Reactions of tricarbonylpyridine complexes (NN)(py)M(CO)3 (M = Mo, W; NN = 2,2′-bipyridine, 1,10-phenanthroline) with mercuric derivatives HgX2 (X = Cl, CN, SCN)

Treatment of mercury(II) halides and pseudohalides with complexes (NN)(L)M(CO)₃ (L = py; NN = 2,2′-bipyridine (bipy), 1,10-phenanthroline (phen); M = Mo, W) gives new tricarbonyl complexes. In all cases elimination of the pyridine ligand occurs and in some cases there is partial displacement of halogen from the mercuric halide. Treatment of bipy(py)W(CO)₃ with mercuric chloride gives only an adduct. Conductivity, IR and electronic absorption are given, and possible formulations suggested.     

Synthesis and Structures of Bis(alkene) Complexes of Tungsten and Molybdenum, [M(CO)2(dpphen)(dbf)2] (M = W or Mo; dpphen = 4,7‐diphenyl‐1,10‐phenanthroline; dbf = dibutylfumarate)

Tungsten and molybdenum complexes [M(CO)₂(dpphen)(dbf)₂] (M = W 1 or Mo 2 ; dpphen = 4,7‐diphenyl‐1,10‐phenanthroline; dbf = dibutylfumarate) have been synthesized and structurally characterized by X‐ray diffraction analysis. In both complexes which have similar structure, the metal atom co‐ordination is distorted octahedral with dpphen and two CO groups in the equatorial plane and the metal atom binds in an η²‐fashion to the C–C bonds of two dbf ligands. The two C–C bonds are almost mutually orthogonal. The two complexes are different in conformation which result from face selection of the two dbf ligands for coordination to the metal atom.