Issue 21, 2002

An incoherent inelastic neutron scattering investigation of the vibrational spectrum of phenyl-modified (C6H5–) mesoporous silica and its variations in the presence of sorbed benzene (C6H6) and of sorbed deuteriobenzene (C6D6)

Abstract

Mesoporous phenyl-modified silica has been prepared by a co-condensation method and has been characterised via infrared and nuclear magnetic resonance (29Si, 13C) spectroscopies and thermal analysis (TG/DTA). Incoherent inelastic neutron scattering (IINS) at T = 10 K has been used to record vibrational spectra dominated by modes involving motion of hydrogen (1H) for h6-benzene (C6H6) and for phenyl-modified silica (a) outgassed, (b) with an adsorbed monolayer of h6-benzene, (c) with an adsorbed monolayer of d6-benzene (C6D6) and (d) saturated with h6-benzene. Spectral features are assigned and discussed in terms of modes of H-containing Si-attached phenyl groups and benzene molecules in a range of environments. The modes of the phenyl rings are essentially unchanged in the presence of a monolayer. The structural arrangement of pore-filling benzene molecules differs from that in bulk benzene, this being evident in spectral differences.

Article information

Article type
Paper
Submitted
10 Apr 2002
Accepted
11 Sep 2002
First published
26 Sep 2002

Phys. Chem. Chem. Phys., 2002,4, 5394-5399

An incoherent inelastic neutron scattering investigation of the vibrational spectrum of phenyl-modified (C6H5–) mesoporous silica and its variations in the presence of sorbed benzene (C6H6) and of sorbed deuteriobenzene (C6D6)

R. C. T. Slade, C. M. Bambrough and R. T. Williams, Phys. Chem. Chem. Phys., 2002, 4, 5394 DOI: 10.1039/B203531F

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