Hydroxides / Photosensitive Polymer Nano-composite Multi-layer Film Preparation, Characterization And Photoinduced Interaction Studies

The fabrication of self-assembled ultrathin film has recently attracted considerable interest in view of their importance to nanomaterials with tailored structures and properties . The layer-by-layer (LbL) self-assembly method, initially developed for pairs of oppositely charged polyelectrolytes , is a facile and versatile technique that has lately emerged as a viable approach to prepare large area ultrethin films. Because the composition, thickness, and components of each layer in the film can be controlled, the LbL technique provides a route to fabricate various regular structures at the molecule level, which offers potential advantages for device application. Polyoxometalates (POM), a class of molecularly defined inorganic metal-oxide cluster, hold intriguing structures and unexpected properties, and attract increasing attention worldwide .In addition, a diazo resin can link POMs by electrostatic interactions between the cationic diazonium group (-N2+) and the anionic POMs (O-) in order to form a LbL ultrathin film. Since the photosensitive diazo resin could easily decomposes under UV irradiation, the electrostatic interaction between -N2+ and O- may partly transformed into covalent linkage under UV light [15]. For this consideration, we attempt to enhance the stability of multilayer films by photoinduced interaction between POMs and photosensitive polymers. Here we reported the preparation and characterization of one kind stable multilayer films constructed by polyoxometalates(POMs) and diazo resin.Polyoxometalates(POMs) are a well-known and significant class of inorganic compounds and currently receiving much attention because of their chemical, structural and electronic versatility and their wideapplications in many fields such as catalysis, medicine,biology,and materials science. Moreover, the syntheses of various polyoxometalate help to obtain new information of intermolecular interaction,which is apparently important for rational design and construction of new framework structures.One of the interesting aspects of octamolybdates, Mo8O264-,is seen in varied structural flexibility in solution. In this paper,we simply studied the reaction mechanism of the transfer of the heptamolybdate into octamolybdate, invested the influence of different cations to the stability of polyoxoanions. We first report the synthesis and crystal structure of [(CH3)4N]4Mo8O26.