Co[HO<sub>2</sub>C(CH<sub>2</sub>)<sub>3</sub>NH(CH<sub>2</sub>PO<sub>3</sub>H)<sub>2</sub>]<sub>2</sub>: A New Canted Antiferromagnet
Bing-Ping Yang (1397941)Andrey V. Prosvirin (1982629)Ya-Qin Guo (2451700)Jiang-Gao Mao (1397944)
Abstract
A new cobalt(II) carboxylate−phosphonate, namely, Co[HO<sub>2</sub>C(CH<sub>2</sub>)<sub>3</sub>NH(CH<sub>2</sub>PO<sub>3</sub>H)<sub>2</sub>]<sub>2</sub>, with a layered architecture has been synthesized by hydrothermal reactions. The Co(II) ion in the title compound is octahedrally coordinated by six phosphonate oxygen atoms from four carboxylate phosphonate ligands. Neighboring CoO<sub>6</sub> octahedra are interconnected by phosphonate groups into a 2D layer with a 4,4-net topology. Adjacent layers are further cross-linked via hydrogen bonds between the noncoordinate carboxylate groups and noncoordinate phosphonate oxygens. The ac and dc magnetic susceptibility and magnetization measurements indicate that Co[HO<sub>2</sub>C(CH<sub>2</sub>)<sub>3</sub>NH(CH<sub>2</sub>PO<sub>3</sub>H)<sub>2</sub>]<sub>2</sub> is a canted antiferromagnet with <i>T</i><sub>c</sub> = 8.75 K.
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