Nanostructuring of Bridged Organosilane Precursors with Pendant Alkyl Chains
authors Nunes, SC; Burglova, K; Hodacova, J; Ferreira, RAS; Carlos, LD; Almeida, P; Cattoen, X; Man, MWC; Bermudez, VD
nationality International
journal EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
author keywords Layered compounds; Nanostructures; Sol-gel processes; Self-assembly; Click chemistry
keywords H STRETCHING MODES; SOLID-STATE NMR; HYBRIDS; CONFORMATION; MONOLAYERS; SILSESQUIOXANES; SPECTROSCOPY; HYDROLYSIS; SILICATES; MOBILITY
abstract The copper-catalyzed alkyne azide cycloaddition (CuAAC) reaction was combined with sol-gel reactions for the production of bridged silsesquioxanes (BSs) in which hexyl and icosanyl chains are pendant and anchored on a single position to a triazole ring. The influence of the alkyl chain length on the structure of the BSs, represented by the notation Cn/siloxane (where n = 6 and 20), was examined. The C20/siloxane hybrid is a hydrophobic material that exhibits a hierarchically structured lamellar bilayer organization, a texture composed of microplates of nanometer thickness, and a reversible time-independent order/disorder phase transition (onset at 60 degrees C). The driving forces for self-assembly are van der Waals interactions between the icosanyl chains and - interactions between the triazole rings. In the essentially amorphous C6/siloxane hybrid, the latter contribution promotes the genesis of a pre-lamellar phase similar to that found in C20/siloxane.
publisher WILEY-V C H VERLAG GMBH
issn 1434-1948
year published 2015
issue 7
beginning page 1218
ending page 1225
digital object identifier (doi) 10.1002/ejic.201402673
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000350764600017
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journal impact factor 2.507
5 year journal impact factor 2.381
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