Co[HO₂C(CH₂)₃NH(CH₂PO₃H)₂]₂: A New Canted Antiferromagnet

A new cobalt(II) carboxylate−phosphonate, namely, Co[HO₂C(CH₂)₃NH(CH₂PO₃H)₂]₂, 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 CoO₆ 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[HO₂C(CH₂)₃NH(CH₂PO₃H)₂]₂ is a canted antiferromagnet with T_c = 8.75 K.