title: Purification and electronic characterisation of 18 isomers of the OPV acceptor material bis-[60]PCBM.
abstract: The as-produced isomer mixture of the organic photovoltaic device acceptor material bis-[60]PCBM has been purified into its constituents by peak-recycling HPLC, and those individual isomers were characterised by UV-Vis absorption spectroscopy and cyclic voltammetry. A total of 18 isomers were purified from the mixture to a standard exceeding 99.5% with respect to other isomers. The HOMOs, LUMOs, and HOMO-LUMO gaps of the purified isomers vary from -5.673 to -5.444 eV, -3.901 to -3.729 eV, and 1.664 to 1.883 eV, respectively. We also find a correlation between HPLC retention time and the relative positions of the addends; in that generally the closer the addends are to each other the longer the retention time of the isomer, and vice versa.
authors.affiliation: School of Physics and Astronomy, Queen Mary University of London, Mile End Road, London, E1 4NS, UK. j.dennis@qmul.ac.uk.
authors.forename: W
authors.initials: W
authors.lastname: Shi
authors.affiliation: School of Physics and Astronomy, Queen Mary University of London, Mile End Road, London, E1 4NS, UK. j.dennis@qmul.ac.uk.
authors.forename: X
authors.initials: X
authors.lastname: Hou
authors.affiliation: School of Physics and Astronomy, Queen Mary University of London, Mile End Road, London, E1 4NS, UK. j.dennis@qmul.ac.uk.
authors.forename: T
authors.initials: T
authors.lastname: Liu
authors.affiliation: School of Physics and Astronomy, Queen Mary University of London, Mile End Road, London, E1 4NS, UK. j.dennis@qmul.ac.uk.
authors.forename: X
authors.initials: X
authors.lastname: Zhao
authors.affiliation: Solenne BV, Zernikepark 6, 9747AN, Groningen, The Netherlands.
authors.forename: A B
authors.initials: AB
authors.lastname: Sieval
authors.affiliation: Stratingh Institute for Chemistry and Zernike Institute for Advanced Materials University of Groningen, Nijenborgh 4, 9747AG, Groningen, The Netherlands.
authors.forename: J C
authors.initials: JC
authors.lastname: Hummelen
authors.affiliation: School of Physics and Astronomy, Queen Mary University of London, Mile End Road, London, E1 4NS, UK. j.dennis@qmul.ac.uk.
authors.forename: T J S
authors.identifier: http://orcid.org/0000-0003-3543-7862
authors.initials: TJ
authors.lastname: Dennis