Bisbidentated ligands

Bimetallic polymers based on Mn(II)-Cu(II), with bisbidentated ligands. 

Well-defined and readily soluble ruthenium coordination polymers (61) have been synthesized through the reaction of a bisbidentate ligand and a metal center that already possesses one bidentate ligand (189-191). In these complexes, the random stereospecificity at the ruthenium centers results in a ribbon-like conformation of the polynners with the extension of the chain dependent upon the substituent R. The Ru centers appear to behave independently and the polymers appear to be stable against heat and uv irradiation. They have molecular weights on the order of Mw = 40,000-50,000. 

For Type 3 ligands, e.g., (97), two coordination modes have been found. Almost all the complexes adopt a N—N single bond bridging, bisbidentate mode (mode 1, Figure 8),75-82 with one exception in a vanadyl (V02+) complex of (97) in which the ligand adopts a nonbridging mode (mode 2, Figure 9).74... 

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