Types organic-inorganic hybrids

Chemical structures of A-B-A-type organic-inorganic hybrid PEDOT polymers VII. 

Different approaches have been used in the preparation of heterogeneous Sharpless-type catalytic systems for the asymmetric epoxidation of allylic alcohols, although in most cases the chiral induction was modest (50-60%). Li and coworkers described the preparation of an organic-inorganic hybrid chiral catalyst grafted onto the surface of silica and in mesopores of MCM-41, and its successful application in asymmetric epoxidation . Enantiomeric excesses were higher than 80% with conversions in the range 22-76%. 

Thus the sol-gel methodology is an alternative to classical thermodynamic routes for the synthesis of solids. It is also evident that the preparation of the solids through Chimie Douce bridges molecular chemistry and solid state chemistry. This chapter will be focused on material prepared by the sol-gel process, where an organic part is associated with a silica or siloxane Si—O—Si network. Two types of organic-inorganic hybrid materials can be prepared by the sol-gel process and are completely different the nanocomposites and the nanostructured hybrid materials6-9. 

Within the precincts of organic-inorganic hybrid materials, it is worth mentioning an interesting copper-aqua-crown ether complex, supported by a Lindqvist-type POM anion [M06O19]2, obtained by inclusion of the relatively small Cu2+ ion into... 

Niu, J., Zhao, J. Wang, J. et al. (2004) Synthesis, property and crystal structure of a novel two-dimensional network organic-inorganic hybrid compound based on the neodymium center and Keggin-type heteropolyanion of [a- N Journal of Molecular Structure, 699, 85-92. 

Various compounds have been prepared by solvothermal reactions metals, metal oxides, chalcogenides, - ° nitrides, - -" phosphides, open-framework structures, - oxometalate clusters, - organic-inorganic hybrid materials, - - and even carbon nanotnbes. - Most of the solvothermal products are nano- or microparticles with well-defined morphologies. The distribution of the particle size of the prodnct is nsnally qnite narrow, and formation of monodispersed particles is freqnently reported. - When the solvent molecules or additives are preferentially adsorbed on (or have a specific interaction with) a certain surface of the products, growth of the surface is prohibited and therefore products with unique morphologies may be formed by the solvothermal reaction. - - Thus nanorods, wires, tnbes, and sheets of various types of products have been obtained solvothermally. 

The y-isomer of a divacant Keggin-type silicodecatungstate [7-SiWio036] [49] has been used as a precursor for dimetal-substituted POMs involving Ti, V, Cr, Mn, Fe, Mo, and W metals [50-59] and organic-inorganic hybrids [60-63]. The 0x0... 

There are four different types of organic or organic/inorganic hybrid solar cells single-layer, bilayer, bulk heterojunction (BHJ), and dye-sensitized. The basic operation of each device type is described below. 

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