4,4′-Dimethyl-2,2′-bithiazole: Potent co-former in coordination compounds

چکیده مقاله

The ability of the 4,4′-dimethyl-2,2′-bithiazole (4dm2bt) ligand to act as a second-sphere co-former in coordination compounds is investigated through the preparation of a series of iron complexes. In this regard, the self-assembly process of FeCl₃·6H₂O or FeCl₃in the presence of several N-N′-chelating ligands and 4dm2bt was investigated. The complexes [Fe(bipy)(H₂O)Cl₃][4dm2bt] (1), [Fe(bipy)(CH₃OH)Cl₃][4dm2bt]_0.5(2), {[Fe(4,4′-dmbipy)₃][FeCl₄]₂}[4dm2bt]_0.5(3), {[Fe(phen)₂Cl₂][FeCl₄]}[4dm2bt]_0.5(4) and {[Fe(5-mephen)₂Cl₂][FeCl₄]}[4dm2bt]_0.5(5), which contain the 4dm2bt co-former, were prepared (bipy = 2,2′-bipyridine, 4,4′-dmbipy = 4,4′-dimethyl-2,2′-bipyridine, phen = 1,10-phenanthroline, 5-mephen = 5-methyl-1,10-phenanthroline). The driving forces for the presence of 4dm2bt as a second-sphere co-former ligand are not only several types of non-covalent interactions with the first-sphere coordination ligands or counter anions, but also its low coordination ability for participating as a primary ligand in comparison with the N-N′-chelating ligands used. © 2016 Elsevier Ltd