title: E/Z isomerization, solvatachromism and aggregation-induced emission enhancement of donor-acceptor type oligo(p-phenylene vinylene)s.
abstract: A donor-acceptor molecule, PICNDSB, with cyclopenta[b]indole as the donor and (1,4-phenylene)bis(3-phenylacrylonitrile) as the acceptor, is designed and synthesized. PICNDSB shows typical aggregation-induced emission characteristics. The photoluminescence quantum yield of PICNDSB in dilute THF was only 0.7% and reaches 51.4% in the solid state. Compared with its analogue CzCNDSB, PICNDSB possesses stronger intramolecular charge transfer properties, as revealed from CV measurements, theoretical calculations, and their fluorescence behaviors. Correspondingly, the relatively more efficient electron-donating terminal group of cyclopenta[b]indole endows the molecule with a much higher two-photon absorption cross section of 1286 GM compared to CzCNDSB (357 GM).
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Qianjin Street No. 2699, Changchun, 130012, P. R. China. lup@jlu.edu.cn.
authors.forename: Cunfang
authors.initials: C
authors.lastname: Feng
authors.forename: Jinyu
authors.initials: J
authors.lastname: Li
authors.forename: Xiao
authors.initials: X
authors.lastname: Han
authors.forename: Xin
authors.initials: X
authors.lastname: He
authors.forename: Liqun
authors.initials: L
authors.lastname: Liu
authors.forename: Xiaoxiao
authors.initials: X
authors.lastname: Li
authors.forename: Xiaoyi
authors.initials: X
authors.lastname: Sun
authors.forename: Ping
authors.initials: P
authors.lastname: Lu
authors.forename: Yuguang
authors.initials: Y
authors.lastname: Ma