Crystallization and characterization of the compounds Gly路MSO4路mH2O (M = Mg2+, Mn2+, Fe2+, Co2+, Ni2+, Zn2+; m = 0, 3, 5, 6)
- 作者：S. Tepavitcharovaa ; stepav@svr.igic.bas.bg ; D. Rabadjievaa ; D. Havlí ; 膷ekb ; I. N臎mecb ; P. Vojtí ; &scaron ; ekb ; J. Plocekc ; Z. Kolevaa
- 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MSO4路5H2O with a structure derived from those of the crystallized double salts MSO4路xH2O, where x = 6, 7 was predicted and proven in the systems Gly-MSO4-H2O (M = Mg2+, Mn2+, Fe2+, Co2+, Ni2+ and Zn2+). It was predicted that stable octahedral complexes [M(H2O)6]2+ and trans-[M(H2O)4(O-gly)2]2+, as well as [SO4]2鈭?/sup> tetrahedra, which were the main building units of the crystallizing Gly路MSO4路5H2O 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MSO4路5H2O compounds (M = Mg2+, Co2+, Zn2+) 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 MnSO4路H2O (308 K) crystallizes, the only complex compound is the anhydrous Gly路MnSO4 with a polymeric type structure .
A new compound Gly路CoSO4路3H2O was found in the cobalt system under unstable equilibrium conditions. Gly路CoSO4路3H2O was proven to consist of two types of octahedra, trans-[Co(H2O)4(O-gly)2]2+ and trans-[Co(H2O)2(SO4)2(O-gly)2]2鈭?/sup>, forming a chain structure (monoclinic crystal system, space group P21/c).