A Novel Route to Organic–Inorganic Hybrid Nanomaterials

Abstract

In the present work, the application of electron‐deficient tetraphenylporphyrinatovanadium(IV) trifluoromethanesulfonate, [VIV(TPP)(OTf)2], in the trimethylsilylation of alcohols and phenols with hexamethydisilazane (HMDS) is reported. This new V(IV) catalyst was used as an efficient catalyst for silylation of not only primary alcohols but also sterically hindered secondary and tertiary alcohols with HMDS. Trimethylsilylation of phenols with HMDS was also performed to afford the desired Trimethylsilyl ethers (TMS) ethers. The chemoselectivity of this method was also investigated. This catalyst can be reused several times without loss of its activity. Copyright © 2011 John Wiley & Sons, Ltd.

Fluorescent hybrid organic–inorganic particles: influence of physical encapsulation versus covalent attachment on leaching and UV stability

“…It has been reported that monomers with a single trialkoxysilyl group segregate to the surface of particles during polymerizations 46), 47) and bridged monomers with two trialkoxysilyl groups are more homogeneously distributed. 48) Dansyl amides experience a substantial bathochromic shift in fluorescence emission maximum with increasing solvent polarity making them useful in probing materials' microenvironments.…”

Surface-initiated controlled radical polymerizations from silica nanoparticles, gold nanocrystals, and bionanoparticles

“…Due to the living character of CRP techniques, it is possible to continue the polymerization with a second monomer after consumption of the first monomer, which leads to block copolymer-grafted silica nanoparticles. 138,148 Correspondingly, the number-average molecular weight (Mn) of grafted PSt is 3.6, 6.2, 8.9, 12.0, 14.3, and 15.4 kg/mol, respectively. The images of the PSt silica nanohybrids show micrometer-sized polymer film domains containing a monolayer of silica nanoparticles.…”

“…95,137,147,178,179 Additionally, free polymers produced by the sacrificial free initiator form an entangled network structure which prevents nanoparticle diffusion, diminishes interparticle coupling, and avoids gelation or aggregation. 95,137,147,178,179 Up to now, utilizing surface-initiated ATRP, various synthetic polymers such as PSt, 41,138,148,161,162 PMMA, 139,147,148,162,177 poly(n-butyl acrylate) (PnButA), 94 142 as well as polyelectrolytes 142,151,[163][164][165] have been grafted from silica nanoparticles (Table 1). Due to the living character of CRP techniques, it is possible to continue the polymerization with a second monomer after consumption of the first monomer, which leads to block copolymer-grafted silica nanoparticles.…”

Facile synthesis of silica-polymer hybrids via simultaneous RAFT process and hydroxyl-alkoxysilane coupling reaction

“…Synthesis and properties of inorganic-organic hybrid materials have attracted much attention due to their potential applications in many fields involving materials science and biotechnique [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Among them, silica particles are solid supports of choice to construct the target hybrids due to their excellent mechanical stability, low costs and variable particle sizes and specific surface area [1][2][3][4].…”