Detection of Intermolecular Interaction Between Pd(II) Complexes Having Imidate and Amine Ligands and Photochromic Dyes in Hybrid Solution Systems by Absorption and Fluorescence Spectra

Takashiro      Akitsu; Asuka      Yoshida

Abstract

In order to examine new spectroscopic properties about intermolecular interactions, we prepared four Pd(II) complexes, trans-[Pd(phent)2(R-phenea)2] (1), trans-[Pd(phent)2(R-phenea)(S-phenea)] (2), trans-[Pd(succim)2 (12diphenea)2] (3), and trans-[Pd(succim)2(CH3NH2)2] (4), and we detected intensity and shift of absorption and fluorescence spectra with some photochromic dyes, azobenzene (AZ), stilbene (ST), 4-[ethyl(2-hydroxyethyl)amino]-4- nitroazobenzene (DR1), 1,3,3-trimethylindolino-6- nitrobenzopyrylospiran (SP1), and 1,3,3-trimethylindolino-8- methoxybenzopyrilospiran (SP2), dissolved in several organic solvents before and after UV and visible light irradiation. Among them, a hybrid system of 4 and AZ in CHCl3 solution exhibited characteristic spectral enhancement by mixing at 320 nm of absorption spectra with a new peak emerging at 520 nm of fluorescence spectra accompanying by cis-trans photoisomerization of AZ.

Keywords: Absorption spectra, fluorescence spectra, photochromism, Pd(II) complexes, intermolecular interaction, azobenzene, stilbene, hybrid system, photoisomerization, deprotonated, succinimide, diphenylhydantoin, electronic states, cross-coupling reactions, organohallogen, oraganometallic compounds, conjugated structures