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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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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.
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