Microporous rare-earth coordination polymers constructed by 1,4-cyclohexanedicarboxylate

In this paper, three novel microporous materials of 1, 4-cyclohexanedicarboxylate Ln[(C8H10O4)1.5(H2O)] · 0.5(H2O) (Ln = Eu for 1, Nd for 2, Sm for 3) are synthesized by the hydrothermal method. The powder X-ray diffraction patterns demonstrate three complexes are isomorphism. The crystal structure of the coordination polymer 1 reveals that the Eu3+ ion center is located in the nine-coordinated environment and the carboxyl groups chelate Eu3+ ions to form 1-D channels through c-axis in μ1,μ2 and μ3 fashion. The properties of the microporous materials are all characterized by the adsorption and desorption of the nitrogen gas and show tremendous difference. TGA illustrate the open frameworks are stable to about 450 °C and they are retained upon removal of water molecules in channels.