Long‐chain silanes as reducing agents part 1: a facile, efficient and selective route to amine and phosphine‐stabilized active Pd‐nanoparticles

Abstract

Recently, metal nanoparticles have found applications in various fields, which have necessitated exploration of new avenues to obtain such materials. In this publication, a hydrosilane-based reduction and characterization of resulting palladium nanoparticles is achieved using palladium acetate as nanoparticle precursor and octadecylsilane as a reducing agent. The influence of phosphine and amine ligands in the stabilization of nanoparticles is also investigated. In addition, a brief mechanistic proposal of the reduction process is also discussed.

Microwave-assisted Synthesis of Hexagonal Gold Nanoparticles Reduced by Organosilane (3-Mercaptopropyl)trimethoxysilane

“…The formation of Au NPs is proposed to take place by the reaction of auric acid with reductive free radical agents including hydroxyl (OH − ) ions and hydrogen (H + ) ions released by hydrolysis of MPTMS. This is consistent to other similar reported works on the reducing properties of reactive silanes [42,43,44,45]. In the study from Motoyama et al [42], different silanes, including poly-(methylhydrosiloxane) (PMHS) and 1,1,3,3-tetramethyldisiloxane (TMDS) were used with iridium-based catalyst by to reduce carboxamide, while octadecylsilane (ODS) was used by Chauhan et al [43] as the reducing agent to reduce palladium acetate and obtain palladium nanoparticles.…”

“…This is consistent to other similar reported works on the reducing properties of reactive silanes [42,43,44,45]. In the study from Motoyama et al [42], different silanes, including poly-(methylhydrosiloxane) (PMHS) and 1,1,3,3-tetramethyldisiloxane (TMDS) were used with iridium-based catalyst by to reduce carboxamide, while octadecylsilane (ODS) was used by Chauhan et al [43] as the reducing agent to reduce palladium acetate and obtain palladium nanoparticles. In the study conducted by Jia et al [44], five different silanes were tested, namely PMHS, triethoxysilane ((EtO) 3 SiH), phenylsilane (PhSiH 3 ), dietheylsilane (Et 2 SiH 2 ) and dimethyl(phenyl)silane (PhMe 2 SiH).…”

Hydridosilane Modification of Metals: An Exploratory Study

“…Tunneling AFM (TAFM) of alkylsilanes on metal substrates would be anticipated to provide the most direct information, but as noted by Owens et al [8], the observation of self-assembled monolayers (SAMs) on metal substrates by TAFM is difficult due to tunneling current requirements [9]. In studies concerning the synthesis of Pd nanoparticles in the presence of trihydridosilanes, Chauhan et al similarly failed to observe silyl hydride absorption bands in infrared studies [10].…”

Shape‐directed platinum nanoparticle synthesis: nanoscale design of novel catalysts

“…The control of shape and size during platinum nanoparticle synthesis is an essential part of designing and studying catalyst materials with improved activity and selectivity. Recent studies which characterized catalysts' shapes and exposed surfaces indicate that surface structures can be altered to tune catalytic properties . It was also shown that high index facets on a catalyst surface may exhibit higher activities than lower index facets for certain reactions due to the decreased coordination of step edges and defects, but these sites can also be detrimental to other reactions .…”

“…WCR has become one of the most common catalyst preparation methods due to the vastly controllable synthetic parameters . Early reports of this method go as far back as 1857 and can be used in systems of gold, palladium, cobalt and silver . Some of the earliest reports of Pt shape direction using WCR were reported in 1941 by Rampino and Nord and then later by El‐Sayed in 1996, but modifications and variations of these syntheses are still being developed today to design catalyst materials with enhanced properties.…”