Application of time-resolved step-scan FT-IR to the photodynamics of transition metal complexes and heme proteins

Richard Alan Palmer; Susan E. Plunkett; R. Brian Dyer; Jon Schoonover; Thomas J. Meyer; James L. Chao

doi:10.1117/12.166682

31 January 1994 Application of time-resolved step-scan FTIR to the photodynamics of transition metal complexes and heme proteins

Richard Alan Palmer, Susan E. Plunkett, R. Brian Dyer, Jon Schoonover, Thomas J. Meyer, James L. Chao

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Proceedings Volume 2089, 9th International Conference on Fourier Transform Spectroscopy; (1994) https://doi.org/10.1117/12.166682
Event: Fourier Transform Spectroscopy: Ninth International Conference, 1993, Calgary, Canada

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.

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Richard Alan Palmer, Susan E. Plunkett, R. Brian Dyer, Jon Schoonover, Thomas J. Meyer, and James L. Chao "Application of time-resolved step-scan FTIR to the photodynamics of transition metal complexes and heme proteins", Proc. SPIE 2089, 9th International Conference on Fourier Transform Spectroscopy, (31 January 1994); https://doi.org/10.1117/12.166682

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KEYWORDS

Carbon monoxide

FT-IR spectroscopy

Transition metals

Mirrors

Proteins

Signal processing

Metals

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