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Synthesis, crystal structure, spectroscopy and magnetic properties of a dinuclear Cu complex with 3,5-bis(2-pyridyl)pyrazole bridging ligand |
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| Authors: | Miao Du Shen-Tan Chen Xian-He Bu Joan Ribas |
| Institution: | a Department of Chemistry, Nankai University, Tianjin 300071, People's Republic of China b College of Chemistry and Life Science, Tianjin Normal University, Tianjin 300074, People's Republic of China c Departament de Química Inorgànica, Universitat de Barcelona, Diagonal, 647, Barcelona 08028, Spain |
| Abstract: | A dinuclear CuII complex Cu2(bpp)2(H2O)2](ClO4)2 (1) with 3,5-bis(2-pyridyl)pyrazole (Hbpp), has been synthesized and characterized by elemental analyses, thermal analysis, conductance, UV-vis and IR spectra. The crystal structure of 1, determined by X-ray diffraction technique, reveals that two centrosymmetric CuII centers are bridged by a pair of tetradentate anionic bpp ligands, adopting a square-pyramidal environment with the water ligand occupying the axial site. An interesting feature of this structure is the formation of a two-dimensional supramolecular network through O-H?O hydrogen bonds between the water moieties of the cationic Cu2(bpp)2(H2O)2]2+ subunits and perchlorate anions. The magnetic properties of 1 have been investigated by variable-temperature magnetic susceptibility and EPR measurements. Very strong antiferromagnetic interaction between the CuII centers (with H=−JS1S2, J=−368.3 cm−1) has been observed, and the magneto-structural correlations was analyzed. |
| Keywords: | 3 5-Bis(2-pyridyl)pyrazole (Hbpp) Crystal structure Dinuclear CuII complex Hydrogen bonds Magnetism |
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