Abstract
A series of Co(II), Ni(II) and Cu(II) coordination polymers and dinuclear metallocycles containing 4-aminopyridine (4-ampy) and benzenedicarboxylate ligands, {[M(4-ampy)2(1,4-BDC)]·H2O·CH3CH2OH}n (M = Ni, 1a; Co, 1b, 1,4-H2BDC = benzene-1,4-dicarboxylic acid), {[Ni2(4-ampy)4(1,3-BDC)2]·H2O·CH3CH2OH}n (1,3-H2BDC = benzene-1,3-dicarboxylic acid), 2, [M2(4-ampy)4(1,2-BDC)2] (M = Ni, 3a; Co, 3b, 1,2-H2BDC = benzene-1,2-dicarboxylic acid), [Co(4-ampy)2(1,3-BDC)]n, 4, {[Cu(4-ampy)2(1,4-BDC)] CH3CH2OH}n, 5a, and {[Cu(4-ampy)2(1,4-BDC)]·H2O}n, 5b·H2O, are reported, which were hydrothermally prepared and structurally characterized by using single crystal X-ray diffraction. Complexes 1a and 1b are isomorphous 1D zigzag chains, while 2 displays a concave–convex chain and 3a and 3b are dinuclear metallocycles that differ in the boding modes of the 1,2-BDC2− ligands, forming a 3D and a 2D supramolecular structures with the pcu and sql topologies, respectively. Complex 4 exhibit a 1D helical chain and complexes 5a and 5b·H2O are 1D linear and zigzag chains, in which the Cu2-1,4-BDC2− units adopt the cis and trans configurations, respectively. A novel irreversible structural transformation due to cis→trans isomerization of the Cu2-1,4-BDC2− units was observed in 5b⋅H2O and 5a upon water adsorption of the desolvated product of 5b·H2O.
Highlights
Coordination polymers (CPs) that exhibit diverse topologies [1,2,3,4] and potential applications in the fields such as sensing, catalysis, gas storage and separation are of great interest to research society during recent years
The self-assembly process of metal ions and organic ligands in suitable solvent systems may lead to the formation of one- (1D), two- (2D) or three-dimensional (3D) CPs and the structural types are governed by the identity of counterions [5,6], metal-to-ligand ratio [7]
Many CPs have been prepared and structurally characterized, the design and synthesis of CPs with predicted structural types and particular physical and chemical properties remain allusive in the crystal engineering of CPs
Summary
Coordination polymers (CPs) that exhibit diverse topologies [1,2,3,4] and potential applications in the fields such as sensing, catalysis, gas storage and separation are of great interest to research society during recent years. H2BDC) and benzene-1,4-dicarboxylic acid (1,4-H2BDC), Scheme 1, under hydrothermal conditions afforded a 1D loop-like chain, a self-catenated net with point symbol (65·8) and a 2D layer with the reported to react. 1,2-, 1,3- show and 1,4-phenylenediacetic acids under sql topology [19],with respectively It isthe interesting investigate the isomeric effect of the dicarboxylate ligands on net, the respectively [18]. N,N’-di(3-pyridyl)suberoamide with structural diversity of the CPs based on rigid neutral ligands, which, to the best of our knowledge, salt and acid Interesting to investigate the isomeric effect of the dicarboxylate ligands on the structural diversity of isomerization involving the 1,4-BDC ligands due to different coordination by the carboxylate the CPs based rigid neutral ligands, to theand bestlinear of ourCu(II).
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