A novel 3D cyano-bridged mixed-valence Co~(II)/CO(III)canted antiferromagnet constructed from defective cubanes.Synthesis,X-ray structure and magnetic properties

摘要

The hydrothermal reaction of 2-pyrimidine-carboxamide,CoCl2-6H2O and K3[Co(CN)6] affords a novel mixed-valence Co~(II)/Co~(III)3D complex K[Co3(CN)6(ox)(H2O)2]H2O,which contains cyano-bridged Co7 defective cubanes connected by oxalate and cyanide bridging groups and behaves as a canted antiferromagnet with T_c =17.5 K.