Metal Mediated Reactions on Porous Silicon Surfaces

✍ Scribed by Janet M. Holland; Michael P. Stewart; Matthew J. Allen; Jillian M. Buriak

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 157 KB
• Volume: 147
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8248

✦ Synopsis

Reactions that e7ciently form Si}C bonds between silanes and unsaturated carbon}carbon bonds are widely known in molecular, solution phase chemistry. The possibility of covalent functionalization of porous silicon surfaces, which have similar chemical moieties to certain classes of molecular silanes, is intriguing. In this paper we describe approaches toward hydrosilylation of alkynes and alkenes and bis-silylation of alkynes utilizing known solution phase Lewis acid and late transition metal catalysts on silicon hydride terminated porous silicon surfaces. Both EtAlCl 2 and Wilkinson:s catalyst, RhCl(PPh 3 ) 3 , e4ectively induce hydrosilylation of alkynes and alkenes. Bissilylation using palladium-based complexes, however, did not occur and thermally induced hydrosilylation took place in its stead. The Lewis acid mediated hydrosilylation is extremely e7cient and yields highly stabilized surfaces. When Wilkinson:s catalyst and palladium complexes are utilized, on the other hand, extensive oxidation upon exposure to air is observed. 1999 Academic Press