Nano-fiim structures constructed by self-assembly of co(lll) biuretato complexes and long alkyl imidazolium cations

Kazuki Yamada, Yuki Okazaki, Tomohiko Inomata, Keita Kuroiwa, Nobuo Kimizuka, Tomohiro Ozawa, Yasuhiro Funahash, Hideki Masuda

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    1 Citation (Scopus)


    A Co(III) biuretato complex, [Co III{ph(biu) 2)] (ph(biu) 2 = o-phenylenebis(biuretato)) can form layer structures by its self-assembling with a multiply hydrogen bonding network. PPh 4[Co III{ph(biu) 2)]. 3CHCL 3 (PPh 4 + = Tetraphenylphosphonium cation) crystallizes in the triclinic, space group P1, with a = 9.740(5) A, b = 13.980(8) A, c = 16.792(9) A, a = 103.976(7)°, 13 = 95.592(8)°, 'y = 103.1 65(8)°, V = 2132 A, and Z = 2. In the crystal, counter cations, PPh, are inserted between the layer structures of [Co III{ph(biu) 2}] - aggregates, resulting in formation of a multi-layered structure. A treatment of K[Co III{ph(biu) 2}] with C 18MelmCl (C 18Mel m + = 1 -octadecyl-3-methyl-imidazolium cation) in an aqueous solution with a trace amount of PPh 4Cl, gave the glaring silver solution containing self-organized nano-film structures. Optical microscopic and AFM studies clearly showed that rectangle-shaped nano-film structures were formed by self-assembly of [Co III{ph(biu) 2}] - and C 18Melm + in the solution, and their sizes were approximately ranged to 6∼13 μm in length, 3∼7 μm in width and 25.2 ± 6.2 nm in thickness. Using spectroscopic and XRD data, we concluded that these nano-films have a alternatively accumulated multilayer-structure of [Co III{ph(biu) 2}] - layer and C 18Melm + bilayer structures, the repeating distance being d 001 = 2.22 nm.

    Original languageEnglish
    Pages (from-to)307-312
    Number of pages6
    JournalJournal of nanoscience and nanotechnology
    Issue number1
    Publication statusPublished - Jan 2009

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Biomedical Engineering


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