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 {[Cu-5(BTB)(4)(4,4'-bipy)(2)(H2O)(6)][Cu(4,4'-bipy)(H2O)(4)]}(n) . 8nH(2)O (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 [Cu-2(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 [Cu-2(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. (c) 2006 Elsevier B.V. All rights reserved.