Two-dimensional octacyano-bridged Mn(II)–Nb(IV) bimetal assembly with four different configurations of 3-hydroxypyridines

We report the crystal structure and magnetic properties of a two-dimensional cyano-bridged MnII(S = 5/2)–NbIV(S = 1/2) bimetal assembly (1), and the magnetic properties of an isostructural cyano-bridged MnII–MoIV(S = 0) bimetal assembly (2). 1 contains 3-hydroxypyridine ligands with four types of coordination arrangements, includes μ-oxo-bridged Mn–Mn sites, and shows ferrimagnetism with a Curie temperature of 16 K due to the antiferromagnetic MnII–NbIV superexchange interaction through the cyano groups. 2 exhibits paramagnetism with the antiferromagnetic interaction between Mn and Mn through the μ-oxo-bridges.

2-D cyano-bridged MnII-NbIV bimetal assembly includes four different coordination arrangements of 3-hydroxypyridines and μ-oxo-bridged Mn-Mn sites, exhibiting ferrimagnetism with TC of 16 K due to the antiferromagnetic interaction of Nb―C≡N―Mn. The isostructural MnII-NoIV assembly shows paramagnetism.Figure optionsDownload as PowerPoint slideHighlights
► 2-D cyano-bridged MnII(S = 5/2) –NbIV(S = 1/2) bimetal assembly 1 and isostructural MnII–MoIV(S = 0) compound 2 are prepared.
► Compound 1 includes four different coordination arrangements of 3-hydroxypyridines.
► Compound 1 contains μ-oxo-bridged Mn–Mn sites in the cyano-bridged network.
► Compound 1 exhibits ferrimagnetism with TC of 16 K due to the antiferromagnetic superexchange interaction of Nb―C ≡ N―Mn.
► Compound 2 shows paramagnetism due to the antiferromagnetic superexchange interaction of Mn–Mn through μ-oxo-bridges.