Studies of phosphazenes. Part 34. Group 6 metal carbonyl complexes of bis(pyrazolyl)cyclotriphosphazenes

Abstract

Reactions of the bis(3,5-dimethylpyrazol-1-yl)cyclotriphosphazenes gem-N₃P₃Ph₄(C₃HN₂Me₂)₂(L¹) and N₃P₃(MeNCH₂CH₂O)₂(C₃HN₂Me₂)₂(L²) with [M(CO)₆](M = Mo or W) afford complexes of the type [M(CO)₃ L](L = L¹ or L²), which have been characterised by IR and NMR spectroscopic data. The structures of [Mo(CO)₃ L¹], [W(CO)₃ L²] and the ligand L² have been determined by single-crystal X-ray diffraction. The phosphazenes act as novel tridentate NNN-donor ligands with two pyrazolyl nitrogen atoms and one phosphazene ring nitrogen atom bonded to the metal atom.