Organometallic complexes pyridine

Finally, Alexander Sadimenko (University of Fort Hare, South Africa) has provided another fine contribution in his comprehensive coverage of organometallic complexes of heterocycles this one deals with pyridines and benzpyridines. 

This is, as expected, the rarest oxidation state as far as non-organometallic complexes of rhenium are concerned. The dirhenium phosphite complex Re2[P(OMe)3]10 has been prepared12,13 in low yield by several methods, viz. the potassium-potassium iodide reduction of ReOCl3(py)2 or an ReCLj-pyridine complex, followed by treatment with trimethyl phosphite. This yellow complex displays a 31P H) NMR spectrum that appears as a first order AB4 pattern, and is isoelectronic with Re2(CO)l0. It reacts with H2 upon photolysis in THF solution to produce hydridorhenium(III) and other species.13 The related triphenyl phosphite derivative Re2[P(OPh)3]l0 has been described14 as a product of the reaction between ReH3(PPh3)4 and P(OPh)3. 

Very often, amine complexes are designed to illustrate some subtle mechanistic see Mechanisms of Reaction of Organometallic Complexes) or stereochemical effect in coordination chemistry and much effort has been exercised in the design of specific amine ligands. For example, the reaction shown in equation (7) is very sensitive to steric effects, and the introduction of a pyridine ligand in place of an... 

Alkaline earth metals NHj. pyridine and other Lewis base molecules Transition metals Organometallic complexes... 

Organometallic Complexes of Polypyridine Ligands V Their Analogues, and N,0(S)-Chelating Pyridines... 

Sadimenko, A. P., Organometallic Complexes of Pyridines and Benzannualated Pyridines, 86, 293. 

Organometallic complexes of the rj (n,c)-coordinated derivatives of pyridine 05AHC(88)m. 

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