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Inspired by the homogeneous catalyst tris(pentafluorophenyl) borane [B(C 6 F 5 ) 3 ], which acts as a promotor of Si-H bond activation, we developed and studied a method of modifying silicon oxide surfaces using hydrosilanes with B(C 6 F 5 ) 3 as the catalyst. This dedihydrosiloxanation reaction yields complete surface coverage within 10 min at room temperature. Organic monolayers derived from hydrosilanes with varying carbon chain lengths (C 8 -C 18 ) were prepared on oxidized Si(111) surfaces, and the thermal and hydrolytic stabilities of the obtained monolayers were investigated in acidic (pH 3) medium, basic (pH 11) medium, phosphate-buffered saline (PBS), and deionized water (neutral conditions) for up to 30 days. DFT calculations were carried out to gain insight into the mechanism, and the computational results support a mechanism involving silane activation with B(C 6 F 5 ) 3 . This catalyzed reaction path proceeds through a low-barrier-height transition state compared to the noncatalyzed reaction path.

Organic Monolayers by B(C6F5)3-Catalyzed Siloxanation of Oxidized Silicon Surfaces

Organic Monolayers by B(C₆F₅)₃-Catalyzed Siloxanation of Oxidized Silicon Surfaces