title: Pentacene-based dendrimers: synthesis and thin film photoconductivity measurements of branched pentacene oligomers.
abstract: The synthesis of pentacene-based dendrimers has been achieved via esterification of 1,3,5-benzenetricarboxylic acid and unsymmetrical pentacene 4 possessing a hydroxy group. Dendrimers 1 (C(183)H(204)O(9)Si(9), 2800 g mol(-1)) and 2 (C(540)H(570)O(30)Si(24), 8214 g mol(-1)) are characterized by (1)H and (13)C NMR, IR, UV-vis, and fluorescence spectroscopy, as well as mass spectrometry. These branched oligomeric materials are benchtop stable and soluble in common organic solvents, allowing for solution cast formation of thin films. Photocurrent and photocurrent yield measurements of these films reveal improved efficiency in photogenerated conduction for dendrimers in comparison to linearly connected pentacene-based polymers.
authors.affiliation: Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada.
authors.forename: Dan
authors.initials: D
authors.lastname: Lehnherr
authors.forename: Jianbo
authors.initials: J
authors.lastname: Gao
authors.forename: Frank A
authors.initials: FA
authors.lastname: Hegmann
authors.forename: Rik R
authors.initials: RR
authors.lastname: Tykwinski