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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Ligand field theory ： ウィキペディア英語版 Ligand field theory Ligand field theory (LFT) describes the bonding, orbital arrangement, and other characteristics of coordination complexes.〔Schläfer, H. L.; Gliemann, G. "Basic Principles of Ligand Field Theory" Wiley Interscience: New York; 1969〕 It represents an application of molecular orbital theory to transition metal complexes. A transition metal ion has nine valence atomic orbitals - consisting of five ''n''d, one (''n''+1)s, and three (''n''+1)p orbitals. These orbitals are of appropriate energy to form bonding interaction with ligands. The LFT analysis is highly dependent on the geometry of the complex, but most explanations begin by describing octahedral complexes, where six ligands coordinate to the metal. Other complexes can be described by reference to crystal field theory.〔G. L. Miessler and D. A. Tarr “Inorganic Chemistry” 3rd Ed, Pearson/Prentice Hall publisher, ISBN 0-13-035471-6.〕 ==History== Ligand field theory resulted from combining the principles laid out in molecular orbital theory and crystal field theory, which describes the loss of degeneracy of metal d orbitals in transition metal complexes. Griffith and Orgel〔Griffith, J.S. and L.E. Orgel. ("Ligand Field Theory". ) ''Q. Rev. Chem. Soc.'' 1957, 11, 381-383〕 championed ligand field theory as a more accurate description of such complexes. They used the electrostatic principles established in crystal field theory to describe transition metal ions in solution, and they used molecular orbital theory to explain the differences in metal-ligand interactions. In their paper, they propose that the chief cause of color differences in transition metal complexes in solution is the incomplete d orbital subshells.〔 That is, the unoccupied d orbitals of transition metals participate in bonding, which influences the colors they absorb in solution. In ligand field theory, the various d orbitals are affected differently when surrounded by a field of neighboring ligands and are raised or lowered in energy based on the strength of their interaction with the ligands.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ligand field theory」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.