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Picosecond transient resonance Raman study on the excited‐state conformational dynamics of a highly ruffled nickel porphyrin
Author(s) -
Jeong Dae Hong,
Kim Dongho,
Cho Dae Won,
Jeoung Sae Chae
Publication year - 2001
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.713
Subject(s) - excited state , picosecond , raman spectroscopy , nanosecond , resonance raman spectroscopy , chemistry , resonance (particle physics) , photoexcitation , conformational isomerism , nickel , photochemistry , porphyrin , analytical chemistry (journal) , atomic physics , molecule , laser , optics , physics , organic chemistry
Picosecond to nanosecond transient resonance Raman spectroscopy was applied to track down the excited‐state conformational excursions of Ni II T( t ‐Bu)P [nickel(II) 5,10,15,20‐tetra‐ tert ‐butylporphyrin] in various solvents with different dielectric properties. From the resonance Raman spectra of Ni II T( t ‐Bu)P obtained by picosecond pulse photoexcitation, the α 4 ‐type conformer was suggested to be dominant in the 1 (d,d) excited state at the initial stage of deactivation processes (∼3 ps). However, only one conformer of αβαβ type was found to persist on the nanosecond time‐scale. We also observed that the initial formation of the 1 (d,d) excited state of Ni II T( t ‐Bu)P from the 1 (π,π*) excited state is independent of the solvent, but the subsequent decay of the 1 (d,d) to the ground state is strongly solvent dependent. Copyright © 2001 John Wiley & Sons, Ltd.