Poly(octadecyl acrylate), ODA n, with a trimethoxysilyl group at one side of the terminal group was immobilized onto porous silica by using the reactive terminal group. The silica-supported ODA n underwent crystalline-to-isotropic phase transition. Interaction between ODA n and azobenzenes were evaluated by retention time in the liquid chromatography using the column packed with silica-supported ODA n. The chromatograph showed complete separation against the geometrical isomers of azobenzenes in methanol–water. The temperature dependence of the separation factor indicated that the selectivity increased with the molecular orientation of ODA n. Effect of carbonyl–p interaction due to the acrylate moiety on the selectivity was examined using seven kinds of p-substituted phenylazobenzenes with various Hammett’s substituent constants.
Посилання на статтю:
Crystalline polymer on silica. Geometrical selectivity for azobenzenes through highly-oriented structure / Hirotaka Ihara, Takashi Sagawa, Yoshihiro Goto, Shoji Nagaoka // Polymer. – 1999. – N 40. – P. 2555–2560.