Contact
    Start Publications Photodimerization Kinetics of a Styrylquinoline Derivative in ...
    ←  Publication Finder
    Attension

    Photodimerization Kinetics of a Styrylquinoline Derivative in Langmuir-Blodgett Monolayers Monitored by Second Harmonic Generation

    Year: 2017

    Journal: J. Phys. Chem. C, Volume 121, OCT 26, page 23541–23550

    Authors: Ma, Yingxue; Xie, Yu; Lin, Lu; Zhang, Li; Liu, Minghua; Guo, Yuan; Lan, Zhenggang; Lu, Zhou

    Organizations: National Natural Science Foundation of China [21473217, 21227802, 21503248, 21673266, 21303216]; Chinese Ministry of Science and Technology [2013CB834504]; Natural Science Foundation of Shandong Province for Distinguished Young Scholars [JQ201504]

    To explore the influence of surface packing densities on the interfacial photochemical kinetics, the surface-selective second harmonic generation (SHG) technique was used to investigate the kinetics of two-photon induced [2 + 2] photocycloadditions of a styrylquinoline alkoxy derivative within the Langmuir-Blodgett (LB) monolayers. The laser power dependence experiment revealed that this interfacial photodimerization is a first-order reaction, which implies that the photoexcitation is the rate-limiting step. Interestingly, a comparison of photodimerization kinetics at different surface packing densities shows a nonmonotonic distribution of reaction rate constants, which can be attributed to a result of combined effects of the topochemical mechanism and steric hindrance. The atomic force microscopy measurements and theoretical calculations were also employed to help understand the [2 + 2] photocycloaddition mechanisms. The results presented in this work demonstrate that the surface packing density plays an important role in regulating the interfacial photoreactions within the LB monolayers composed of the conjugated aromatic molecular systems.
    View publication