large range of temperatures, although the swelling ratio is decreased in saline solutions. The swollen gel can be mechanically compressed, in a reversible way, generating anisotropy, as easily shown in 2 H NMR experiments, and allowing measurement of 1 DCH residual dipolar couplings (RDCs) through F1-coupled HSQC experiments. The performance of this gel as a NMR alignment medium was evaluated in several water-soluble organic molecules and, while it provided RDCs of proper size for sucrose and even such as small molecule as 5-norbornen-2-ol, in the case of azidothymidine and cefuroxime sodium salt the strong interaction of these molecules with the gel prevented successful extraction of the RDCs.
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Affiliation(s)
- Daiane S Carvalho
- Departamento de Química Fundamental, Universidade Federal de Pernambuco Cidade Universitria, CEP, 50.740-540, Recife, PE, Brazil
| | - Danilo G B da Silva
- Departamento de Química Fundamental, Universidade Federal de Pernambuco Cidade Universitria, CEP, 50.740-540, Recife, PE, Brazil
| | - Fernando Hallwass
- Departamento de Química Fundamental, Universidade Federal de Pernambuco Cidade Universitria, CEP, 50.740-540, Recife, PE, Brazil
| | - Armando Navarro-Vázquez
- Departamento de Química Fundamental, Universidade Federal de Pernambuco Cidade Universitria, CEP, 50.740-540, Recife, PE, Brazil
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Desai V, Sharma VS, Rathod SL, Sharma AS, Mali HA, Shah RR, Shrivastav PS. Thiacalixarene Appended Azo-based Supramolecular Systems: Self-assembly and Photo Tuning Reversible Liquid Crystalline Properties. Chemphyschem 2023; 24:e202200803. [PMID: 36642695 DOI: 10.1002/cphc.202200803] [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: 10/25/2022] [Revised: 01/10/2023] [Accepted: 01/10/2023] [Indexed: 01/17/2023]
Abstract
Four new azo-based supramolecular materials containing thiacalixarene core substituted by variable alkoxy groups (TFA1 -TFA4 ) have been designed and synthesized for the mesomorphic and photoswitching properties. The liquid crystalline behavior were accomplished by using DSC, POM, and XRD studies. All azo-based thiacalixarene based materials with short and higher chain length display columnar hexagonal mesophase with broad temperature range. The thermal behavior of all the materials was investigated by DSC and TGA study. The structural and conformational study of the lower rim functionalized materials was confirmed by using different techniques. These thiacalixarene moulded liquid crystalline compounds shows columnar self-assembly type behavior and higher thermal stability. The introduction of bi-substituted azo-ester network towards the lower rim of thiacalixarene core has impact on the electron delocalization and liquid crystalline properties. The photoswitching properties suggested cis and trans azo-isomerization under radiation of UV light and higher thermal back relaxation time. The mesogenic behaviour of compound TFA2 and TFA4 were demolished by the influence of cis and trans isomerization. The structure-property correlation is studied to understand the variation in mesogenic properties with the substitution of variable alkoxy side chain.
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Affiliation(s)
- Vipul Desai
- Department of Chemistry, K.K.Shah Jarodwala Maninagar Science College, Gujarat University, Ahmedabad, Gujarat, 380008, India
| | - Vinay S Sharma
- Department of Chemistry, School of Science, Gujarat University, Ahmedabad, Gujarat, 380009, India
| | - Suryajit L Rathod
- Department of Chemistry, School of Science, Gujarat University, Ahmedabad, Gujarat, 380009, India
| | - Anuj S Sharma
- Department of Chemistry, School of Science, Gujarat University, Ahmedabad, Gujarat, 380009, India
| | - Hitendra A Mali
- Department of Chemistry, School of Science, Gujarat University, Ahmedabad, Gujarat, 380009, India
| | - Rutesh R Shah
- Department of Chemistry, K.K.Shah Jarodwala Maninagar Science College, Gujarat University, Ahmedabad, Gujarat, 380008, India
| | - Pranav S Shrivastav
- Department of Chemistry, School of Science, Gujarat University, Ahmedabad, Gujarat, 380009, India
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