title: Photochemical site-selective synthesis of [70]methanofullerenes.
abstract: Methanofullerenes such as the well-known [70]PCBM are commonly synthesized under harsh conditions to obtain the product as a mixture of site-isomers (namely α, β and minor γ) due to the D5hsymmetry of the C70cage. We report the first site-selective synthesis of [70]methanofullerenes under light irradiation and low temperatures, thus avoiding time-consuming and highly expensive HPLC separations. Pure major site-isomers α-[70]PCBM and α-[70]DPM have been thus efficiently prepared including the crystal structure of 5b. Photovoltaic preliminary results revealed a slightly beneficial performance for α-pure [70]PCBM site-isomer devices.
authors.affiliation: Organic Chemistry Department, Complutense University of Madrid, Avda. Complutense s/n, 28040 Madrid, Spain. nazmar@ucm.es.
authors.forename: Sara
authors.initials: S
authors.lastname: Vidal
authors.affiliation: Organic Chemistry Department, Complutense University of Madrid, Avda. Complutense s/n, 28040 Madrid, Spain. nazmar@ucm.es.
authors.forename: Marta
authors.initials: M
authors.lastname: Izquierdo
authors.affiliation: Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors.forename: Wai Kit
authors.initials: WK
authors.lastname: Law
authors.affiliation: Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors.forename: Kui
authors.initials: K
authors.lastname: Jiang
authors.affiliation: Organic Chemistry Department, Complutense University of Madrid, Avda. Complutense s/n, 28040 Madrid, Spain. nazmar@ucm.es.
authors.forename: Salvatore
authors.initials: S
authors.lastname: Filippone
authors.affiliation: Single Crystal X-ray Diffraction Laboratory, Interdepartmental Research Service (SIdI), Autonomous University of Madrid, Cantoblanco, 28049 Madrid, Spain.
authors.forename: Josefina
authors.identifier: http://orcid.org/0000-0003-0256-0186
authors.initials: J
authors.lastname: Perles
authors.affiliation: Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors.forename: He
authors.initials: H
authors.lastname: Yan
authors.affiliation: Organic Chemistry Department, Complutense University of Madrid, Avda. Complutense s/n, 28040 Madrid, Spain. nazmar@ucm.es and IMDEA-Nanoscience, Cantoblanco, 28049 Madrid, Spain.
authors.forename: Nazario
authors.initials: N
authors.lastname: Martín