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http://dx.doi.org/10.5012/bkcs.2008.29.1.122

Determination of Strongly Interacting Spin Exchange Paths in Cu2(O3PCH2PO3) on the Basis of Spin Dimer Analysis  

Bae, Hyun-Woo (Department of Chemistry and Research Institute of Basic Science of Kyung Hee University)
Koo, Hyun-Joo (Department of Chemistry and Research Institute of Basic Science of Kyung Hee University)
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Abstract
The magnetic properties of the organic/inorganic hybrid copper-methylenediphosphonate, Cu2(O3PCH2PO3) were examined by performing the spin dimer analysis based on the extended Hckel tight binding method. In Cu2(O3PCH2PO3) the CuO3 chains made up of edge-sharing CuO5 square pyramidal units are inter-linked by O-P-O bridges. The Cu-O-Cu superexchange interactions of the CuO3 chains are negligibly weak compared with the Cu-O…O-Cu super-superexchange interactions that occur between the CuO3 chains. The spin exchange interactions of Cu2(O3PCH2PO3) are dominated by three super-superexchange interactions, which leads to a three-dimensional antiferromagnetic spin lattice. The strongest spin exchange interactions form isolated spin dimers, which suggests that, to a first approximation, the magnetic properties can be described in terms of an isolated spin dimer model.
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