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Halasa A, Reva I, Lapinski L, et al. Conformers of Kojic Acid and Their Near-IR-Induced Conversions: Long-Range Intramolecular Vibrational Energy Transfer. J Phys Chem A. 2016;120(17):2647-56doi: 10.1021/acs.jpca.6b01275.
Halasa, A., Reva, I., Lapinski, L., Rostkowska, H., Fausto, R., & Nowak, M. J. (2016). Conformers of Kojic Acid and Their Near-IR-Induced Conversions: Long-Range Intramolecular Vibrational Energy Transfer. The journal of physical chemistry. A, 120(17), 2647-56. https://doi.org/10.1021/acs.jpca.6b01275
Halasa, Anna, et al. "Conformers of Kojic Acid and Their Near-IR-Induced Conversions: Long-Range Intramolecular Vibrational Energy Transfer." The journal of physical chemistry. A vol. 120,17 (2016): 2647-56. doi: https://doi.org/10.1021/acs.jpca.6b01275
Halasa A, Reva I, Lapinski L, Rostkowska H, Fausto R, Nowak MJ. Conformers of Kojic Acid and Their Near-IR-Induced Conversions: Long-Range Intramolecular Vibrational Energy Transfer. J Phys Chem A. 2016 May 05;120(17):2647-56. doi: 10.1021/acs.jpca.6b01275. Epub 2016 Apr 21. PMID: 27070389.
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J Phys Chem A. 2016 May 05;120(17):2647-56. doi: 10.1021/acs.jpca.6b01275. Epub 2016 Apr 21.

Conformers of Kojic Acid and Their Near-IR-Induced Conversions: Long-Range Intramolecular Vibrational Energy Transfer.

The journal of physical chemistry. A

Anna Halasa, Igor Reva, Leszek Lapinski, Hanna Rostkowska, Rui Fausto, Maciej J Nowak

Affiliations

  1. Institute of Physics, Polish Academy of Sciences , Al. Lotnikow 32/46, 02-668 Warsaw, Poland.
  2. CQC, Department of Chemistry, University of Coimbra , 3004-535 Coimbra, Portugal.

PMID: 27070389 DOI: 10.1021/acs.jpca.6b01275

Abstract

Conformational transformations were investigated for molecules of kojic acid trapped in low-temperature argon and nitrogen matrixes. Two conformers, differing from each other by 120° rotation of the hydroxymethyl (-CH2OH) moiety, were found to be populated in freshly deposited matrixes, prior to any irradiation. Matrixes containing isolated monomers of kojic acid were irradiated with narrowband, tunable near-infrared (near-IR) laser light. Excitations at wavenumbers corresponding to the overtone of the stretching vibration of the OH bond of the hydroxymethyl group led to conversion of one of the observed conformers into another. The direction of this conformational transformation depended on the wavenumber (within the 7126-7115 cm(-1) range) used for irradiation. The same conformational photoconversion was also observed to occur upon narrowband irradiation at much lower wavenumbers (from the 6468-6447 cm(-1) range). Near-IR light from this range selectively excites overtone vibrations of the OH group directly attached to the heterocyclic ring. Such an observation provides a convincing evidence of a long-range vibrational energy transfer from the initially excited OH group (directly attached to the ring) to the remote hydroxymethyl fragment which changes its orientation. Structural changes, occurring in matrix-isolated molecules of kojic acid upon near-IR excitation, were monitored by FTIR spectroscopy.

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