Ito Takeru, Yashiro Hisashi, Yamase Toshihiro
Chemical Resources Laboratory, Tokyo Institute of Technology, R1-21, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
Langmuir. 2006 Mar 14;22(6):2806-10. doi: 10.1021/la052972w.
A regular two-dimensional photoluminescent array of Anderson-type polyoxometalates (POMs) was constructed as built-up Langmuir-Blodgett (LB) films. LB films of hexatungstoantimonate (SbW(6)) and -manganate (MnW(6)) were successfully fabricated by using dimethyldioctadecylammonium (DODA) as cationic partner, while hexamolybdochromate (CrMo(6)) was unsuccessful. Specular X-ray reflectivity (SXR) and grazing incidence X-ray diffraction (GIXD) measurements revealed that both SbW(6)/DODA and MnW(6)/DODA LB films exhibited well-ordered layers consisting of periodic arrangement of the planar-structured Anderson-type molecules. Surprising periodicity was observed in SbW(6)/DODA LB film, in which the distance between SbW(6) and DODA layers was 4.40 nm, and SbW(6) anions would form a two-dimensional square lattice with a length of 1.4 nm. SbW(6)/DODA LB films exhibited photoluminescence at 77 K, while emission spectra were observed at room temperature for SbW(6) solid.
通过层层组装的朗缪尔-布洛杰特（LB）膜构建了安德森型多金属氧酸盐（POM）的规则二维光致发光阵列。以二甲基二十八烷基铵（DODA）作为阳离子配体，成功制备了六钨锑酸盐（SbW(6)）和六钨锰酸盐（MnW(6)）的LB膜，而六钼铬酸盐（CrMo(6)）则未成功制备。镜面X射线反射率（SXR）和掠入射X射线衍射（GIXD）测量表明，SbW(6)/DODA和MnW(6)/DODA的LB膜均呈现出由平面结构的安德森型分子周期性排列组成的有序层。在SbW(6)/DODA的LB膜中观察到了惊人的周期性，其中SbW(6)层与DODA层之间的距离为4.40 nm，且SbW(6)阴离子将形成边长为1.4 nm的二维正方形晶格。SbW(6)/DODA的LB膜在77 K时呈现光致发光，而SbW(6)固体在室温下观察到发射光谱。
