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Synthesis, structural studies and solubility properties of zinc(II), nickel(II) and copper(II) complexes of bulky tris(triazolyl)borate ligands |
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| Authors: | Jessica L. Bongiovanni Patrick T. Fadden Kirsten R. Wells Elizabeth T. Papish Glenn P.A. Yap |
| Affiliation: | a Department of Chemistry, Drexel University, 3141 Chestnut St., Philadelphia, PA 19104, United States b Salisbury University, 1101 Camden Ave., Salisbury, MD 21801, United States c University of Delaware, Newark, DE 19716, United States d Youngstown State University, 1 University Plaza, Youngstown, OH 44555, United States |
| Abstract: | Tris(triazolyl)borate (Ttz) ligands are sterically similar to tris(pyrazolyl)borate (Tp) but complexes of Ttz show improved solubility in water and alcohols due to their propensity for forming hydrogen bonds. Recently developed bulky tris(triazolyl)borate ligands can produce four and five coordinate transition metal complexes and serve as models for enzyme active sites in an aqueous environment. Herein we report the synthesis of such complexes, i.e. (TtztBu,Me)ZnCl, (TtztBu,Me)ZnBr, (TtztBu,Me)NiCl, and (TtztBu,Me)CuCl, which were analyzed by X-ray crystallographic and spectroscopic methods [TtztBu,Me = tris(3-t-butyl-5-methyl-1,2,4-triazolyl)borate]. (TtztBu,Me)ZnCl crystallizes as two different polymorphs with cubic and monoclinic symmetry. Both polymorphs of (TtztBu,Me)ZnCl and (TtztBu,Me)ZnBr have tetrahedral zinc atoms whereas the geometries at the metal in (TtztBu,Me)NiCl and (TtztBu,Me)CuCl are distorted tetrahedral. All complexes are methanol soluble and they also dissolve in methanol/water mixtures with up to 60% water. |
| Keywords: | Water-soluble ligands Triazole Tris(triazolyl)borate Bioinorganic models Transition metals |
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