Alkylenedithiophosphato derivatives of niobium(V)

Abstract

Reactions of niobium(V) isopropoxide with various O,O'-alkylenedithiophosphoric acids in 1:1 molar ratio yield tetraisopropoxyniobium(V) alkylenedithiophosphates (PrⁱO)₄NbS_{2<img src='http://www.niscair.res.in/jinfo/equation3.gif' border=0>} (where G = - CMe₂CMe₂-, -CHMeCHMe-, -CH₂CMe₂CH₂- and -CH₂CEt₂CH₂-) as hydrolysable, pink-purple viscous liquids or solids, soluble in common organic solvents. Further replacement of isopropoxy group by these ligands to give disubstituted compounds does not occur even under forcing conditions. IR and NMR (^lH, ¹³C and ³¹P) spectra of the complexes indicate bidentate behaviour of dithiophosphate moieties endowing octahedral configuration on the complexes.