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A metal–organic framework gel with Cd2+ derived from only coordination bonds without intermolecular interactions and its catalytic ability†
Hyo Hee Lee,Sung Ho Jung,Sunhong Park,Ki-Min Park,Jong Hwa Jung
New Journal of Chemistry Pub Date : 05/02/2013 00:00:00 , DOI:10.1039/C3NJ00164D
Abstract

A cyclohexane-based ligand (1) as a triconnected linker forms a supramolecular gel in the presence of transition metal ions, particularly Cd2+ and Zn2+. 1 can also be gelated with cadmium counter ions such as NO3, ClO4 and SO42−. The gels have been characterized by SEM, TEM, rheometry and single crystal X-ray crystallography. The Cd2+–cyclohexane-based ligand gel shows a fibrillar structure with diameters ranging from 20–50 nm. X-ray analysis revealed that 1 forms a 1D coordination polymer structure with the Cd2+ ion, with an octahedral structure. The rheological properties of the Cd2+–cyclohexane-based ligand gel were strongly dependent on the concentration of Cd2+. Furthermore, the xerogel 1 with Cd2+ acted as a base catalyst in the Knoevenagel condensation reaction.

Graphical abstract: A metal–organic framework gel with Cd2+ derived from only coordination bonds without intermolecular interactions and its catalytic ability
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