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Abstract
Two heteropolyoxotungstates, K4Na4[Cu2(H2O)8Cu4(H2O)2(B-α-GeW9O34)2]14H2O (1) and K8[Cu2(H2O)8Cu4(H2O)2(B-α-SiW9O34)2]4H2O (2), have been obtained in aqueous solution and characterized by IR, TG, elemental analysis, magnetism, and single-crystal X-ray analysis. The two compounds are one-dimensional (1-D) inorganic polymers composed of Cu-containing sandwich polyoxoanions, linked by additional Cu2+ ions to construct 1-D ladder-like chain structures. To the best of our knowledge, it is the first example of a 1-D ladder-like chain based on sandwich-type anions and Cu2+ linkers. Furthermore, the chains in 1 are further connected by K+ into an extensive three-dimensional (3-D) framework. The magnetic studies of 1 indicate that antiferromagnetic interactions exist in the central tetra-metal set of the sandwich-type polyoxoanion.
Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 20701005); the Postdoctoral station Foundation of Ministry of Education (No. 20060200002); the Program for Changjiang Scholars and Innovative Research Team in University.