Crystallization and characterization of the compounds Gly路MSO4路mH2O (M = Mgp>2+ p>, Mnp>2+ p>, Fep>2+ p>, Cop>2+ p>, Nip>2+ p>, Znp>2+ p>; m = 0, 3, 5, 6)
- 作者：S. Tepavitcharova
- 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m>x m>H2O, where m>x m> = 6, 7 was predicted and proven in the systems Gly-MSO4-H2O (M = Mgp>2+ p>, Mnp>2+ p>, Fep>2+ p>, Cop>2+ p>, Nip>2+ p> and Znp>2+ p>). It was predicted that stable octahedral complexes [M(H2O)6]p>2+ p> and m>trans m>-[M(H2O)4(O-gly)2]p>2+ p>, as well as [SO4]p>2鈭?/sup> tetrahedra, which were the main building units of the crystallizing Gly路MSO4路5H2O compounds (triclinic crystal system, space group m>P m> 鈭?#xA0;1), were predominating in these solutions. The vibrational spectra and the thermal behavior of the Gly路MSO4路5H2O compounds (M = Mgp>2+ p>, Cop>2+ p>, Znp>2+ p>) are in accord with the refined crystal structures. The cobalt compound displays antiferromagnetic behavior whereas the nickel and manganese compounds are ferromagnetic.<p>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 .<p>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, m>trans m>-[Co(H2O)4(O-gly)2]p>2+ p> and m>trans m>-[Co(H2O)2(SO4)2(O-gly)2]p>2鈭?/sup>, forming a chain structure (monoclinic crystal system, space group m>P m>21/m>c m>).