Light-Induced Transformation of a Supramolecular Gel to a Stronger Covalent Polymeric Gel.

Autor: Saleem SK; School of Chemistry, IISER Thiruvananthapuram, Kerala, 695551, India., Pramod T; School of Chemistry, IISER Thiruvananthapuram, Kerala, 695551, India., Kuruva P; School of Chemistry, IISER Thiruvananthapuram, Kerala, 695551, India., Haridas SV; School of Chemistry, IISER Thiruvananthapuram, Kerala, 695551, India., Shanmugam A; School of Physics, IISER Thiruvananthapuram, Kerala, 695551, India., Thalakulam M; School of Physics, IISER Thiruvananthapuram, Kerala, 695551, India., Sureshan KM; School of Chemistry, IISER Thiruvananthapuram, Kerala, 695551, India.
Jazyk: angličtina
Zdroj: Chemphyschem : a European journal of chemical physics and physical chemistry [Chemphyschem] 2024 Nov 04, pp. e202400861. Date of Electronic Publication: 2024 Nov 04.
DOI: 10.1002/cphc.202400861
Abstrakt: A polymerizable diacetylene gelator, containing urea and urethane groups, that congeals various non-polar solvents was synthesized. The gelator molecules self-assemble forming non-covalent polymers through intermolecular hydrogen bonding, as evidenced from FT-IR and concentration-dependent 1 H NMR spectroscopy. The self-assembly positions the diyne units of adjacent molecules at proximity and in a geometry suitable for their topochemical polymerization. UV irradiation of the gel resulted in topochemical polymerization, transforming the non-covalent polymer to a covalent polymer, in situ, in the gel state. The polymerization was confirmed by characterizing the polydiacetylene (PDA) using UV-Vis and Raman spectroscopy. Time-dependent rheological studies revealed gradual strengthening of the gel with the duration of irradiation, suggesting that the degree of polymerization increases with the duration of irradiation. The PDA formed is a semiconductor, which might be useful for various applications.
(© 2024 Wiley-VCH GmbH.)
Databáze: MEDLINE
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