Complexes of TaLCl3 and TaSCl3 with neutral N- and O-donor ligands - Synthesis, properties and comparison with the niobium analogues

摘要

The white complexes, [TaOCl3(OPPh3)(2)], [TaOCl3(L-L)](L-L = 1,10-phenanthroline, 2,2'-bipyridyl, Ph2P(0) CH2P(O)Ph-2, Ph2P(PO)CH2CH2P(O)Ph-2 and o-C6H4(P(O)Ph-2)(2)), have been prepared from TaCl5, O(SiMe3)(2) and the ligands in anhydrous CH2Cl2 solution. The corresponding yellow [TaSCl3(OPPh3)(2)] and [TaSCl3(L-L)] were made similarly using S(SiMe3)(2). The complexes have been characterised by microanalysis, IR and NMR (H-1, P-31}) spectroscopy. X-ray crystal structures have been obtained for [TaOCl3(1,10-phen)], [TaSCl3(1,10-phen)], TaOCl3{o-C6H4(P(O)Ph-2)(2)}], [TaSCl3(OPPh3)(2)], [TaSCl3(Ph2P(O)CH2CH2P(O) Ph2)] and [TaSCl3(MeCN)(2)], which all contain mer-chlorines and with the neutral ligands trans to O/Cl or S/Cl. The structure of the Ta(V) dimer [Cl2S(1,10-phen)Ta(mu-0)Ta(1,10-phen)SCl2], formed by trace hydrolysis, is also reported. Comparisons between the complexes of TaOCl3 and TaSCl3 and their niobium analogues are discussed. (C) 2019 The Authors. Published by Elsevier Ltd.