title: Modification of fulleropyrazolines modulates their cleavage by light.
abstract: The extraordinary electrochemistry and the tunability of their energy levels allows the use of fulleropyrazolines in photovoltaics and charge-transfer systems. Here we show that substitution in position 1 tunes photolytic stability; electron-donating groups facilitate 1,3-dipolar cycloreversion to fullerene. This discovery has implications not only for photovoltaic stability but also highlights a potential strategy for photo-controlled fullerene release systems ('photo-caged'/'photo-activated' fullerene).
authors.affiliation: Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK. Ben.Davis@chem.ox.ac.uk.
authors.forename: Reida N
authors.initials: RN
authors.lastname: Rutte
authors.forename: Thomas B
authors.initials: TB
authors.lastname: Parsons
authors.forename: Benjamin G
authors.initials: BG
authors.lastname: Davis