Organoosmium compounds

For 1,2,3-triazole, the Ti (N ), i-ti (N, N ), and Ti fC) carbene coordination modes prevail in organometallic compounds. Benzotriazole has the same general pattern but often operates as a composite unit of benzotriazole and benzotriazolate linked by the hydrogen bond. In some organoosmium compounds, the i-ti (N, ) mode is realized, where the C -center refers to the annulated benzene ring. In some variations, together with the i-ti (N, N ) mode, the Ti fN" ) monodentate coordination occurs. The I-ti (N, N ) mode can also be traced. 

Organoruthenium and organoosmium compounds of polypyridine ligands offer alternative coordination modes of these ligands. In the cyclometalated complexes the ri (Ni, C2) coordination mode occurs. In some clusters the ri (Ni, C2) donor function is manifested. The latter becomes possible in clusters of 4,4 -bipyridine ligands, which otherwise play their traditional bridging function. 

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