Design,structure and properties of a novel 3D metal-organic framework constructed from N-donor ligand supporting Cd(II)-carboxylate layer

摘要

A novel three-dimensional microporous metal-organic framework (MOF),Cd_3(CTC)_2(TED)(H_2O)_2 centre dot (H_3O)_2Cl_2 (1) (H_3CTC=cis,cis-1,3,5-cyclohexanetricarboxylic acid and TED=triethylenediamine),has been synthesized under mild condition with mixed H_3CTC and TED ligands.It is of particular interest that twofold alternate (6,3) net subunits constructed from Cd centers and H_3CTC ligands are supported by linear TED ligands along the c axis to build a 3D architecture.This structure exhibits about 7.2 x 8.4 A~2 channels along the [100] direction.The water adsorption isotherm shows type I behavior with approximately 0.07 mL/g pore volume.The fluorescent emission spectrum of polymer 1 shows a sharp blue-shift peak at 522 nm (lambda_(ex)=235 nm).