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    Regular Two-Dimensional Molecular Array of Photoluminescent Anderson-type Polyoxometalate Constructed by Langmuir-Blodgett Technique

    Year: 2006

    Journal: Langmuir 2006, 22, 2806-2810, 20111221

    Authors: Takeru Ito, Hisashi Yashiro, and Toshihiro Yamase

    Organizations: Chemical Resources Laboratory, Tokyo Institute of Technology, R1-21, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Application Laboratory, Rigaku Corporation, 3-9-12 Matsubara-cho, Akishima-shi, Tokyo 196-8666, Japan, and Core Research for EVolutional Science and Technology, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi 332-0012, Japan

    A regular two-dimensional photoluminescent array of Anderson-type polyoxometalates (POMs) was constructed as built-up Langmuir-Blodgett (LB) films. LB films of hexatungstoantimonate (SbW6) and -manganate (MnW6) were successfully fabricated by using dimethyldioctadecylammonium (DODA) as cationic partner, while hexamolybdochromate (CrMo6) was unsuccessful. Specular X-ray reflectivity (SXR) and grazing incidence X-ray diffraction (GIXD) measurements revealed that both SbW6/DODA and MnW6/DODA LB films exhibited well-ordered layers consisting of periodic arrangement of the planar-structured Anderson-type molecules. Surprising periodicity was observed in SbW6/DODA LB film, in which the distance between SbW6 and DODA layers was 4.40 nm, and SbW6 anions would form a two-dimensional square lattice with a length of 1.4 nm. SbW6/DODA LB films exhibited photoluminescence at 77 K, while emission spectra were observed at room temperature for SbW6 solid.