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    Langmuir-Blodgett Films of a Mo-Blue Nanoring [Mo142O429H10(H2O)49(CH3CO2)5(CH3CH2CO2)]30- (Mo142) by the Semiamphiphilic Method

    Year: 2007

    Journal: Langmuir, 2007, 23 (7), pp 4042–4047, 20111221

    Authors: Miguel Clemente-León, Takeru Ito, Hisashi Yashiro, Toshihiro Yamase, and Eugenio Coronado

    Organizations: Instituto de Ciencia Molecular, Universidad de Valencia, Polígono de la Coma s/n, 46980 Paterna, Spain, 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 “Creation of bio-devices and bio-systems with chemical and biological molecules for medical use”, CREST, Japan Science and Technology Agency (JST)

    Langmuir monolayers and LB films of the ring-shaped mixed-valence polyoxomolybdate [Mo142O429H10(H2O)49(CH3CO2)5(CH3CH2CO2)]30- (Mo142) dissolved in the aqueous subphase have been successfully fabricated by using the adsorption properties of a DODA monolayer. Infrared and ultraviolet−visible spectroscopy of the LB films indicates that Mo142 and DODA molecules are incorporated within these LB films. X-ray reflectivity experiments indicate that the LB films exhibit a well-defined lamellar structure formed by bilayers of DODA molecules alternating with monolayers of Mo142. Using behenic acid-modified hydrophobic quartz substrate is critical for the formation of the well-defined lamellar structure. From the values of the periodicity obtained by these experiments it is clear that the Mo142 clusters lie flat along the charged organic layers. AFM images also showed the flat and homogeneous films on the quartz substrates treated with behenic acid. Cyclic voltammograms of Mo142-LB films deposited on ITO substrates showed quasi-reversible oxidation/reduction waves with positive shift of the potential compared to the case of solution.