Abstract
Thermal and structural changes of lanthanum hexacyanocobaltate(III) pentahydrate, La[Co(CN)6]⋅5H2O were investigated by means of thermal analysis, visible electronic spectra, IR, powder X-ray diffraction, EXAFS and TG-MS. The dehydration of La[Co(CN)6]⋅5H2O proceeded reversibly through three steps and steps corresponded to the losses of H2O, 3H2O and H2O, and the enthalpy changes for these steps were 51.3, 211.0 and 38.7 kJ mol−1, respectively.
After the dehydration, the colour of the anhydride changed from white to blue around 290°C and an abrupt mass loss occurred at 350°C. The colour change seems to be attributable to the change of coordination geometry around the Co ions from an octahedral structure to a tetrahedral one. LnCoO3 was obtained as a final product by heating the sample to 1000°C.
Similar content being viewed by others
References
D. H. Templeton and C. H. Dauben, J. Am. Chem. Soc. 76 (1954) 5237.
C. James and P. S. Willard, J. Am. Chem. Soc., 38 (1916) 1497.
W. Prandtl and S. Z. Mohr, Z. Anorg. Allg. Chem., 236 (1938) 243.
F. Hulliger, M. Landolt and H. Vestch, J. Solid State Chem., 18 (1976) 307.
D. F. Mullica, W. O. Milligan and W. T. Kouba, J. Inorg. Nucl. Chem., 41 (1979) 967.
D. F. Mullica, H. O. Perkins and E. L. Sappenfield, J. Solid State Chem., 74 (1988) 41.
W. Petter, V. Gramlich and F. Hulliger, J. Solid State Chem., 82 (1989) 161.
D. F. Mullica and E. L. Sappenfield, J. Solid State Chem., 82 (1989) 168.
V. Gramlich, W. Petter and F. Hulliger, Acta Crystallogr., Sect. C46 (1990) 724.
H. Yokobayashi, Netusokutei 18 (1991) 157.
Y. Yukawa, S. Igarashi, T. Kawaura and H. Miyamoto, Inorg. Chem., 35 (1996) 7399.
Y. Masuda, K. Nagaoka, H. Ogawa, O. Nakazato, Y. Yukawa and H. Miyamoto, J. Alloys Compds., 235 (1996)
Y. Masuda, K. Kikuchi, Y. Yukawa and H. Miyamoto, J. Alloys Compds., 260 (1997) 70.
P. K. Gallagher, Mat. Res. Bull., 3 (1968) 225.
Y. Sadaoka, New Development of Studies on Rare Earth Complexes (Report of a priority Area Program supported by The Ministry of Education, Science Sports and Culture, Japan), 1997, p. 785.
Kagaku Binran Kisohen (Handbook of Chemistry), Vol. II, The Chemical Society of Japan Maruzen, Tokyo 3rd Ed., 1984, p. 267.
Y. Yukawa, S. Shirotiri, K. Minagawa and Y. Masuda, J. Alloys Compds., 266 (1997) 123.
J. Fujita and Y. Shimura, Bull. Chem. Soc. Jpn., 36 (1963) 1281.
P. K. Gallagher and B. Prescott, Inorg. Chem., 9 (1970) 2510.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Masuda, Y., Seto, Y., Wang, X. et al. A Thermal and Structural Study On Lanthanum Hexacyanocobaltate(III) Pentahydrate, La[Co(CN)6]⋅5H2O. Journal of Thermal Analysis and Calorimetry 60, 1033–1041 (2000). https://doi.org/10.1023/A:1010136514953
Issue Date:
DOI: https://doi.org/10.1023/A:1010136514953