Price, D., Powell, A., and Wood, P. (2000) Hydrothermal synthesis, structure, stability and magnetism of Na2Co2(C2O4)3(H2O)2 : a new metal oxalate ladder. Journal of the Chemical Society: Dalton Transactions, 20 . pp. 3566-3569. (doi:10.1039/B005494L)
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Purple crystals of the compound Na2Co2(C2O4)3(H2O)21 were synthesized in high yielding hydrothermal reactions. The room temperature crystal structure reveals an anionic cobalt oxalate network with a 2-leg ladder topology. The ladder frameworks run parallel to the a axis and are held together by both hydrogen bonding and electrostatic interactions. The magnetism of 1 was studied as a function of temperature and field. The susceptibility shows a broad maximum at about 21 K which is associated with short-range correlations, and a phase transition to a long range ordered Néel state at about 9 K. Above TN the data are fitted by a range of models which suggests the intra-ladder couplings are of the order −4 to −5 cm−1 and the inter-ladder coupling is approximately 0.2 cm−1. Themogravimetric analysis shows 1 to be stable up to 350 °C, where water of crystallisation is lost. A second decomposition episode is seen at 400 °C.
|Glasgow Author(s) Enlighten ID:||Price, Dr Daniel|
|Authors:||Price, D., Powell, A., and Wood, P.|
|Subjects:||Q Science > QD Chemistry|
|College/School:||College of Science and Engineering > School of Chemistry|
|Journal Name:||Journal of the Chemical Society: Dalton Transactions|
|Journal Abbr.:||J. Chem. Soc., Dalton Trans.|
|Published Online:||19 September 2000|