Seven-coordinate complexes of molybdenum(II) and tungsten(II) containing pyridine-2-thionate and pyrimidine-2-thionate. Crystal structure of 2-pymS)2> (pymS = pyrimidine-2-thionate)

Article abstract of DOI:10.1016/0022-328X(95)05532-T

Reaction of with two equivalents of K (pymS=pyrimidine-2-thionate) has given the crystallographically characterized complex 2-pymS)2> (1). The structure can be described as a distorted monocapped trigonal prims with a carbonyl ligand in the unique capping position.Equimolar quantities of and L (for M=Mo or W, L=PPh3; for M=W only, L=PPh2Cy or PPh2Nap (Nap=napthyl)> react to give , followed by reaction in situ with K (pyS=pyridine-2-thionate) afforded the complexes 2-pyS or pymS)> (2-7).The tungsten complexes (prepared in situ) react with an equimolar amount of K to give the S-monodentately coordinated pyramidine-2-thionate complexes 1-S-pymS)> (8-15).Similarly, treatment of > (n=1-6) (prepared in situ) with one equivalent of K or K yielded the monodentately attached pyrimidine-2-thionate or pyridine-2-thionate complexes 1-S-pyS or -S-pymS)> (16-27).The molybdenum complex > (prepared in situ) reacts with an equimolar amounts of K to give the bidentately coordinated pyrimidine-2-thionate dicarbonyl complex (η²-pymS)> (28).Keywords: Molybdenum(II); Tungsten(II); Seven-coordinate; Pyridine-2-thionate; Pyrimidine-2-thionate; Crystal structure