亜硝酸還元酵素活性中心モデル錯体の構造化学（2）－CubpaBzNO2 錯体のＸ線結晶構造解析

概要

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The crystal structure of a model complex for the active center in nitrite reductase、[Cu(II)(bis(2-pyridylmethyl)benzylamine)NO2.ClO4]2 has been determined by X-ray diffraction method at －170 degrees centigrade. The molecule has dimeric structure related by the crystallographic center of symmetry. The copper atom has the square bipyramidal coordination geometry with three nitrogen atoms in approximately planar bpa ligand (bpa; bis(2-pyridylmethyl)amine), two oxygen atoms in nitrite ion (NO2－), and an oxygen atom in nitrite ion of another half of the molecule. The cation - Ⅱ interaction was found between copper atom and benzyl substituent resulting the long interatomic distances of Cu1－O2 = 2.698(3) and Cu2－O8 = 2.861(3) Å. Based on these distances, the nitrite ion is concluded to take end on coordination mode.
2009-08-01