Crystal structures and spectral properties of new Cd(II) and Hg(II) complexes of monensic acid with different coordination modes of the ligand

被引:22
作者
Ivanova, Juliana [1 ]
Pantcheva, Ivayla N. [2 ]
Mitewa, Mariana [2 ]
Simova, Svetlana [3 ]
Mayer-Figge, Heike [4 ]
Sheldrick, William S. [4 ]
机构
[1] Univ Sofia, Fac Med, Sofia 1164, Bulgaria
[2] Univ Sofia, Fac Chem, Sofia 1164, Bulgaria
[3] Bulgarian Acad Sci, Inst Organ Chem, Ctr Phytochem, BU-1113 Sofia, Bulgaria
[4] Ruhr Univ Bochum, Dept Analyt Chem, D-44780 Bochum, Germany
来源
CENTRAL EUROPEAN JOURNAL OF CHEMISTRY | 2010年 / 8卷 / 04期
关键词
Monovalent polyether ionophore; Heavy metal complexes; COLLISION-INDUCED DISSOCIATION; TANDEM MASS-SPECTROMETRY; MOLECULAR-STRUCTURE; IONOPHORE-MONENSIN; ELECTROSPRAY-IONIZATION; ANTIBIOTIC MONENSIN; CATION COMPLEXES; SODIUM MONENSIN; FRAGMENTATION; INTOXICATION;
D O I
10.2478/s11532-010-0067-2
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The single crystal X-ray structures and the spectroscopic properties of complexes of monensic acid (C36H62O11 center dot H2O) with toxic metal ions of Cd(II) and Hg(II) are discussed. The cadmium(II) complex (1) is of composition [Cd(C36H61O11)(2)(H2O)(2)] and crystallizes in the monoclinic system (space group P2(1), Z = 2) with a = 12.4090(8), b = 24.7688(16), c = 14.4358(11) angstrom, beta = 91.979(7)degrees. Two ligand monoanions are bound in a bidentate coordination mode to Cd(II) via the carboxylate and the primary hydroxyl oxygens occupying the equatorial plane of the complex. The axial positions of the inner coordination sphere of Cd(II) are filled by two water molecules additionally engaged in intramolecular hydrogen bonds. The Hg(II) complex (2), [Hg(C36H60O11)(H2O)], crystallizes in the orthorhombic system (space group P2(1) 2(1) 2(1), Z = 4) with a = 12.7316(2), b = 16.4379(3), c = 18.7184(4) angstrom. The monensic acid reacts with Hg(II) in a tetradentate coordination manner via both oxygen atoms of the carboxylate function and oxygens of two hydroxyl groups. The twofold negative charge of the ligand is achieved by deprotonation of carboxylic and secondary hydroxyl groups located at the opposite ends of the molecule. Hg(II) is surrounded by five oxygen atoms in a distorted square pyramidal molecular geometry.
引用
收藏
页码:852 / 860
页数:9
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