title: Organic Monolayers by B(C6F5)3-Catalyzed Siloxanation of Oxidized Silicon Surfaces.
abstract: Inspired by the homogeneous catalyst tris(pentafluorophenyl) borane [B(C6F5)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(C6F5)3as 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 (C8-C18) 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(C6F5)3. This catalyzed reaction path proceeds through a low-barrier-height transition state compared to the noncatalyzed reaction path.
authors.affiliation: Laboratory of Organic Chemistry, Wageningen University and Research , Stippeneng 4, 6708 WE Wageningen, The Netherlands.
authors.forename: Jorge
authors.identifier: 0000-0001-6756-0991
authors.initials: J
authors.lastname: Escorihuela
authors.affiliation: Laboratory of Organic Chemistry, Wageningen University and Research , Stippeneng 4, 6708 WE Wageningen, The Netherlands.
authors.forename: Sidharam P
authors.identifier: 0000-0003-0479-8884
authors.initials: SP
authors.lastname: Pujari
authors.affiliation: Laboratory of Organic Chemistry, Wageningen University and Research , Stippeneng 4, 6708 WE Wageningen, The Netherlands.|Department of Chemical and Materials Engineering, King Abdulaziz University , Jeddah, Saudi Arabia.
authors.forename: Han
authors.identifier: 0000-0001-5773-8506
authors.initials: H
authors.lastname: Zuilhof