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Synthesis and Structural Determination of a Novel Heterometallic Complex [Sb 2 (edta) 2 ‐µ 4 ‐Co(H 2 O) 2 ]·5.15H 2 O
Author(s) -
Zhong Guoqing,
Shen Juan,
Jiang Qiying,
Yu Kaibai
Publication year - 2011
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201100394
Subject(s) - chemistry , ethylenediamine , monoclinic crystal system , crystallography , molecule , ion , coordination number , oxygen , crystal structure , differential scanning calorimetry , coordination complex , thermogravimetry , inorganic chemistry , metal , organic chemistry , physics , thermodynamics
Abstract The novel three‐dimension edta‐linked (edta=ethylenediamine‐ N , N , N ′, N ′‐tetraacetate) heterometallic complex [Sb 2 (edta) 2 ‐µ 4 ‐Co(H 2 O) 2 ]·5.15H 2 O has been synthesized and characterized by elemental analyses, FT‐IR spectrum, X‐ray diffraction analyses and thermogravimetry‐differential scanning calorimetry (TG‐DSC). The complex crystallizes in the monoclinic system, space group P 2 1 / n , lattice parameters: a =0.69969(2) nm, b =2.08705(4) nm, c =1.08106(2) nm, β =90.031(1)°, V =1.57866(6) nm 3 , Z =2, M r =1007.76, D c =2.120 g·cm −3 , F (000)=1001, µ =2.323 mm −1 , the final R =0.0235 and wR =0.0629 for 3480 observed reflections [ I >2 δ ( I )]. In the structure each Co(II) ion is connected with Sb(III) ions bridging by four carboxylic oxygen atoms, and in each [Sb(edta)] − anion, the Sb(III) ion is six coordinated by two nitrogen and four oxygen from edta ions, together with a lone electron pair at the equatorial position. In the complex, the coordination number of Co(II) ion is six and its coordination environment is composed of four carboxylic oxygen atoms from four different edta ions and two oxygen atoms from two H 2 O molecules. The degradation of the sample proceeds in several steps and the water molecules and ligands are successively emited.