Stereoselective formation of cobalt(II), nickel(II) and zinc(II) chelates of histidine |
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| Affiliation: | 1. Physics Department, Shahrood University of Technology, Shahrood, Iran;2. Iranian National Center for Laser Science and Technology, Tehran, Iran;1. Department of Communication Engineering, Okayama Prefectural University, 111 Kuboki, Soja-shi, Okayama 719-1197, Japan;2. Technology, GlobalWafers Japan Co., Ltd., 6-861-5 Higashiko, Seiro, Niigata 957-0197, Japan;3. Department of Solid State Sciences, Ghent University, Krijgslaan 281-S1, Ghent B-9000, Belgium;1. Department of Chemistry, Federal University of Mato Grosso, Cuiabá 78060-900, MT, Brazil;2. Chemistry Institute, State University of Campinas, POB 6154, Campinas 13084-971, SP, Brazil;1. Department of Biology, The Pennsylvania State University, University Park, PA 16802, United States;2. Center for Infectious Disease Dynamics, The Pennsylvania State University, University Park, PA 16802, United States;3. Center for Vaccines and Immunity, Nationwide Children’s Hospital, 700 Children’s Drive, Columbus, OH 43205, United States |
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| Abstract: | Formation of the 2: 1 histidine complexes of cobalt(II), nickel(II), and zinc(II) is stereoselective, the mixed D, L-complexes being preferred over the unmixed L, L-complexes, in aqueous solutions. Analysis of titration data indicates that the racemic cobalt(II), nickel(II) and zinc(II) complexes are favored by 12, 22, and 13 per cent respectively, over what is expected statistically. The stereoselectivity observed for the zinc(II) complexes suggests that they possess octahedral characteristics in aqueous solution. No stereoselectivity is observed in the cadmium(II) and copper (II) bis complexes of histidine, nor in the nickel(II) and copper(II) bis complexes of 2,3-diaminopropionic acid. Stereoselectivity appears to be dependent upon the presence of a bulky side chain in a tridentate ligand chelated to a small metal ion. |
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