Solvent-Induced Syntheses, Crystal Structures and Magnetic Properties of Two Mononuclear Er(III) Complexes

By adjusting the ratio of the solvent components, two mononuclear erbium complexes, [Er(bpad)(3)]center dot CH3OH center dot H2O (1) and [Er(bpad)(2)(H2O)]NO(3 center dot)3H(2)O (2) (Hbpad=N-3-benzoylpyridine-2-carboxamidrazone), have been successfully synthesized. In the mixure of methanol and water solvent (2:1, V/V), yellow crystals of 1 were prepared by solution reaction of Er(NO3)(3)center dot 6H(2)O, Hbpad and triethylamine. Interestingly, complex 2 was obtained by the similar way of 1, while the volume ratio of CH3OH to H2O is altered to be 1:2. The resulting complexes were characterized by IR spectrum, elemental analysis. Two complexes are air stable, and can maintain the crystalline integrities at ambient conditions. Crystal structure analysis indicates that the Er(III) ions in 1 and 2 present nona-coordinated and octa-coordinated environments in different coordination geometries, respectively. Monocapped square antiprism (C-4u) is formed in 1, while biaugmented trigonal prism (C-2v) is observed in 2. The direct-current (dc) and alternating-current (ac) magnetic susceptibilities of 1 and 2 have been analyzed as well. CCDC: 1478582, 1; 1478579, 2.