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).
                                    研究了[M 3 (CO) 12 ](M = Ru 1a 或 Os 1b)与氮杂环的光
化学作用。在所有情况下,光解都会导致光置换产物,杂环会抑制光破碎途径。1a 与
吡啶 (py) 形成正
金属化复合物 [Ru 3 H(CO) 10 (C 5 H 4 N)] 2a。用
锇可以分离出简单的取代产物[Os 3 (CO) 11 (py)]3b。用 2-
甲基吡啶(mby)分别从 1a 和 1b 生成 [Ru 3 H(CO) 10 (2-MeC 5 H 3 N)] 5a 和 [Os 3 (CO) 11 (mpy)] 6b。在 2,6-二
甲基吡啶中没有观察到净光反应。1a 和 1b 与 2,2′-联
吡啶光解后生成 [M 3 (CO) 10 (bipy)](M = Ru 7a 和 Os 7b)。通过单晶 X 射线衍射研究获得了 7b 的分子结构。1a 和 1b 与
哒嗪(pydz)发生光解反应,生成取代产物 [M 3 (CO) 10 (pydz)](M = Ru 8a 或 Os 8b)。