ESR Study of Active Radicals Produced in the Photolysis of Substituted Titanolene Dichloride And DI-π-Cyclopenladienyldienyl Titanium Complexes

The active radicals produced in the photolysis of substituted titanolene dichloride and di-π-cyclopen-ladienyldienyl titanium complexes (（RC₅H₄） 2Ti-Cl₂, R=CH₃, C₂H₅, C₃H₇, C₅H₁₁, C₆H₁₁ and R=C₂H₅, n-C₄H₉, 2-MeC₆H₄, 4-MeC₆H₄, 2, 4-Me2C₆H₃, 2, 4, 6-Me3C₆H₂) have been studied by combination of spin trapping technique with ESR spectroscopy. Results show that the primary process of the photolysis is the homolysis of Ti-RC₅H₄ bond with the formation of Ti-center radical which can be easily trapped by phenanthroquinone and （RC₅H₄） radical which could not be directly trapped by nitrosodurene （ND）, because it may abstract the hydrogen from solvent RH, such as toluene, isopropylbenzene or cyclohexane, and form radical R. which can be trapped by ND, except in benzene solution.