Single-crystalline metallic nanowires, Ni, Ag, and Zn, were successfully fabricated using an anodic aluminium oxide (AAO) template by electro-deposition. The single-crystalline Ni and Ag nanowires showed face-centred cubic (fcc) structure with a preferred orientation along the [220] direction. Zn nanowires with hexagonal close-packed (hcp) structure also had preferred orientation along [220]. The structure of metallic nanowires depended on the deposition conditions and can be controlled by the conditions. Thermodynamics and electrochemistry were employed to analyse the growth mechanism. The competition among the nuclei and subsequent coalescence contributed to the formation of columnar structure within the nanopores of AAO, and H-adsorption led to the preferred orientation and single crystallinity.
Four Zn(II) coordination polymers (CPs), namely, [Zn(3-bpdb)(MeO-ip)] n (1), [Zn(3-bpdb)(EtO-ip)] n (2), {[Zn(3-bpdb)(n-PrO-ip)]•H 2 O} n (3), and [Zn(3-bpdb)(n-BuOip)] n (4), have been first prepared under solvothermal conditions on the basis of four 5-substituted isophthalic acid ligands including 5-methoxy-1,3-benzenedicarboxylate (MeO-H 2 ip), 5-ethoxy-1,3benzenedicarboxylate (EtO-H 2 ip), 5-propoxy-1,3-benzenedicarboxylate (n-PrO-H 2 ip), and 5-butoxy-1,3-benzenedicarboxylate (n-BuO-H 2 ip) with the help of 1,4-bis(3-pyridyl)-2,3-diaza-1,3butadiene (3-bpdb) as a secondary ligand. CPs 1 and 2 exhibit double pillared layered three-dimensional (3D) structures with non-interpenetrated fsc topology. CP 3 possesses a two-dimensional (2D) terrace layered structure with (4 2 .6)(4 2 .6 7 .8) topology, while CP 4 features a one-dimensional (1D) infinite tubular helical chain. Second, when the orange-yellow crystals of 4 were immersed in the mother liquor at room temperature, vivid bright yellow crystals of {[Zn(3-bpdb)(n-BuO-ip)]•2H 2 O} n (5) with a 2D terrace layered structure and bright yellow crystals of {[Zn(3-bpdb)(n-BuO-ip)(H 2 O)]•1.5H 2 O} n (6) with a single-layered 2D (4,4) grid network were obtained on the 8th and 20th days by single-crystalto-single-crystal (SCSC) phase transformation, respectively. These structural transformations were thoroughly studied by powder Xray diffraction (PXRD) analysis and field-emission scanning electron microscopy (FE-SEM) along with single-crystal X-ray diffraction. In order to clarify the structure control factors in this series of CPs, similar reactions with 1−4 were continuously carried out, except that Zn(NO 3 ) 2 •6H 2 O was replaced by Co(NO 3 ) 2 •6H 2 O, and four Co(II)-based CPs formulated as [Co(3-bpdb)(MeOip)] n (7), [Co(3-bpdb)(EtO-ip)] n (8), {[Co(3-bpdb)(n-PrO-ip)]•H 2 O} n (9), and [Co(3-bpdb)(n-BuO-ip)] n (10) were purposefully constructed. The whole structures of 7−10 are isostructural with 1−3 and 5, respectively. The present results reveal that substitutions of isophthalic acid ligands with different lengths exert significant effects on the architecture of the CPs. Besides, the fluorescent properties of 1−6 were also investigated. The magnetic measurements indicate that CP 7 exhibits weak antiferromagnetic interactions, and CPs 8−10 exhibit weak ferromagnetic interactions within the binuclear (Co II ) 2 units. Magnetostructure relationships were investigated as well.
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