title: Alkali base triggered intramolecular charge transfer metallogels based on symmetrical A-π-D-chiral-D-π-A type ligands.
abstract: Three l-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.
authors.affiliation: Department of Chemistry, Indian Institute of Technology (Banaras Hindu University), Varanasi-221005, U.P., India. mdubey.chy@itbhu.ac.in mrigendradubey@gmail.com.
authors.forename: Manish Kumar
authors.initials: MK
authors.lastname: Dixit
authors.affiliation: Department of Chemistry, Indian Institute of Technology (Banaras Hindu University), Varanasi-221005, U.P., India. mdubey.chy@itbhu.ac.in mrigendradubey@gmail.com.
authors.forename: Vinay Kumar
authors.initials: VK
authors.lastname: Pandey
authors.affiliation: Department of Chemistry, Indian Institute of Technology (Banaras Hindu University), Varanasi-221005, U.P., India. mdubey.chy@itbhu.ac.in mrigendradubey@gmail.com.
authors.forename: Mrigendra
authors.initials: M
authors.lastname: Dubey