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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)]·H 2 O·CH 3 CH 2 OH} n (M = Ni, 1a ; Co, 1b , 1,4-H 2 BDC = benzene-1,4-dicarboxylic acid), {[Ni 2 (4-ampy) 4 (1,3-BDC) 2 ]·H 2 O·CH 3 CH 2 OH} n (1,3-H 2 BDC = benzene-1,3-dicarboxylic acid), 2 , [M 2 (4-ampy) 4 (1,2-BDC) 2 ] (M = Ni, 3a ; Co, 3b , 1,2-H 2 BDC = benzene-1,2-dicarboxylic acid), [Co(4-ampy) 2 (1,3-BDC)] n,  4 , {[Cu(4-ampy) 2 (1,4-BDC)] CH 3 CH 2 OH} n , 5a , and {[Cu(4-ampy) 2 (1,4-BDC)]·H 2 O} n , 5b ·H 2 O, 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-BDC 2- 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 ·H 2 O are 1D linear and zigzag chains, in which the Cu 2 -1,4-BDC 2- units adopt the cis and trans configurations, respectively. A novel irreversible structural transformation due to cis → trans isomerization of the Cu 2 -1,4-BDC 2- units was observed in 5b ⋅H 2 O and 5a upon water adsorption of the desolvated product of 5b ·H 2 O.

Impact of Isomeric Dicarboxylate Ligands on the Formation of One-Dimensional Coordination Polymers and Metallocycles: A Novel cis→trans Isomerization