Chemical modification of poly(n-hexylsilane) – Synthesis of functional polysilanes bearing thienyl groups on the appended sila-alkyl side chains and their application in the generation and stabilization of silver nanoparticles

Highly selective addition of cyclosilanes to alkynes enabling new conjugated materials

Hybrid σ,π-conjugated cyclosilanes were synthesized via highly selective hydrosilylation and have shown great potentials as building blocks to construct novel conjugated polymers with control of tacticity.

A metal-free radical technique for cross-linking of polymethylhydrosiloxane or polymethylvinylsiloxane using AIBN

A new method was developed for the metal-free cross-linking of silicone rubbers. This process uses azobisisobutyronitrile (AIBN) to selectively react with Si-H and vinyl groups as a free-radical initiator for the thermal curing of polymethylhydrosiloxane (PMHS) and polymethylvinylsiloxane (PMVS). The AIBN-initiated curing reaction between the Si-H groups of PMHS generated Si-O-Si and Si-Si cross-links. In contrast, PMVS was cured via the formation of C-C bonds through "methyl-vinyl" and "vinyl-vinyl" mechanisms. Curing reactions were performed at 80-120 °C in air and confirmed by 13C and 29Si solid state NMR analyses and swelling trials.

Borane-catalysed postpolymerisation modification of the Si–H bonds in poly(phenylsilane)

An unusually wide variety of new sidechains are introduced at a polysilane through chemoselective catalytic hydrosilation, heterodehydrocoupling, and demethanative coupling.

Spectroscopic investigation of S-Ag interaction in omega-mercaptoundecanoic acid capped silver nanoparticles

This paper deals with the synthesis of omega-mercaptoundecanoic acid (MUA) capped silver nanoparticles (NPs) with an average size of 15nm by citrate reduction technique and spectroscopic investigation of S-Ag interaction. We have studied the interaction of thiol with silver NPs in aqueous medium by employing UV-vis, Raman, FT-IR, and photoluminescence spectroscopy. The shifting of silver surface plasmon band in the UV-vis spectra shows the stabilization of the silver nanoparticles by MUA. The disappearance of S-H stretching in both the FT-IR and Raman spectra and the shifting of the NMR signals of the protons in close proximity to the metal center supported the existence of the S-Ag interaction in MUA capped silver NPs. The morphology of the thiol protected silver NPs was investigated by transmission electron microscopy (TEM) and was found to be distinct and spherical entities.

Formation of metal nanoparticles on the surface of polymer particles incorporating polysilane by UV irradiation

Polystyrene particles incorporating poly(methylphenylsilane) (PMPS) were synthesized by miniemulsion polymerization. UV irradiation of the emulsion under air in the presence of metal salts such as HAuCl4.4H2O, AgNO3, and Na2PdCl4 led to the formation of metal nanoparticles on the surface of polymer particles; thus, metal nanoparticle/polymer hybrid particles were obtained. The structures of the hybrid particles were confirmed by the surface plasmon resonance band and transmission electron microscopy images. The formation of metal nanoparticles depended on the functional groups and charge on the surface of the polymer particle. The metal nanoparticles were formed due to the reduction of metal ions, accompanied by the oxidation of PMPS. The interaction between the surface of the polymer particle and the metal ions plays an important role in the formation of the metal nanoparticle.