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2-Methyl-or 2-benzyl-pyridine, and 1,2-, 1,3-, and 1,4-diazines all react like pyridine itself with [Os,(CO),,-(C8H14)2] (CBH14 = cyclo-octene) to give complexes of the type [0s3H(CO),,(p-L)] where L is a 2-metallated heterocycle. The H n.m.r. spectrum of the 2-benzylpyridine complex shows that p-L is in a locked configuration on the n.m.r. time-scale and does not alternate its bonding between the two 0 s atoms it bridges. 2,2'-Bipyridyl reacts with [OS~(CO)~ 2] to give the related red complex [Os3H (CO)9(C10H7N2)] which contains the chelating bridging 6-metallated bipy ligand as established by a single-crystal X-ray structure determination. The crystals are monoclinic, space group P2,/c, with a = 9.113( 2), b = 13.157(2), c = 18.209(2) A, p = 91.59(2)", and Z = 4. The structure was refined to R = 0.0427 for 3 550 observed reflections. The structure of [Os,H(CO)?-(C10H7N2)] is rather like those of compounds [OS,H(CO)~~X] and in particular where X = 2-pyridyl except that in the nonacarbonyl complex described here the ortho-metallated pyridine ring is part of a 2,2'-bipyridyl chelating ligand.

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