Y[Fe<sub>1鈭?/sub><sub>xsub>Co<sub>xsub>(CN)<sub>6sub>]路4H<sub>2sub>O (0 猢?#xa0;x 猢?#xa0;1) solid solutions: Synthesis, crystal structure, thermal decomposition and spectroscopic and magnetic properties
- 作者：Diego M. Gil<sup>asup> ; J. Guimpel<sup>bsup><sup> ; sup><sup>1sup> ; Andrea Paesano Jr.<sup>csup> ; Raú ; l E. Carbonio<sup>dsup><sup> ; sup><sup>1sup> ; Marí ; a Iné ; s Gó ; mez<sup>asup><sup> ; sup><sup>mgomez@fbqf.unt.edu.arsup>
- 关键词：Y[Fe1&minus ; xCox(CN)6]· ; 4H2O ; Crystal structure refinement ; Rietveld analysis ; Infrared spectroscopy ; Thermal decomposition
- 刊名：Journal of Molecular Structure
- 出版年：2012
- 期刊代码：62_00222860
- 类别：ch
- 出版时间：16 May, 2012
- 卷：1015
- 期：Complete
- 页码：112-117
- 文件大小：1026 K
摘要
The series of solid solutions Y[Fe<sub>1鈭?/sub><sub>xsub>Co<sub>xsub>(CN)<sub>6sub>]路4H<sub>2sub>O (0 猢?#xA0;x 猢?#xA0;1) were prepared and characterized by means of powder X-ray diffraction (PXRD), Infrared and M枚ssbauer spectroscopy and magnetic measurements. The thermal decomposition process has been followed by thermogravimetric and differential thermal analysis (TGA-DTA). The crystal structure of the complexes was refined by means of Rietveld analysis. The Y[Fe<sub>1鈭?/sub><sub>xsub>Co<sub>xsub>(CN)<sub>6sub>]路4H<sub>2sub>O complexes crystallize in the orthorhombic crystal system, space group Cmcm. The Y<sup>3+sup> ion is eight-coordinated forming a bicapped distorted trigonal prism YN<sub>6sub>O<sub>2sub>. The Fe<sup>3+sup> and Co<sup>3+sup> ions are six-coordinated in the form of an irregular octahedra (Fe,Co)C<sub>6sub> group and cyanide linkages between YN<sub>6sub>O<sub>2sub> and (Fe,Co)C<sub>6sub> groups build an infinite polymeric array.
The M枚ssbauer spectra of all solid solutions Y[Fe<sub>1鈭?/sub><sub>xsub>Co<sub>xsub>(CN)<sub>6sub>]路4H<sub>2sub>O present quadrupolar splittings with negative isomer shifts values due to the existence of a strong 蟺 back-bonding effect from the Fe<sup>3+sup> ion towards the CN ligands.
All compounds follow the Curie-Weiss law showing anti-ferromagnetic interactions at very low temperatures.