The syntheses and structures of two new Zn(II) complexes, a 2D graphite-like layer {[Zn(PIA)H2 O]⋅H2 O}n (1) and an independent 1D single-walled metal-organic nanotube (SWMONT) {[Zn2 (PIA)2 (bpy)2 ]⋅2.5 H2 O⋅DMA}n (2), have been reported based on a "Y"-shaped 5-(pyridine-4-yl)isophthalic acid ligand (H2 PIA). Interestingly, the 2D graphite-like layer in 1 can transform into the independent 1D SWMONT in 2 with addition of 2,2'-bipyridine (bpy), which represents the first successfully experimental example of an independent 1D metal-organic nanotube generated from a 2D layer by a "rolling-up" mechanism.

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The title complex, {[Ni(C15H11N4O2S)2(C10H8N2)(H2O)2]·H2O}n, was synthesized by the reaction of nickel chloride, 4-{[(1-phenyl-1H-tetrazol-5-yl)sulfanyl]methyl}benzoic acid (HL) and 4,4'-bipyridine (bpy) under hydrothermal conditions. The asymmetric unit contains two half Ni(II) ions, each located on an inversion centre, two L(-) ligands, one bpy ligand, two coordinated water molecules and one unligated water molecule. Each Ni(II) centre is six-coordinated by two monodentate carboxylate O atoms from two different L(-) ligands, two pyridine N atoms from two different bpy ligands and two terminal water molecules, displaying a nearly ideal octahedral geometry. The Ni(II) ions are bridged by 4,4'-bipyridine ligands to afford a linear array, with an Ni...Ni separation of 11.361 (1) Å, which is further decorated by two monodentate L(-) ligands trans to each other, resulting in a one-dimensional fishbone-like chain structure. These one-dimensional fishbone-like chains are further linked by O-H...O, O-H...N and C-H...O hydrogen bonds and π-π stacking interactions to form a three-dimensional supramolecular architecture. The thermal stability of the title complex was investigated via thermogravimetric analysis.