Craig C. McLauchlan1, Bradley A. Greiner1, Nicholas M. Marshall1, and Amy A. Narducci Sarjeant2. (1) Illinois State University, Normal, IL, (2) Johns Hopkins University, Baltimore, MD
Nitrogen containing heterocyclic ligands are a topic of much interest to those interested in modeling biological systems including histidine and its imidazole-1 type bonding. Many proteins and enzymes are known to contain active sites with multiple histidine residues bound to a metal center, including, among others, the long studied carbonic anhydrase. These enzymes have been shown to contain three histidine residues bound to a metal center in a distorted tetrahedral or facial octahedral geometry, conducive for model complexes with a tridentate ligand system. Despite the fact that an imidazole may be more biologically relevant, multiple studies have been conducted on the pyrazole containing scorpionate ligand Tp-, [(C3H3N2)3BH]-, and the neutral analogue tris(pyrazol-1-yl)methane, Tpm. In the course of our investigations of metal coordination complexes with tridentate ligands as model complexes for His3-containing enzymes, we investigated the tris[2-imidazolyl] carbinol, tris [2-(N-methylimidazolyl)] carbinol, and tris[4-imidazolyl] carbinol systems in addition to the Tp complexes. Here we report the structural characterization a series of bis[tris [2-(N-methylimidazolyl)] carbinol]metal and bis[tris(2-imidazolyl) carbinol] metal complexes with M=Co, Ni.
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