Spectroscopy in Supercritical Fluids

Introduction

Vibrational Spectroscopy, particularly infra-red is a key tchnology in most of the research of the Clean Technology Group. Our aim is use spectroscopy to monitor processes in real-time whether they be fast chemical reactions, chemical equilibria, chromatographic separations or lab scale processes. Particularly important applications include:

Time Resolved Infra-Red Spectroscopy: Detecting short lived chemical species on a nanosecond time scale and monitoring their reaction kinetics.
Detection of organometallic reaction intermediates using low temperature techniques.
Fingerprinting of analytes separated by supercritical fluid chromatography.
Optimization of deformation of labile and reactive organometallic compounds in supercritical fluids.
On-line moitoring of continuous processes in supercritical fluids.
Monitoring impregnation and modification of polymers using supercritical fluids.
Characterisation of biocompatible coatings and related materials.

Key Publications

Can Conformational Equilibria be "Tuned" in Supercritical Fluid Solution? An IR Spectroscopic Study of Trans/Gauche Isomerism of Hexafluoro-propan-2-ol in Supercritical SF₆ and CHF₃ Solutions, S. G. Kazarian and M. Poliakoff, J. Phys. Chem, 1995, 99, 8624 - 8.
Can Organometalic Noble Gas Compounds be observed in Fluid Solution at Room Temperature? A Time-resolved Infrared (TRIR) and UV Spectroscopic Study of the Photochemistry of M(CO)₆ (M = Cr, Mo and W) in Supercritical Noble Gas and CO₂ Solution, X-Z. Sun, M. W. George, S. G. Kazarian S. M. Nikiforov and M. Poliakoff, J. Am. Chem. Soc, 1996, 118, 10525-10532
Vibrational Spectroscopy in Supercritical Fluids:- from Analysis and Hydrogen-Bonding to Polymers and Synthesis, M. Poliakoff, S.G. Kazarian and S.M. Howdle, Angewandte Chemie, 1995, 34, 1275-95.
Infrared and Raman Spectroscopy in Supercritical Fluids, S. M. Howdle, M. W. George and M. Poliakoff, chapter in book “Chemical Synthesis in Supercritical Fluids” (W. Leitner and P. G. Jessop) Wiley VCH, Weinheim, 1999, ISBN 3-527-29605-0, 147-164.

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Page created by: Simon Poliakoff

Created: July 1997
Last Revised: January 2001