title: Synthetic routes to mixed-ligand cobalt(III) dithiocarbamato complexes containing imidazole, amine and pyridine donors and the X-ray crystal structure of a cobalt(III) bis(dithiocarbamato) histamine complex.
abstract: The binuclear cobalt complex [Co(2)(Me(2)dtc)(5)](+) reacts with a range of nitrogen donor ligands L' or L'' to form an equimolar mixture of Co(Me(2)dtc)(3) and the mixed-ligand complexes [Co(Me(2)dtc)(2)(L')(2)](+) or [Co(Me(2)dtc)(2)(L'')](+), where (L')(2) is two monodentate ligands and (L'') is one bidentate ligand. The complexes prepared by this route contain the monodentate ligands L'=1-methyl-imidazole, 1-methyl-5-nitro-imidazole and benzimidazole, all of which coordinate to cobalt through an imidazole nitrogen atom. Symmetrical bidentate ligand complexes contain the bisimidazole L''=2,2'-bis(4,5-dimethylimidazole), the diamine L''=1,2-diaminobenzene and the pyridine donors L''=2,2'-bipyridine, 4,4'-dimethyl-2,2'-bipyridine and 1,10-phenanthroline. Two examples of complexes with unsymmetrical bidentate imidazole-amine donors were prepared in which L''=4-(2-aminoethyl)imidazole (histamine) and 2-aminomethylbenzimidazole. All new complexes were fully characterised, and the X-ray crystal structure of the histamine complex [Co(Me(2)dtc)(2)(hist)]ClO(4) is also reported.
authors.affiliation: Department of Chemistry, The University of Auckland, Private Bag 92019, Auckland, New Zealand.
authors.forename: Michael C
authors.initials: MC
authors.lastname: Hodgson
authors.forename: Penelope J
authors.initials: PJ
authors.lastname: Brothers
authors.forename: George R
authors.initials: GR
authors.lastname: Clark
authors.forename: David C
authors.initials: DC
authors.lastname: Ware
mesh_terms: D000588:Amines / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006632:Histamine / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D008024:Ligands; D008958:Models, Molecular; D011725:Pyridines / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013859:Thiocarbamates / Q000737:chemistry*
chemical_list: D000588:Amines; D007093:Imidazoles; D008024:Ligands; D011725:Pyridines; D013859:Thiocarbamates; D003035:Cobalt; D006632:Histamine; C023666:pyridine