Two novel metal-organic complexes{[Co(Hbmp)2(H2O)]·TFBDC}(1),{[Co(Hbmp)(TDC)(H2O)]}n(2)[Hbmp=2-(2-benzimidazolyl)-6-methylpyridine,H2TFBDC=tetrafluoroterephthalic acid,H2TDC=2,5-thiophene dicarboxylic acid]have been hydrothermally synthesized.Their structures were characterized by X-ray single crystal diffraction,X-ray powder diffraction,elemental analysis and infrared spectroscopy.The results showed that the crystal system of complex 1 is rhombohedral,Fddd space group,with the central ion Co(Ⅱ)in a triangular bipyramidal configuration and cell parameters of a=1.47278(11)nm,b=2.9178(3)nm and c=3.0274(2)nm.The crystal system of complex 2 is monoclinic,C2/c space group,with the central ion Co(Ⅱ)in an octahedral configuration and cellparameters of a=1.77753(17)nm,b=1.84660(17)nm,c=1.33365(12)nm.The zero-dimensional structure of complex 1 forms a three-dimensional supramolecular network through the rich hydrogen bonding forces of C—H…O,C—H…F,N—H…O,O—H…O.Complex 2 is a one-dimensional chain structure of the neighbouring metal Co(Ⅱ)using the two coordination modes of carboxylic acids,which is also expanded into a three-dimensional supramolecular mesh structure with the help of abundant hydrogen bonding forces.Using UV diffuse reflectance spectroscopy,an Eg value of 2.65 eV for 1 and 2.85 eV for 2 were obtained,demonstrating that both complexes are potential semiconductor materials.The magnetic property of the two complexes was also investigated at 2-300 K with an external magnetic field of 1000 Oe and magnetic susceptibility data were rationallyfitted with the Curie-Weiss Law at 2-300 K with θ=-5.13 K and-5.84 K,respectively,demonstrating the existence of antiferromagnetic interactions between the two complexes.
MOFshydrothhermal synthesiscrystal structureoptical band gapantiferromagnetism
NETL
NSTL
万方数据
