[NH3(CH2)2NH3][Co(SO4)2(H2O)4]:: Chemical preparation, crystal structure, thermal decomposition and magnetic properties

被引：38
|
作者：
Rekik, Walid [2 ]
Naili, Houcine [2 ]
Mhiri, Tahar [2 ]
Bataille, Thierry [1 ]
机构：
[1] Univ Rennes 1, CNRS, UMR 6226, Grp Mat Inorgan Chim Douce & Reactiv, F-35042 Rennes, France
[2] Fac Sci, Dept Chim, Lab Etat Solide, Sfax 3018, Tunisia
来源：
MATERIALS RESEARCH BULLETIN | 2008年 / 43卷 / 10期
关键词：
inorganic compounds; chemical synthesis; thermogravimetric analysis; X-ray diffraction; phase transitions;
D O I：
10.1016/j.materresbull.2007.10.024
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Cobalt ethylenediammonium bis(sulfate) tetrahydrate, [NH3(CH2)(2)NH3][CO(SO4)(2)(H2O)(4)], has been synthesised by slow evaporation at room temperature. It crystallises in the triclinic system, space group P1, with the unit cell parameters: a = 6.8033(2), b = 7.0705(2), c = 7.2192(3) angstrom, alpha = 74.909(2)degrees, beta = 72.291(2)degrees, gamma = 79.167(2)degrees, Z = 1 and V = 317.16(2) angstrom(3). The Co(II) atom is octahedrally coordinated by four water molecules and two sulfate tetrahedra leading to trimeric units [Co(SO4)(2)(H2O)(4)]. These units are linked to each other and to the ethylenediammonium cations through OW-H...O and N-H...O hydrogen bonds, respectively. The zero-dimensional structure is described as an alternation between cationic and anionic layers along the crystallographic b-axis. The dehydration of the precursor proceeds through three stages leading to crystalline intermediary hydrate phases and an anhydrous compound. The magnetic measurements show that the title compound is predominantly paramagnetic with weak antiferromagnetic interactions. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2709 / 2718
页数：10
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