Spatially confined redox chemistry in periodic mesoporous hydridosilica-nanosilver grown in reducing nanopores
Author
Dag, Ö.
Henderson, E. J.
Wang, W.
Lofgreen, J. E.
Petrov, S.
Brodersen, P. M.
Ozin, G. A.
Date
2011Source Title
Journal of the American Chemical Society
Print ISSN
0002-7863
Electronic ISSN
1520-5126
Publisher
American Chemical Society
Volume
133
Issue
43
Pages
17454 - 17462
Language
English
Type
ArticleItem Usage Stats
116
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Abstract
Periodic mesoporous hydridosilica, PMHS, is shown for
the first time to function as both a host and a mild reducing agent toward
noble metal ions. In this archetypical study, PMHS microspheres react
with aqueous Ag(I) solutions to form Ag(0) nanoparticles housed in
different pore locations of the mesostructure. The dominant reductive
nucleation and growth process involves SiH groups located within the
pore walls and yields molecular scale Ag(0) nanoclusters trapped and
stabilized in the pore walls of the PMHS microspheres that emit orangered photoluminescence. Lesser processes initiated with pore surface SiH
groups produce some larger spherical and worm-shaped Ag(0) nanoparticles within the pore voids and on the outer surfaces of the PMHS microspheres. The intrinsic reducing power demonstrated in
this work for the pore walls of PMHS speaks well for a new genre of chemistry that benefits from the mesoscopic confinement of
Si H groups.