Indole in Argon Matrix: The Near UV Spectra. |
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Authors: | Predrag Ilich Salah S Sedarous |
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Institution: | Department of Biochemistry and Molecular Biology , Mayo Foundation , Rochester, MN, 55905 |
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Abstract: | Abstract The near UV absorption, steady-state polarized fluorescence excitation and time–-resolved fluorescence emission spectra of indole in argon matrix are reported. The absorption maxima of the four lowest singlet transitions were identified at 35095 cm?1(also the S1, 0 0–0 band), 37650 cm?1 (S2,0), 47415 cm?1 (S3,0), and 51680 cm?1 (S4,0). No distinct 0–0 band of the second transition was identified but the linearly polarized, steady-state fluorescence excitation spectrum indicates an onset of weak S2,0 bands on the blue side of the S1,0 0–0 peak (35095 + 400 cm?1). Only one fluorescence emission component, of 4.9±0.2 ns, was obtained by excitation over the S1, 0 0–0 + 565 cm?1 to S1,0 0–0 - 245 cm?1 domain. The reported data strongly suggest the 1Lb ?1A1 and 1La ?1A1assignment for the lowest and next lowest transitions, respectively. |
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