title: Intramolecular triplet-triplet energy transfer in oxa- and aza-di-pi-methane photosensitized systems.
abstract: Two different mechanisms are proposed for the intramolecular triplet-triplet energy transfer in oxa- and aza-di-pi-methane systems, one thermally induced and the other photoinduced. These mechanisms involve a key structure that corresponds to an avoided crossing. The triplet sensitized photochemistry of these compounds, focusing attention in the di-pi-methane rearrangement, is discussed in light of these proposed mechanisms.
authors.forename: Luis M
authors.initials: LM
authors.lastname: Frutos
authors.forename: Unai
authors.initials: U
authors.lastname: Sancho
authors.forename: Obis
authors.initials: O
authors.lastname: Castaño