title: Fine-Tuning of Saponification-Triggered Gelation by Strategic Modification of Peripheral Substituents: Gelation Regulators.
abstract: A pioneering approach towards controlling the efficiency of saponification assisted gelation in ethyl ester based ZnII-complexes have been described. Using four new ester containing bis-salen ZnIIcomplexes (C1-C4) involving different para-azo phenyl substituted ligands it has been clearly shown that gelation efficiency is greatly influenced by the electronic effects of the substituents (-H (C1), -CH3(C2), -NO2(C3), and -OCH3(C4)). Morphological, photophysical, and rheological investigations corroborated the experimental observations well and established that gelation efficiency was enhanced with electron-withdrawing characteristics of substituents (C4<C2<C1<C3). This conclusion was also supported by DFT studies.
authors.affiliation: Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221 005, (U.P.), India.
authors.forename: Ashish
authors.initials: A
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221 005, (U.P.), India.
authors.forename: Roop Shikha
authors.initials: RS
authors.lastname: Singh
authors.affiliation: Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221 005, (U.P.), India.
authors.forename: Amit
authors.initials: A
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221 005, (U.P.), India.
authors.forename: Afsar
authors.initials: A
authors.lastname: Ali
authors.affiliation: Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221 005, (U.P.), India.
authors.forename: Arnab
authors.initials: A
authors.lastname: Biswas
authors.affiliation: Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221 005, (U.P.), India. dspbhu@bhu.ac.in.
authors.forename: Daya Shankar
authors.initials: DS
authors.lastname: Pandey
keywords: J-aggregation; conformational transformation; gels; luminescence; saponification trigger