A simple access to ω-aminoalkyltrialkoxysilanes: Tunable linkers for self-organised organosilicas

A simple route to ω-aminoalkyltriethoxysilanes with variable alkylene chain lengths, (EtO)3Si(CH2)nNH2 (n = 5, 11) is described. These silyl linkers have been used to prepare urea-based compounds with H-bonding and hydrophobic interactions which enable the self-assembly of the molecules. These molecular precursors are suitable for the obtention of nano-structured hybrid silicas.

ω-Aminoalkyltrialkoxysilanes with variable chain linkers is directly available via a simple route by the reaction of NaN3 with ω-bromoalkyltrialkoxysilanes followed by hydrogenation with palladium catalyst. The reaction of 5-aminopentyltriethoxysilane with 1,4-diisocyanatobenzene led to the corresponding 1,4-bisurea derivative which under acid catalysed hydrolysis led to a lamellar hybrid.Figure optionsDownload as PowerPoint slide