Choi Jong-Ha, Suzuki Takayoshi, Subhan Md Abdus, Kaizaki Sumio, Park Yu Chul
Department of Chemistry, Andong National University, Andong 760-749, South Korea.
Acta Crystallogr C. 2002 Jul;58(Pt 7):m409-12. doi: 10.1107/s0108270102009885. Epub 2002 Jun 29.
The crystal structure of the title compound, (C(2)H(10)N(2))Cr(C(4)H(9)N(2)O(2))(2)Cl(4) x 2H(2)O, has been determined by single-crystal X-ray diffraction studies at 293 and 100 K. The analyses demonstrated that the crystal consists of ethylenediammonium dications (which lie about inversion centres), bis[N-(2-aminoethyl)glycinato]chromium(III) monocations, Cl(-) anions and hydrate water molecules, in a molecular ratio of 1:2:4:2. The complex cation unit has a slightly distorted octahedrally coordinated Cr atom, with two Cr[bond]O and four Cr[bond]N bonds in the ranges 1.951 (1)-1.953 (1) and 2.054 (1)-2.089 (2) A, respectively, at 293 K. The geometry of the bis[N-(2-aminoethyl)glycinato]chromium(III) moiety was found to be trans,cis,cis with respect to the carboxylate O atom and the primary and secondary amine N atoms. The two analyses, at 293 and 100 K, exhibited no remarkable structural differences, although the colour of the crystals did differ, being red at 293 K and orange at 100 K.
通过在293 K和100 K下的单晶X射线衍射研究，确定了标题化合物（C₂H₁₀N₂）[Cr（C₄H₉N₂O₂）₂]₂Cl₄·2H₂O的晶体结构。分析表明，该晶体由乙二铵二价阳离子（位于对称中心）、双[N-(2-氨基乙基)甘氨酸根]铬(III)一价阳离子、Cl⁻阴离子和水分子组成，其分子比例为1:2:4:2。在293 K时，配合物阳离子单元中Cr原子的八面体配位略有扭曲，其中两个Cr—O键和四个Cr—N键的键长分别在1.951(1) - 1.953(1) Å和2.054(1) - 2.089(2) Å范围内。双[N-(2-氨基乙基)甘氨酸根]铬(III)部分相对于羧酸根O原子以及伯胺和仲胺N原子的几何构型为反式、顺式、顺式。尽管晶体颜色不同，293 K时为红色，100 K时为橙色，但在293 K和100 K下的两次分析显示结构没有明显差异。
