title: Supergelation via purely aromatic π-π driven self-assembly of pseudodiscotic oxadiazole mesogens.
abstract: A series of highly luminescent oxadiazole-based stilbene molecules (OXD4, OXD8, OXD10, and OXD12) exhibiting interesting enantiotropic liquid crystalline and gelation properties have been synthesized and characterized. The molecules possessing longer alkyl substituents, OXD10 and OXD12, possess a pseudodisc shape and are capable of behaving as supergelators in nonpolar solvents, forming self-standing gels with very high thermal and mechanical stability. Notably the self-assembly of these molecules, which do not possess any hydrogen-bonding motifs normally observed in most reported supergelators, is driven purely by π-stacking interactions of the constituent molecules. The d-spacing ratios estimated from XRD analysis of OXD derivatives possessing longer alkyl chains show that the molecules are arranged in a columnar fashion in the mesogens and the self-assembled nanofibers formed in the gelation process.
authors.affiliation: Photosciences and Photonics Section, Chemical Sciences and Technology Division, National Institute for Interdisciplinary Science and Technology (NIIST) and Network of Institutes for Solar Energy, Council of Scientific and Industrial Research (CSIR) , Trivandrum 695 019 India.
authors.forename: Aneesh P
authors.initials: AP
authors.lastname: Sivadas
authors.forename: N S Saleesh
authors.initials: NS
authors.lastname: Kumar
authors.forename: Deepak D
authors.initials: DD
authors.lastname: Prabhu
authors.forename: Shinto
authors.initials: S
authors.lastname: Varghese
authors.forename: S Krishna
authors.initials: SK
authors.lastname: Prasad
authors.forename: D S Shankar
authors.initials: DS
authors.lastname: Rao
authors.forename: Suresh
authors.initials: S
authors.lastname: Das