title: High-Yield Excited Triplet States in Pentacene Self-Assembled Monolayers on Gold Nanoparticles through Singlet Exciton Fission.
abstract: One of the major drawbacks of organic-dye-modified self-assembled monolayers on metal nanoparticles when employed for efficient use of light energy is the fact that singlet excited states on dye molecules can be easily deactivated by means of energy transfer to the metal surface. In this study, a series of 6,13-bis(triisopropylsilylethynyl)pentacene-alkanethiolate monolayer protected gold nanoparticles with different particle sizes and alkane chain lengths were successfully synthesized and were employed for the efficient generation of excited triplet states of the pentacene derivatives by singlet fission. Time-resolved transient absorption measurements revealed the formation of excited triplet states in high yield (172±26 %) by suppressing energy transfer to the gold surface.
authors.affiliation: Department of Chemistry, Faculty of Science and Technology, Keio University, Yokohama, Kanagawa, 223-8522, Japan.
authors.forename: Daiki
authors.initials: D
authors.lastname: Kato
authors.affiliation: Department of Chemistry, Faculty of Science and Technology, Keio University, Yokohama, Kanagawa, 223-8522, Japan.
authors.forename: Hayato
authors.initials: H
authors.lastname: Sakai
authors.affiliation: Department of Chemistry and Bioengineering, Tampere University of Technology, P.O. Box 541, 33101, Tampere, Finland. nikolai.tkachenko@tut.fi.
authors.forename: Nikolai V
authors.initials: NV
authors.lastname: Tkachenko
authors.affiliation: Department of Chemistry, Faculty of Science and Technology, Keio University, Yokohama, Kanagawa, 223-8522, Japan. hasobe@chem.keio.ac.jp.
authors.forename: Taku
authors.initials: T
authors.lastname: Hasobe
keywords: gold; nanoparticles; pentacene; self-assembled monolayers; singlet fission