Using Hydrosilylation To Assemble Organometallic Polymers Containing Combinations of Silicon-Based Functional Groups

Abstract

A set of silicon-based monomers has been prepared by a series of hydrosilylation reactions. These compounds serve as a molecular set of organosilicon compounds from which well-defined oligomers can be assembled. The organic functional groups contained in the monomers include alkynes, diynes, and arylsilanes for use as ligands for transition metals, and also disiloxanes. Depending upon the catalyst and temperature used, it was possible to prepare symmetric or asymmetric molecules from Ph2SiH2, 2. The direct polymerization of these small molecules was limited by the degree to which the concentration of functional groups could be matched; decamers were the highest molecular weight materials prepared. These fragments were also oligomerized with a HSi-terminated silicone to give a functional organosilicone polymer of molecular weight M̄ w = 140 000.

Oligo(alkynylsilanes): Templates for Organometallic Polymers

“…The ligands from which we chose to make polymeric materials are the silanes 1 − 6 , as shown in Chart …”

“…The ligands from which we chose to make polymeric materials are the silanes 1-6, as shown in Chart 1. 18 These all contain two potential sites for transition-metal coordination, namely the alkynyl and aryl groups. Smaller molecules, such as Me 3 SiCtCSiMe 2 (CH 2 ) 3 Si-(H)Ph (1) and (Me 3 SiCtCSiMe 2 (CH 2 ) 3 ) 2 SiPh 2 (2), were used to establish the conditions necessary to selectively attach a transition-metal fragment to one of the two potential ligand binding sites.…”

“…Ligands 1 − 6. The preparation and characterization of these compounds has been discussed previously …”

Characterization of biofunctional thin films deposited by activated vapor silanization

“…Some of the most popular biofunctionalization techniques are self-assembled monolayers (SAMs), 1,2 hydrosilylation, [3][4][5] and silanization. [6][7][8] All of these techniques require tight compatibility between the nature of the substrates and the biofunctionalization precursor molecules, so that their application is restricted to a reduced number of linked materials and molecules.…”

Preparation and physical properties of films prepared by crosslinking 1,9‐bis(glycidyloxypropyl)pentasiloxanes with α,ω‐bis(3‐aminopropyl)polydimethylsiloxane and their settlement and release properties

“…3 Crosslinking is often achieved by free radical processes catalyzed by benzoyl peroxide and heat 4 -7 or by Pt-catalyzed hydrosilylation reactions between polysiloxanes, which have vinyl groups and those with Si-H bonds. 8,9 Silicone elastomers and fluoropolymers have been extensively studied for their potential use as nontoxic, fouling-release coatings. Low energy surfaces are consistent with poor adhesion of most fouling organisms and are easier to clean because of weaker binding at the substratum-liquid interface.…”