文摘
Three copper coordination polymers [Cu2(bbtc)(bbi)2]¡¤3H2O (1) [bbi?=?1,1-(1,4-butanediyl)bis(imidazole), bbtc?=?3,3?4,4?benzophenonetetracarboxylate], [Cu3(Hbbtc)2(3-bpfp)3(H2O)2]¡¤10H2O (2) [3-bpfp?=?bis(3-pyridylformyl)piperazine], and [Cu(H2bbtc)(4-bpfp)(H2O)]¡¤H2O (3) [4-bpfp?=?bis(4-pyridylformyl)piperazine] have been hydrothermally synthesized by self-assembly of aromatic tetracarboxylate ligand bbtcd [bbtcd?=?3,3?4,4?benzophenonetetracarboxylic acid dianhydride], and bidentate N-heterocyclic ligands bbi, 3-bpfp or 4-bpfp. X-ray diffraction analysis reveals that compound 1 is a novel three-dimensional (3-D) metal-organic framework with a binodal (4,4)-connected {62.84}{64.82}2 topology. Compound 2 possesses a two-dimensional (2-D) layered structure, in which a trinodal (3,4,4)-connected network with novel {3.62}2{3.63.72}2{32.62.72} topology can be found. Compound 3 displays a one-dimensional (1-D) ribbon polymer chain based on 4-bpfp ligands and H2bbtc2- anions. The adjacent layers for 2 and the adjacent chains for 3 are further linked by hydrogen bonding and ¦Ð-¦Ð stacking interactions to form 3-D supramolecular networks. Importantly, bbtcd with different protonation extent displays three different coordination modes in compounds 1-3: the four carboxyl groups of bbtc4- anions combine with CuII ions by tetra(monodentate) mode in 1, three carboxyl groups of Hbbtc3?/sup> anions show tri(monodentate) coordination mode and the fourth carboxyl group is protonated in 2, whereas for 3 only two carboxyl groups H2bbtc2?/sup> anions adopt bis(monodentate) coordination mode and the other two are protonated. N-heterocyclic ligands play important roles in the construction of title complexes with different dimensionality. In addition, the electrochemical properties of the three copper compounds bulk-modified carbon paste electrodes have been reported.