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Ground and Excited State Double Hydrogen Transfer in Symmetric and Asymmetric Potentials: Comparison of 2,7,12,17‐Tetra‐ n ‐propylporphycene with 9‐Acetoxy‐2,7,12,17‐tetra‐ n ‐propylporphycene
Author(s) -
Fita Piotr,
Garbacz Piotr,
Nejbauer Michał,
Radzewicz Czesław,
Waluk Jacek
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201002931
Subject(s) - tetra , excited state , chemistry , state (computer science) , medicinal chemistry , physics , mathematics , atomic physics , algorithm
Analysis of time‐resolved anisotropy of transient absorption enabled determination of room temperature ground and excited state rate constants for intramolecular double hydrogen transfer in two similar porphycenes, one of them with symmetric and the other, with asymmetric character of a double minimum potential for hydrogen motion. The perturbation preserves a quasi‐symmetric minimum in S 0 , but the rate decreases approximately two times. In S 1 , the perturbed potential becomes strongly asymmetric, and the downhill hydrogen transfer occurs with a rate higher than that observed for a symmetrical compound.