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Proceedings Paper

Application of time-resolved step-scan FT-IR to the photodynamics of transition metal complexes and heme proteins
Author(s): Richard Alan Palmer; Susan E. Plunkett; R. Brian Dyer; Jon Schoonover; Thomas J. Meyer; James L. Chao
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Paper Abstract

Time-resolved step-scan FT-IR spectroscopy is used to monitor two distinct photo-induced processes. In the first, the third harmonic of a pulsed Nd:YAG laser (355 nm) is used to initiate a metal-to-ligand charge transfer process (MLCT) in a number of Ru(II) and/or Re(I) polypyridyl complexes. Changes in the position and shape of the vibrational signatures of (pi) -backbonding ligands such as CO and/or CN provide information about the changes in oxidation state of the metal resulting from electronic excitation. Changes in the other ligands vibrational bands indicate which is the electron acceptor (radical anion). In the second example demonstrated here, the second harmonic of the Nd:YAG laser (532 nm) pumps into the (beta) -Visible band of carbonmonoxymyoglobin (MbCO). This dissociates the Fe-CO bond of the heme prosthetic group, and the recombination process is observed as indicated by changes in the amide bands of the polypeptide chain. In both cases, these are some of the very few examples of fast (sub-microsecond(s) ) TR FT-IR in the absorbance mode.

Paper Details

Date Published: 31 January 1994
PDF: 2 pages
Proc. SPIE 2089, 9th International Conference on Fourier Transform Spectroscopy, (31 January 1994); doi: 10.1117/12.166682
Show Author Affiliations
Richard Alan Palmer, Duke Univ. (United States)
Susan E. Plunkett, Duke Univ. (United States)
R. Brian Dyer, Los Alamos National Lab. (United States)
Jon Schoonover, Univ. of North Carolina (United States)
Thomas J. Meyer, Univ. of North Carolina (United States)
James L. Chao, Duke Univ. (United States)

Published in SPIE Proceedings Vol. 2089:
9th International Conference on Fourier Transform Spectroscopy
John E. Bertie; Hal Wieser, Editor(s)

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