Alkali base triggered intramolecular charge transfer metallogels based on symmetrical A–π–D-chiral-D–π–A type ligands. Issue 15 (14th March 2016)

• Record Type: Journal Article
• Authors: Dixit, Manish Kumar; Pandey, Vinay Kumar; Dubey, Mrigendra
• Is Part Of: Soft matter. Volume 12:Issue 15(2016)
• Page Start: 3622
• Page End: 3630
• Publication Date: 2016-03-14
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/c6sm00372a
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : Threel -tartaric acid based symmetrical chiral structural isomeric nitrobenzylidenes have been synthesized with intent to achieve isomer specific metallogels with intramolecular charge transfer properties. Notably, Na + afforded twisted fibre morphology whilst Li + gave merely long range fibres. Abstract : Threel -tartaric acid based symmetrical A–π–D-chiral-D–π–A type structural isomeric nitrobenzylidenes (1–3 ) have been synthesized with intent to achieve isomer specific metallogels with intramolecular charge transfer properties. Alkali metal ions in these systems not only trigger charge transfer but also play a vital role in gelation. The presence of intramolecular rather than intermolecular charge transfer as well as aggregation has been well established by various kinds of experiments using UV-vis, CD, 1 H NMR, DFT and crystallography techniques. The role of alkali metal ions in triggering ICT was proved by titration with their respective crown ethers. Notably, Na + afforded twisted fiber morphology whilst Li + gave merely long range fibers. The true gel phase material was proved by detailed rheological studies.