A novel 3-D metal–organic framework constructed from a negative 2-D layer [Cu2(BTB)2]2− and long linkers [Cu(4,4′-bipy)2]2+: Synthesis, crystal structure and blue fluorescence

A 3-D novel coordination polymer {[Cu5(BTB)4(4,4′-bipy)2(H2O)6][Cu(4,4′-bipy)(H2O)4]}n · 8nH2O (H3BTB = 1,2,3-benzene-tricarboxylic acid), containing 1-D chains [Cu(4,4′-bipy)(H2O)4]n, is obtained from the diffusion method. A negative 2-D layered structure [Cu2(BTB)2]2− along the bc-plane based on tetranuclear paddle-wheel clusters has been generated from 1-D chains along the b − c vector linked by BTB3−. A 3-D metal–organic framework is further constructed from the negative 2-D layer [Cu2(BTB)2]2− and long linker [Cu(4,4′-bipy)2]2+. The compound produces blue fluorescence with emission at 417 nm possibly assigned to LMCT.