Y[Fe1-xCox(CN)6]?4H2O (0 ≤ x ≤ 1) SOLID SOLUTIONS : SYNTHESIS, CRYSTAL STRUCTURE, THERMAL DECOMPOSITION AND SPECTROSCOPIC AND MAGNETIC PROPERTIES

DIEGO MAURICIO GIL; JULIO GUIMPEL; ANDREA PAESANO JR.; RAÚL ERNESTO CARBONIO; MARÍA INÉS GÓMEZ

JOURNAL OF MOLECULAR STRUCTURE

ELSEVIER SCIENCE BV

Año: 2012 vol. 1015 p. 112 - 117

0022-2860

The series of solid solutions Y[Fe1-xCox(CN)6].4H2O were prepared and characterized by means of powder X-ray diffraction (PXRD), Infrared and Mössbauer spectroscopy and magnetic measurements. The thermal decomposition process has been followed by termogravimetric and differential thermal analysis (TGA-DTA). The crystal structure of the complexes was refined by means of Rietveld analysis. The Y[Fe1-xCox(CN)6].4H2O complexes crystallize in the orthorhombic crystal system, space group Cmcm. The Y3+ ion is eight-coordinated forming a bicapped distorted trigonal prism YN6O2. The Fe3+ and Co3+ ions are six-coordinated in the form of an irregular octahedra (Fe,Co)C6 group and cyanide linkages between YN6O2 and (Fe,Co)C6 groups build an infinite polymeric array. The Mössbauer spectra of all solid solutions Y[Fe1-xCox(CN)6]?4H2O present quadrupolar splittings with negative isomer shifts values due to the existence of a strong π back-bonding effect from the Fe3+ ion towards the CN ligands. All compounds follow the Curie-Weiss law showing anti-ferromagnetic interactions at very low temperatures.