Pentacene-Based Dendrimers: Synthesis and Thin Film Photoconductivity Measurements of Branched Pentacene Oligomers

摘要

The synthesis of pentacene-based dendrimers has been achieved via esterification of 1,3,5-benzenetri_carboxylic acid and unsymmetrical pentacene 4 possessing a hydroxy group. Dendrimers 1 (C_(183)H_(204)O_9Si_9, 2800 g mol~(-1)) and 2 (C_(540)H_(570)O_(30)Si_(24), 8214 g mol~(-1)) are characterized by ~1H 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.