Abstract
Two new supramolecular architectures, namely, [Cd(L1)2(H2O)]n (1) and [Ni(L2)2(H2O)]n (2), were synthesized by the reaction of corresponding metal salts of CdCl2·2.5H2O and NiCl2·6H2O with 2-(1H-imidazol-4-yl)benzoic acid (HL1) and 3-(1H-imidazol-4-yl)benzoic acid (HL2) respectively, and characterized by single-crystal X-ray diffraction, IR spectroscopy, elemental analysis and powder X-ray diffraction (PXRD). Both HL1 and HL2 ligands are deprotonated to be L1- and L2- anions that coordinate with Cd(II) and Ni(II) atoms to form two-dimensional (2D) layer structure. Topologically, complex 1 is a 2D network with (4, 4) sql topology, while 2 is a typical 63-hcb topology net. Complex 1 exhibits intense light blue emission in the solid state at room temperature.
Highlights
The rational design and construction of metal-organic frameworks (MOFs) has become an expanding research topic in the fields of supramolecular chemistry and crystal engineering because of their intriguing molecular architectures and intricate topologies and their promising applications in various areas in fluorescence, gas adsorption, separation, ion exchange, magnetic properties, catalysis, and so on [1,2,3,4,5,6]
Taking the various coordination modes of carboxyl group into consideration, we have further carried out studies to design another type of novel difunctional ligand containing
The HL1 ligand is quite different from the ligand of 4-(1H-imidazol-4-yl)benzoic acid reported in our previous study, that the aromatic groups often are coplanar due to lack of steric hindrance
Summary
The rational design and construction of metal-organic frameworks (MOFs) has become an expanding research topic in the fields of supramolecular chemistry and crystal engineering because of their intriguing molecular architectures and intricate topologies and their promising applications in various areas in fluorescence, gas adsorption, separation, ion exchange, magnetic properties, catalysis, and so on [1,2,3,4,5,6]. Because the complexes incorporate metallic centers and bridging organic linkers, it is important to design suitable organic ligands and choose metallic centers to assemble desirable frameworks with specific structures and functions. Due to their favorable coordination abilities for the N or O donor atoms, the organic linkers incorporating N-heterocyclic bridging or carboxyl groups ligands are extensively applied to construct coordination polymers and have made great progress in the field of crystal engineering [7,8]. We have elaborately designed the series of novel 4-imidazole ligands with flexible coordination modes, and successfully employed the ligands to construct porous frameworks based on the. We report the synthesis and crystal structures of two new coordination polymers of [Cd(L1 ) (H2 O)2 ]n (1) and [Ni(L2 ) (H2 O)]n (2) obtained by the reaction of HL1 and HL2 with corresponding metal salts under hydrothermal condition
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