Abstract
Four new metal-organic frameworks (MOFs) [Zn(L)(bpdc)]center dot 1.6H(2)O (1), [Co(L)(bpdc)]center dot H2O (2), [Ni-3(L)(2)(bptc)(2)(H2O)(10)]center dot 2H(2)O (3) and [Cd-2(L)(Hbptc)(2)] (4) were achieved by reactions of the corresponding metal salt with mixed organic ligands of 1,4-di(1H-imidazol-4-yl) benzene (L) and 4,4'-benzophenonedicarboxylic acid (H2bpdc) or biphenyl-2,4', 5-tricarboxylic acid (H(3)bptc). They exhibit varied structures: MOFs 1 and 4 are porous three-dimensional (3D) frameworks, while 2 is an infinite one-dimensional (1D) chain and 3 is a two-dimensional (2D) network. Remarkably, 1 and 4 can act as potential fluorescent materials for sensing Fe(III) ions and different ketone molecules with high selectivity and sensitivity. In addition, MOF 1 shows selective adsorption of CO2 over N-2.