Structure and Properties of a Cd(II) Metal-organic Framework Based on a Newly Designed Heterotopic Tripodal N-Donor Ligand

In this paper, a Cd(II) metal-organic framework (MOF), Cd-DIBT (HDIBT = 5-(3',5'-di(1H-imidazol-1-yl)-[1,1'-biphenyl]-4-yl)-1H-tetrazole), has been constructed based on a newly designed heterotopic tripodal ligand containing both imidazolyl and pyrazolyl groups. The Cd-DIBT exhibits a new three-dimensional (3,3,9)-connected trinodal network topology with point symbol of (4(2) .6)(4(3))(2)(4(8).6(15).8(12).10) (namely scnu) based on binuclear secondary building blocks (SBUs). Staggered 1D channels were observed in such framework and was estimated to have 5487 angstrom(3) potential solvent area (56%). The stability study reveals that the framework is unstable and easily transforms into amorphous MOF after the removal of guest molecules. In addition, the Cd-DIBT shows a ligand-centered luminescence.