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PHOTOCHEMISTRY OF 1‐PYRENYLDIAZOMETHANE *
Author(s) -
Silva Salom,
Olea Andreas F.,
Thomas J. K.
Publication year - 1991
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1991.tb02050.x
Subject(s) - photoexcitation , intersystem crossing , photochemistry , quantum yield , chemistry , pyrene , excited state , excimer , fluorescence , carbene , molecule , relaxation (psychology) , conical intersection , chemical physics , atomic physics , organic chemistry , physics , singlet state , optics , psychology , social psychology , catalysis
References Photoexcitation of 1‐pyrenyldiazomethane (1) leads to carbenes which attach to various molecules, e.g. surfactants, polymers, hydroxylated surfaces. This provides a convenient method of labelling these compounds with pyrene for probe studies of complex structures and surfaces. Photophysical and photochemical studies of the various events resulting from the photoexcitation of 1, show that the quantum yield for disappearance of 1 and of carbene formation is low (∼ 5%) and that other processes lead to relaxation of excited 1, in particular fluorescence and intersystem crossing. The mechanism involves a mixing of low lying π‐π* states of the pyrene chromaphore with diazo n‐π + states, and is discussed in the light of other similar systems and the present studies.