Crystallization and characterization of the compounds Gly路MSO<sub>4sub>路mH<sub>2sub>O (M = Mg<sup>2+sup>, Mn<sup>2+sup>, Fe<sup>2+sup>, Co<sup>2+sup>, Ni<sup>2+sup>, Zn<sup>2+sup>; m = 0, 3, 5, 6)
- 作者：S. Tepavitcharova<sup>asup><sup> ; sup><sup>stepav@svr.igic.bas.bgsup> ; D. Rabadjieva<sup>asup> ; D. Havlí ; 膷ek<sup>bsup> ; I. N臎mec<sup>bsup> ; P. Vojtí ; &scaron ; ek<sup>bsup> ; J. Plocek<sup>csup> ; Z. Koleva<sup>asup>
- 关键词：Gly· ; MSO4· ; 5H2O ; Gly· ; CoSO4· ; 3H2O ; Crystal structure ; Vibrational spectra ; Thermal behavior ; Magnetic behavior
- 刊名：Journal of Molecular Structure
- 出版年：2012
- 期刊代码：62_00222860
- 类别：ch
- 出版时间：27 June, 2012
- 卷：1018
- 期：Complete
- 页码：113-121
- 文件大小：496 K
摘要
The equilibrium crystallization of complex compounds of the type Gly路MSO<sub>4sub>路5H<sub>2sub>O with a structure derived from those of the crystallized double salts MSO<sub>4sub>路xH<sub>2sub>O, where x = 6, 7 was predicted and proven in the systems Gly-MSO<sub>4sub>-H<sub>2sub>O (M = Mg<sup>2+sup>, Mn<sup>2+sup>, Fe<sup>2+sup>, Co<sup>2+sup>, Ni<sup>2+sup> and Zn<sup>2+sup>). It was predicted that stable octahedral complexes [M(H<sub>2sub>O)<sub>6sub>]<sup>2+sup> and trans-[M(H<sub>2sub>O)<sub>4sub>(O-gly)<sub>2sub>]<sup>2+sup>, as well as [SO<sub>4sub>]<sup>2鈭?/sup> tetrahedra, which were the main building units of the crystallizing Gly路MSO<sub>4sub>路5H<sub>2sub>O compounds (triclinic crystal system, space group P 鈭?#xA0;1), were predominating in these solutions. The vibrational spectra and the thermal behavior of the Gly路MSO<sub>4sub>路5H<sub>2sub>O compounds (M = Mg<sup>2+sup>, Co<sup>2+sup>, Zn<sup>2+sup>) are in accord with the refined crystal structures. The cobalt compound displays antiferromagnetic behavior whereas the nickel and manganese compounds are ferromagnetic.
In the manganese system where MnSO<sub>4sub>路H<sub>2sub>O (308 K) crystallizes, the only complex compound is the anhydrous Gly路MnSO<sub>4sub> with a polymeric type structure .
A new compound Gly路CoSO<sub>4sub>路3H<sub>2sub>O was found in the cobalt system under unstable equilibrium conditions. Gly路CoSO<sub>4sub>路3H<sub>2sub>O was proven to consist of two types of octahedra, trans-[Co(H<sub>2sub>O)<sub>4sub>(O-gly)<sub>2sub>]<sup>2+sup> and trans-[Co(H<sub>2sub>O)<sub>2sub>(SO<sub>4sub>)<sub>2sub>(O-gly)<sub>2sub>]<sup>2鈭?/sup>, forming a chain structure (monoclinic crystal system, space group P2<sub>1sub>/c).