title: Effect of alicyclic ring size on the photophysical and photochemical properties of bis(arylidene)cycloalkanone compounds.
abstract: A series of bis(arylidene)cycloalkanone compounds based on cyclobutanone, cyclopentanone, cyclohexanone and cycloheptanone, C4-C7, respectively, with a D-π-A-π-D structure containing the same donor and acceptor but different alicyclic rings was prepared. The effects of alicyclic ring size on the photophysical, photochemical and electrochemical properties of these compounds were investigated systematically. We found that an increase of the number of carbons in the central alicyclic ring leads to changes in geometry, which has significant effects on the conjugation, and photophysical and photochemical properties. These effects include decreases in the fluorescence quantum yield, transient lifetimes, peak extinction coefficients, and the singlet oxygen quantum yield with the increase of the ring size. The one-photon absorption spectra, the two-photon absorption (2PA) spectra, and the fluorescence spectra all show a hypsochromic shift with increasing ring size. The results of this study provide guidance for the design of new cycloketone-based D-π-A-π-D 2PA compounds for photopolymerization and photodynamic therapy applications.
authors: Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P R China.
authors: Qianli
authors: Q
authors: Zou
authors: Yuxia
authors: Y
authors: Zhao
authors: Nikolay S
authors: NS
authors: Makarov
authors: Jochen
authors: J
authors: Campo
authors: Hao
authors: H
authors: Yuan
authors: De-Cai
authors: DC
authors: Fang
authors: Joseph W
authors: JW
authors: Perry
authors: Feipeng
authors: F
authors: Wu