Open AccessThermal analysis and structure transformation of Mn12-Ac magnetic molecular crystals
Author(s) -
Ying Liu,
Peiwen Ge,
S. K. Su,
Lijuan Zhang,
Yunping Wang
Publication year - 2004
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.53.4015
Subject(s) - materials science , molecule , ion , atmospheric temperature range , crystal structure , thermal stability , crystal (programming language) , thermal , crystallography , magnetic susceptibility , thermodynamics , chemistry , physics , organic chemistry , computer science , programming language
The thermal stability of Mn12-Ac[Mn12(CH3COO)16(H2O)4O12]52CH3COOH54H2O magnetic molecular crystals was investigated by TG-DTA from room temperature to 270℃. According to the results of XRD and TG,we found that Mn12-Ac lost the crystal water and the acetic acid molecules of solvation which were located between the adjacent molecules in the temperature range from 25℃ to 1 10℃. At the same time, 4H2O which were linked with 4 Mn3+ were lost. The crystalline structure of Mn12-Ac single crystal was destroyed during this course. However, the core structure in the molecule was well preserved. From 180℃ to 230℃, a further transformatio n took place, Mn12-Ac lost all the CH3COO- ions and turned intoγ-Mn2O3, with a little amount of Mn3O4.