pH-dependent two novel 3D polynuclear cobalt(ii) cluster-based metal–organic frameworks constructed from a tri-pyridyl-bis-amide and a polycarboxylate: assembly, structures and properties

• DOI: 10.1039/c3ra41552j
• Publication Date: 2013-05-24T08:32:00Z
• Authors: Xiuli Wang; Jingjing Huang; Lianli Liu; Guocheng Liu; Hongyan Lin; Juwen Zhang; Naili Chen; Yun Qu
• Keywords: Amide; Bridging ligand

The hydrothermal reaction of CoCl2 with N,N′-bis(pyridine-3-yl)pyridine-3,5-dicarboxamide (L) and 1,3,5-benzenetricarboxylic acid (H3BTC) mixed ligands affords two novel polynuclear cobalt cluster-based metal–organic frameworks (MOFs), [Co3(L)2(BTC)2(H2O)2]·6H2O (1) {[Co2(L)(BTC)(OH)]·2.5H2O}2 (2). Single crystal X-ray diffraction analysis reveals that the CoII ions in complex 1 are connected by BTC anions a four-coordinated mode to form dimensional (2D) undulating layer based on dinuclear [Co2(COO)4] units, which is extended into 3D (3, 4, 5)-connected MOF L ligand μ3-bridging coordination mode. In 2, displays six-coordinated connect 2D corrugated derived from tetranuclear [Co4(μ3-OH)2(COO)6] motifs, layers further 8)-connected tfz-d via μ2-bridging ligands. title complexes exhibit (42·63·85)2(42·63·8)2(6·82)2(62·84) topology for (43)2(46·618·84) 2. pH value, as well various modes tri-pyridyl-bis-amide ligands, play crucial role construction diverse topological structures Complex exhibits excellent photocatalytic activity dye degradation under UV light. addition, electrochemical behaviour magnetic fluorescent properties have also been investigated.