Huan-Huan Li, Zheng Niu, Long Chen, Hao-Bin Jiang, Ya-Ping Wang and Peng Cheng
CrystEngComm, 2015,17, 5101-5109
DOI:
10.1039/C5CE00931F,
Paper
Three metal–organic frameworks based on trinuclear building blocks, isomeric α-{[NH2(CH3)2]2[Zn3(FDA)4]·2DMF}n (1) and β-{[NH2(CH3)2]2[Zn3(FDA)4]·2DMF}n (2), as well as {[NH2(CH3)2][Zn3(FDA)2(μ2-OH)2(μ3-OH)]·1.03H2O}n (3) (H2FDA = furan-2,5-dicarboxylic acid), have been obtained under solvothermal conditions by adjusting the anions of zinc salts and solvents. These compounds are characterized by single-crystal X-ray diffraction, thermogravimetric analysis and luminescence measurements. The building blocks of the three MOFs are trinuclear clusters stabilized by carboxylic groups, and the resulting three-dimensional frameworks are differentiated by the structural nature of the secondary building units (SBU). MOFs 1 and 2 display pcu and bcu nets, respectively. MOF 3 exhibits a new topology, which is a 3,8-connected net with the point symbol of (3·4·5)2(34·44·52·66·710·82). The photoluminescence spectra of 1–3 are reported for the first time, and all the Zn(II) complexes emit blue luminescence.
