PHOTOCHEMISTRY OF RU3(CO)12 WITH NITROGEN HETEROCYCLES

The photochemistry of [M 3 (CO) 12 ] (M = Ru 1a or Os 1b) with nitrogen heterocycles has been studied. In all cases photolysis leads to photosubstitution products, the heterocycles inhibiting the photofragmentation pathway. With pyridine (py) 1a formed the orthometallated complex [Ru 3 H(CO) 10 (C 5 H 4 N)] 2a. With osmium, the simple substitution product [Os 3 (CO) 11 (py)] 3b can be isolated. With 2-methylpyridine (mpy) [Ru 3 H(CO) 10 (2-MeC 5 H 3 N)] 5a and [Os 3 (CO) 11 (mpy)] 6b were formed from 1a and 1b respectively. With 2,6-dimethylpyridine no net photoreaction was observed. Photolysis of 1a and 1b with 2,2′-bipyridine led to the formation of [M 3 (CO) 10 (bipy)] (M = Ru 7a and Os 7b). The molecular structure of 7b has been obtained by single-crystal X-ray diffraction studies. Photolysis of 1a and 1b with pyridazine (pydz) led to the substituted products [M 3 (CO) 10 (pydz)] (M = Ru 8a or Os 8b).

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