Syntheses,Characterizations and Properties of Two Unusual (3,4,6) and (3,6) -Connected Polynuclear 3D Metal-organic Frameworks

Abstract

Two novel polynuclcar metal-organic frameworks, namely, {[Cu 3 (BCPBA) 2 (bpmp)(H 2 O)]·2DMF} n (1) and {Zn 3 (BCPBA) 2 (bip)} n (2)[H 3 BCPBA=3,5-bi(4-carboxy-phenoxy)benzoic acid, bpmp=1,4-bis(pyridin-4-ylmethl)piperazine, bip=1,3-bis(imidazolyl)propane], were synthesized under solvothermal/hydrotherinal conditions. Their structures were determined by single-crystal X-ray diffraction(XRD) analysis and further characterized by infrared spectrosopy(IR), elemental analysis, and thermogravimetric analysis(TGA). Compound 1 is constructed by BCPBA 3- ligand linking three [Cu 2 (CO 2 ) 4 ] clusters to form a 3D framework with (4·8 2 )(8 6 )(4 2 ·6 8 ·8 3 ·9·10) topology. The 3D framework displays a self-penetra-ting phenomenon. Compound 2 exhibits a 3D framework with (4 2 ·6) 2 (4 4 ·6 2 ·8 8 ·10) topology constructed by trinuclear Zn(Ⅱ) SBUs.