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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 Geometry index ： ウィキペディア英語版 Geometry index In structural chemistry and crystallography, the geometry index or structural parameter () is the number in a range 0...1 that indicates what the geometry of the coordination center is. The first such parameter for 5-coordinate compounds was developed in 1984. Later, parameters for 4-coordinate compounds were developed. ==5-coordinate compounds== File:Tau5 parameter for selected geometries.gif To distinguish whether the geometry of the coordination center is trigonal bipyramidal or square pyramidal, the (originally just ) parameter was proposed by Addison ''et al.'': :$\backslash tau\_5\; =\; \backslash frac\; \backslash approx\; -0.01667\backslash alpha\; +\; 0.01667\backslash beta$ where: are the two greatest valence angles of the coordination center. When is close to 0 the geometry is similar to square pyramidal, while if is close to 1 the geometry is similar to trigonal bipyramidal: |File:Trigonal-bipyramidal-3D-balls.png |alt2=Trigonal bipyramidal geometry |Trigonal bipyramidal geometry }} 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「Geometry index」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.