Triangulo-pentahalotrimetal complexes of nickel(II) and cobalt(II) with N,N,N ',N ',N-tetrametbylethane-1,2-diamine and related compounds

Nickel(ll) and cobalt(II) form complexes [M3Cl5(neutral didentate ligand)(3 )](+) containing the triangulo-trihalotrimetal moieties with considerable c ase, and they are very similar in structure to the known titanium, vanadium , and iron homologues. However, chromium and copper are not. The supporting neutral ligand is almost invariably N,N,N',N'-tetramethylethane-1,2-diamin e. These compounds show a great affinity fur water and react to lose one ap ical chloride to be replaced by hydroxide. The analogous bromide derivative s have also been prepared and characterised. For the first time, a triangul o-trihalotrimetal compound containing fluoride has also been prepared. (C) 2001 Elsevier Science B.V. All rights reserved.