PHOTOCHEMISTRY OF PLANAR 4-COORDINATE PALLADIUM(II) COMPLEXES .1. STERICALLY HINDERED NITRO(4-METHYL-1,1,7,7-TETRAETHYLDIETHYLENETRIAMINE)-PALLADIUM(II) COMPLEX ION

The photochemical behaviour of [Pd(MeEt4dien)NO2]+ (MeEt4dien = 4-methyl-1,1,7,7 tetraethyldiethylenetriamine) in methanol solution has been investigated. Under irradiation of different wavelengths corresponding mainly to CT and LF bands of the complex, the initial N-bonded PdNO2 compound undergoes a linkage photoisomerization to PdONO which in turn reacts photochemically and thermally with the solvent to give the final solvo-derivative [Pd(MeEt4dien)solv.]++. The quantum yields of the two photoreactions, the isomerization and the solvolysis, decrease with decreasing energy of the exciting radiations. A mechanism for both photoprocesses is proposed. © 1979.