Two Zn(II)/Cd(II) Metal-organic Frameworks Constructed from 1,3,5-Benzenetricarboxylic Acid and 1,4-Bis(1-imidazolyl)benzene: Syntheses, Structures and Photoluminescent Properties

Two new d(10) metal-based metal-organic frameworks, {[Zn-3(btc)(2)(bib)(2)(H2O)(2)]center dot 2H(2)O}(n)(1) and {[Cd-3(btc)(2)(bib)(1.)(5)(H2O)(6)]center dot 6H(2)O](n) (2) (btc = 1,3,5-benzenetricarboxylate anion, bib = 1,4-bis(1-imidazolyl)benzene) have been prepared under hydrothermal conditions by the reactions of d(1)(0) metal oxides of ZnO and CdO with the aromatic polycarboxylic H(3)btc and the N-heterocyclic bib. The two products were characterized by single-crystal X-ray diffraction analysis, elemental analysis, thermogravimetric analysis (TGA), and IR spectroscopy. Complexes 1 and 2 crystallize in monoclinic C2/c and triclinic P (1) over bar space groups, respectively. 1 shows a 3D framework, and the potential large voids of the 3D network lead to a 3-fold interpenetrating architecture. 2 displays a 2D framework, and the adjacent 2D layers expand into a 3D supramulecular network via rich hydrogen bonds. Moreover, the luminescent properties of the two complexes are investigated in solid state.