Old City Publishing/De Gruyter
Under 254 nm irradiation cis-[Pt(C6H5CN)2Cl2] is converted to H2PtCl6. Absorption of light by both the metal complex and the solvent contribute to the first step of this process, suggested to form HPt(C6H5CN) Cl3. A linear dependence of the reaction rate on light intensity appears to rule out chlorination by trichloromethyl radicals. However, at higher light intensities a higher order dependence on intensity develops, and under 313 nm irradiation is dominant, and a reaction between trichloromethyl radical and the excited state complex is proposed to account for this.
Eric M. Jaryszak, Son L. Phan, and Patrick E. Hoggard, "Kinetics of the photosubstitution of cis-bis(benzonitrile)dichloroplatinum(II) in chloroform", Inorg. React. Mech. 1, 129-136 (1999). http://doi.org/10.1515/irm-1999-0206