Synthesis and structural studies of complexes of niobium(III) chloride with ditertiary phosphines

Abstract

Several new hepta-coordinate dimeric complexes of niobium- (III) chloride with ditertiary phosphines of the type (C₆H₅)₂-P-(CH₂)_n-P-(C₆H₅)₂ (where n = 1 to 6) and (C₆H₅)₂-P-(CH = CH)-P-(C₆H₅)₂ have been prepared by using magnesium turnings and aluminium powder as reducing agents. These complexes are characterised by elemental analysis, magnetic moment data, IR, ¹H, ³¹P and ¹³C NMR spectral studies. The complexes formed are of the type Nb₂Cl₆<img src='http://www.niscair.res.in/jinfo/equation34.gif' border=0>₂, where <img src='http://www.niscair.res.in/jinfo/equation34.gif' border=0> represents the corresponding phosphine.