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BIPHOTONIC SENSITIZATION OF BOND SPLITTING IN ORGANIC MOLECULES AT 77°K: AN EPR STUDY
Author(s) -
Terenin A.,
Rylkov V.,
Kholmogorov V.
Publication year - 1966
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.1751-1097.1966.tb09844.x
Subject(s) - chemistry , photochemistry , phenanthrene , radical , naphthalene , electron paramagnetic resonance , triplet state , energy transfer , molecule , absorption (acoustics) , organic chemistry , materials science , nuclear magnetic resonance , chemical physics , physics , composite material
— The elimination of CH 3 radicals from (CH 3 ) 3 COH and CH 3 I, studied with the EPR method, has been photosensitized at longer wave‐lengths by naphthalene, diphenyl, phenanthrene, the aromatic amines and ketones, and also by dyes. It has been shown that a successive absorption of two photons by the sensitizer is required, raising the sensitizer to a high triplet level, from which the total accumulated energy above the ground one is transferred to the frozen substrate at 77°K. For CH 3 I this is a triplet‐triplet energy transfer. The possibility has been demonstrated of decreasing the primary photon energy by using two sensitizers in succession and achieving a triplet‐triplet energy transfer between them.