| Popis: |
Interaction of arenecarbonylchromium π-complexes, XArCr(CO) 2 L (L = CO, PPh 3 and X = H, 3(CH 3 ), OCH 3 , COOCH 3 and COCH3) with visible light was investigated by measurement of the electronic absorption spectra. These compounds were shown to interact with visible light via photodecay described by first order kinetics. It was shown that C 6 H 6 and Cr(CO) 6 are the products of the photodecay of C 6 H 6 Cr(CO) 3 . The substituents in the benzene ring (X = OCH 3 , 3(CH 3 ), COOCH 3 and COCH 3 ) had no essential effect upon the rate of decomposition of the complexes investigated, while substitution of a CO group in ArCr(CO) 3 by a PPh 3 ligand increased the rate of reaction by about an order of magnitude. The study of the dependence of the rate of reaction on the intensity of the incident light in the course of photodecomposition enabled us to propose a mechanism for the reaction. |
