title: Stereochemical modulation of emission behaviour in E/Z isomers of diphenyldipyrroethene from aggregation induced emission to crystallization induced emission.
abstract: Herein, we report the synthesis, separation and characterisation of the E- and Z-isomers of dipyrrolyldiphenylethene to study their emission behaviour in the aggregation state and solid state. The E-isomer showed pronounced aggregation induced emission (AIE) whereas the Z-isomer showed crystallization induced emission (CIE). The present study explains that the emission behaviour (AIE/CIE) is dependent on the inter/intra molecular interactions between the molecules. The study also confirms that restriction of intramolecular rotation (RIR) is the main cause of AIE/CIE in olefinic luminogens Tetraphenylethylene (TPE) type systems rather than E/Z isomerisation.
authors.affiliation: Department of Chemistry, Indian institute of Technology Bombay, Powai, Mumbai-400076, India. kavitachemistry1@gmail.com ganapathi@chem.iitb.ac.in rajakannu@chem.iitb.ac.in ravikanth@chem.iitb.ac.in.
authors.forename: K
authors.initials: K
authors.lastname: Garg
authors.forename: E
authors.initials: E
authors.lastname: Ganapathi
authors.forename: P
authors.initials: P
authors.lastname: Rajakannu
authors.forename: M
authors.initials: M
authors.lastname: Ravikanth
mesh_terms: D018360:Crystallography, X-Ray; D008958:Models, Molecular; D015394:Molecular Structure; D011758:Pyrroles / Q000138:chemical synthesis / Q000737:chemistry*; D013237:Stereoisomerism; D013267:Stilbenes / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D011758:Pyrroles; D013267:Stilbenes