Complexes of the two geometrical isomers of pyridine-2-carbaldehyde 2′-pyridylhydrazone with group vi metal carbonyls and substituted carbonyls
Abstract
Compounds of the types M(CO)4L2 and Mo(CO)3L2Y have been prepared where M = Cr, Mo, and W, L2=Z-pyridine-2-aldehyde 2′-pyridylhydrazone and Y = PPh3, AsPh3, SbPh3, Ph3PSe and SO2. The E-isomer of the hydrazone can be stabilised in the compounds Mo(CO)4L2, Mo(CO)3L2(PPh3) and Mo(CO)2L2I2. Some results of the halogen oxidations of Mo(CO)4L2 where L2= either E- or Z-hydrazone are presented, compounds such as Mo(CO)3(L2)X2, where L2=Z-hydrazone and X = Br, I, and [L2H2]MoOX5, where X = Cl, Br, having been isolated.