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¸÷λ¸ßÊÖ£¬ËÄܰïÎÒ·ÒëÏÂÕâ¶ÎÎÄ×Ö°¡£¬¿´µÃÌ«ÀÛÁË£¬Ð»Ð»ÁË Therefore, 1H-benz- imidazole-5,6-dicarboxylic acid (H3bidc) is an outstanding candidate ligand to construct d¨Cf HMCPs as it is a multidentate rigid ligand with O-donors and N-donors and possesses diverse coordination modes with different metal ions. Moreover, the distance between the N-donors and O-donors in H3bidc is large enough to overcome steric hindrance. In addition H3bidc can be used to assemble HMCPs with interpene- trated frameworks. Our group reported Ln¨CAg HMCPs with doubly interpenetrated frameworks constructed from the H3bidc ligand¡£ To the best of our knowledge, 3d¨C4f HMCPs constructed by H3bidc ligands have not yet been reported, although 3d¨C4f HMCPs have been widely investigated, of which most are Cu¨CLn systems.11 However, the number of reported Ni¨CLn HMCPs is relatively limited and they are mainly cluster com- plexes or low-dimensional complexes.12 Therefore, the synthesis of higher dimensional Ni¨CLn HMCPs complexes is of great importance. Based on the above-mentioned points, our aim is to synthesize 3d¨C4f HMCPs with novel frameworks bearing noteworthy prop- erties by using NiSO •7H O, rare earth oxides and H bidc ligands. Herein, we report the synthesis, structural characteriz- ation and properties of a family of [Ln2Ni(Hbidc)2(SO4)2- (H2O)8]n HMCPs [Ln = Pr (1), Sm (2), Eu (3), Gd (4), Tb (5), Dy (6), Ho (7), Er (8), Yb (9)]. Structure determination revealed that all compounds have a three-dimensional network and the lanthanide contraction has a significant influence on the structure transformation. The luminescence properties of HMCPs 1¨C9 were studied, and several of the HMCPs exhibit the characteristic transitions of the corresponding lanthanide ions. The magnetic properties of HMCPs 4 and 6¨C8 were measured, revealing that ferromagnetic coupling is present in 4. [ Last edited by winter_north on 2013-2-20 at 00:06 ] |
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