An arylhydrazido(2–) complex of tungsten with a distinctly bent W–N–N skeleton. X-Ray crystal structure of biscyclopentadienylhydrido-p-fluorophenylhydrazido(2–)tungsten hexafluorophosphate acetone solvate [(η5-C5H5)2WH(p-NNHC6H4F)][PF6]·Me2CO

Abstract

The title complex, synthesized by the insertion of p-fluorobenzenediazonium ion into one W–H bond in (η⁵-C₅H₅)₂WH₂ below –20 °C, has been shown by a single-crystal X-ray structure determination at –100 °C to contain a formally p-fluorophenylhydrazido(2–) ligand co-ordinated with a distinctly bent W–N(1)–N(2) skeleton [angle at N(1) 146·3(6)]; this ligand is oriented such as to make the two η⁵-C₅H₅ groups non-equivalent, consistent with the ground-state conformation in solution deduced from the low-temperature ¹H n.m.r. spectrum.