Identification of different Cr(III) nta complexes:: crystallisation of Cs2[Cr2(nta)2(μ-OH)2]•4H2O in two space groups

被引：35
|
作者：
Visser, HG [1 ]
Purcell, W [1 ]
Basson, SS [1 ]
机构：
[1] Univ Orange Free State, Dept Chem, ZA-9300 Bloemfontein, South Africa
来源：
POLYHEDRON | 1999年 / 18卷 / 21期
关键词：
synthesis; identification; crystal structure; chromium (III); nitrilotriacetate dimer;
D O I：
10.1016/S0277-5387(99)00198-9
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Cs-2[Cr-2(nta)(2)(mu-OH)(2)]. 4H(2)O (nta=nitrilotriacetate) crystallises in two different space groups due to a slight variation in pH of the reaction mixtures. The structures of Cs-2[Cr-2(nta)(2)(mu-OH)(2)]. 4H(2)O have been determined from three-dimensional X-ray diffraction data. The complex crystallises in the tetragonal, 14(1)/a (I) and monoclinic, P2(1)/c (II), space groups. The two hydroxo groups bridge the two Cr centres with OH-Cr-OH angles of 81.5(3)degrees (I) and 82.08(10)degrees (II), respectively. The tetradentate nta ligand completes the octahedral geometry around the Cr centre. The Cr-OH bonds are 1.942(7) and 1.961(6) Angstrom for (I) and 1.987(2) and 1.991(1) Angstrom for (II). The Cr-N and Cr-O-(av) are 2.048(9) and 1.967(8) Angstrom for (I) and 2.061(3) and 1.975(2) Angstrom for (II), respectively. (C) 1999 Elsevier Science Ltd. All rights reserved.
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页码：2795 / 2801
页数：7
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