Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 113, Issue 29, Pages 8169-8175Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp902451k
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan [18350009, 19056004]
- Japan Science and Technology Agency
- Grants-in-Aid for Scientific Research [19056004, 18350009] Funding Source: KAKEN
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Photodissociation spectroscopy of solvated clusters of protonated tryptophan (TrpH(+)) and dipeptides containing tryptophan (Val-TrpH(+), Ala-TrpH(+), and Gly-TrpH(+)) has been carried out at low temperature to investigate the protonation and solvation effects on the electronic spectrum. For the protonated dipeptides, the S-1-S-0 transition exhibits a substantial red shift due to the stronger interaction between the NH3+ group and the indole pi ring. The S-1-S-0 spectra of TrpH(+)(CH3OH)(n) clusters exhibit a drastic change with the number of methanol molecules. This behavior is interpreted in terms of the decrease in the interaction between the pi pi* and the repulsive pi sigma* states. Ala-TrpH(+) and Gly-TrpH(+) exhibit all extensive spectral change with addition of two methanol molecules. This change is ascribed to a conformational change, which is induced by the insertion of solvent molecule in between the NH3+ group and the indole pi ring.
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