Second- and third-row transition-metal complexes of dihydroxybenzoic acids, and the crystal structure of [NMe4]2[MoO2(2,3-dhb)2]·1.5H2O (2,3-H2dhb = 2,3-dihydroxybenzoic acid)

The new complexes [MO2L2]2–(H2L = 2,3- or 3,4-dihydroxybenzoic acid, 2,3-H2dhb or 3,4-H2dhb, M = Mo, W or Os; H2L = 2,6-dihydroxybenzoic acid, 2,6-H2dhb, M = Mo), [OsO2(py)2(2,6-dhb)](py = pyridine), [ReOl(PPh3)2L](H2L = 2,3-, 3,4- or 2,6-H2dhb) and [M(PPh3)2(2,3-dhb)](M = Pd or Pt) have been prepared. The crystal structure of [NMe4]2[MoO2(2,3-dhb)2]·1.5H2O has been determined and exhibits catecholato rather than salicylato type bonding. Infrared, Raman, 1H and 13C-{1H} NMR spectroscopic data for the complexes are also presented.