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

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.