Preparation, characterisation, and X-ray crystal structure of [W2Cl4(NHBut)2(NH2But)2]: a triply-bonded ditungsten compound containing t-butylamido ligands
Abstract
Treatment of the dimer [W2Cl6(thf)4](thf = tetrahydrofuran) with excess t-butylamine caused the replacement of two chlorines by t-butylamide ligands and the formation of the new dimer [W2Cl4(NHBut)2(NH2But)2] which was characterised by n.m.r. spectroscopy and a single-crystal X-ray structure determination. The molecule has 222 (D2) symmetry, with disordering of the amide and amine ligands, and an eclipsed structure with strong Cl ⋯ H–N intermolecular bonding. The WW, W–Cl, and W–N distances are 2.288(3), 2.352(5), and 2.11(2)Å respectively.