One-step template-directed synthesis of multifunctionalised nanoporous silica: on the way to interactive nanomaterials

Abstract

The preparation of multifunctional mesoporous silica containing a NLO chromophore in the framework (bridged azobenzene phosphonium salts) and mercaptopropyl groups able to stabilize gold(0) nanoparticles in the channel pores was achieved in one step by using the direct liquid crystal templating approach.

Mesoporous Hybrid Thin Films: The Physics and Chemistry Beneath

“…Transparent films containing light‐responsive functions can be combined with nonlinear optical chromophores to produce multifunctional photonic devices 8. 9…”

“… Different synthesis strategies to achieve “pore engineering”, by selectively locating organic functions within walls or on a pore surface: a) one‐pot synthesis using two different organoalkoxides (reference 9), b) one‐pot synthesis followed by post‐grafting on the remaining surface sites (reference 72), c) post‐grafting of a bridged function, followed by cleavage and exposure of the new functions (reference 94), d) double post‐grafting followed by cleavage, leading to functional cavities with defined size and shape (adapted from reference 71). …”

Photoswitchable phosphines in catalysis

“…[15c,18] Alternatively, lithiated azobenzenes have been reacted with ClP(S)Ph 2 and the corresponding phosphines 10 have been obtained then by desulfuration with tributylphosphine (Scheme 5). [19] Palladium(II)-promoted couplings of iodo-azobenzenes with secondary phosphines (Ar 2 PH) are typified in Scheme 6 by the synthesis of phosphines bearing hydroxyl (or alkoxy) and sulfonate functions, reported by Corriu [20] and Monflier [21] respectively (Scheme 6a-b). These reactions were performed by heating the substrates mixtures at 100-135°C in the presence of Pd(OAc) 2 .…”

“…Palladium(II)‐promoted couplings of iodo‐azobenzenes with secondary phosphines (Ar 2 PH) are typified in Scheme 6 by the synthesis of phosphines bearing hydroxyl (or alkoxy) and sulfonate functions, reported by Corriu [20] and Monflier [21] respectively (Scheme 6a–b). These reactions were performed by heating the substrates mixtures at 100–135 °C in the presence of Pd(OAc) 2 .…”

A Simple and Efficient Route to Active and Dispersed Silica Supported Palladium Nanoparticles

“…The presence of some functional groups on the support surface also plays a very important role in the phenomenon of particle agglomeration [19][20][21] as well as in the catalytic efficiency of the materials [20][21][22][23][24][25][26]. Furthermore, the conventional preparation of metal nanoparticles involves the use of reducing agents including NaBH 4 , hydrazine and molecular hydrogen which are not necessarily needed in many cases [8].…”