Abstract
The photolysis of mixed ligand complexes of the type ML n (N 3) 2 (MNi, Pd, Pt; L = phosphane and diphosphane ligands, respectively; n = 1, 2) was monitored by electronic spectroscopy in absorption, emission and excitation. Initial quantum yields of these complexes were measured in CH 2Cl 2 and EtOH in dependence on the irradiation wavelength. Photochemically formed M OI n fragments of Pd and Pt are distinguished by an intensive emission detected at 77 K. No emission was observed with respect to the appropriate Ni O fragments. An initial emission at 615 nm detected by irradiating Pd(PPh 3) 2(N 3) 2 at 77 K is explained by assuming a photochemical cis/trans isomerization Quenching experiments have been performed by using Ru(bpy) 3Cl 2, Os(bpy) 3Cl 2, Re(CO) 3(phen)Cl and Cr(bpy) 3(ClO 4) 3 as sensitizers and the mixed-ligand complexes under discussion as quenchers.
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