title: A Nonarchetypal 5,6-Dihydro-2H-pyrano[3,2-g]indolizine-Based Solution-Solid Dual Emissive AIEgen with Multicolor Tunability.
abstract: Screening of a chemical library of pyranones and their ring transformed fluorophores led to the discovery of a novel 5,6-dihydro-2H-pyrano[3,2-g]indolizine (DPI) class of the luminogen DPI 7, which exhibited unique solution-solid dual emission (SSDE) behavior with an emission color shift from bright-green in solution to a strong red emission in the solid state. The AIE mechanism of these luminogens revealed a well-defined set of noncovalent interactions (CH⋅⋅⋅O and CH⋅⋅⋅N) that block the motion of C2-flexure leading to restriction of intramolecular vibrations (RIV) in the solid state. DPI-7 is the first example of solution-solid dual emissive RIV-based AIEgen, which has great potential both in biomedical imaging and optoelectronic fields.
authors.affiliation: Fluorescent Chemistry Laboratory, Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.
authors.forename: Ashutosh
authors.initials: A
authors.lastname: Raghuvanshi
authors.affiliation: Fluorescent Chemistry Laboratory, Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.
authors.forename: Ajay Kumar
authors.initials: AK
authors.lastname: Jha
authors.affiliation: Fluorescent Chemistry Laboratory, Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.
authors.forename: Ashutosh
authors.initials: A
authors.lastname: Sharma
authors.affiliation: Fluorescent Chemistry Laboratory, Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.
authors.forename: Shahida
authors.initials: S
authors.lastname: Umar
authors.affiliation: Fluorescent Chemistry Laboratory, Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.
authors.forename: Shachi
authors.initials: S
authors.lastname: Mishra
authors.affiliation: Molecular and Structural Biology Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.
authors.forename: Ruchir
authors.initials: R
authors.lastname: Kant
authors.affiliation: Fluorescent Chemistry Laboratory, Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India.|Academy of Scientific and Innovative Research, New Delhi, 110001, India.
authors.forename: Atul
authors.initials: A
authors.lastname: Goel
keywords: aggregation-induced emission; chromophores; fluorescence; noncovalent interactions; restriction of intramolecular vibration