Two novel binuclear sulfonic-functionalized ionic liquids: Influence of anion and carbon-spacer on catalytic efficiency for one-pot synthesis of bis(indolyl)methanes

Khaligh, Nader Ghaffari and Mihankhah, Taraneh and Johan, Mohd Rafie and Juan, Joon Ching (2018) Two novel binuclear sulfonic-functionalized ionic liquids: Influence of anion and carbon-spacer on catalytic efficiency for one-pot synthesis of bis(indolyl)methanes. Journal of Molecular Liquids, 259. pp. 260-273. ISSN 0167-7322

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Official URL: https://doi.org/10.1016/j.molliq.2018.03.044

Abstract

Two new binuclear sulfonic-functionalized ionic liquids with four-carbon spacer were synthesized and their structures were characterized by FTIR, MS, 1H and 13C NMR; then some physical properties and pH of the aqueous solution of new task-specific ionic liquids were determined. Their dual solvent-catalytic activity were studied for the synthesis of bis(indolyl)methanes under mild conditions. The catalytic activity of these ionic liquids were compared with some ionic liquids derived from pyrazinium, piperazinium, benzimidazolium, imidazolium mono- or di-cation containing chloride and hydrogen sulfate as counter anion under optimized conditions. It was proved that the new ionic liquids containing two sulfonic imidazole moieties with four-carbon spacer as well as hydrogen sulfate as acidic counter anion were superior to the previously reported ionic liquids.

Item Type: Article
Uncontrolled Keywords: Binuclear sulfonic-functionalized ionic liquid; Carbon-spacer effect; Anion effect; Dual solvent-catalyst properties; Bis(indolyl)methane
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 16 Jul 2019 08:10
Last Modified: 16 Jul 2019 08:10
URI: http://eprints.um.edu.my/id/eprint/21638

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