Multiexciton Dynamics Depending on Intramolecular Orientations in Pentacene Dimers: Recombination and Dissociation of Correlated Triplet Pairs

Hayato Sakai, Ryutaro Inaya, Hiroki Nagashima, Shunta Nakamura, Yasuhiro Kobori, Nikolai V. Tkachenko, Taku Hasobe

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Pentacene dimers bridged by a phenylene at ortho and meta positions [denoted as o-(Pc)2 and m-(Pc)2] were synthesized to examine intramolecular orientation-dependent multiexciton dynamics, especially focusing on the singlet fission (SF) and recombination from correlated triplet pairs (TT). Absorption and electrochemical measurements indicated strong intramolecular couplings of o-(Pc)2 relative to m-(Pc)2. Femtosecond and nanosecond transient absorption measurements successfully demonstrated the efficient SF in both dimers. In contrast, the dissociation process from the (TT) to the individual triplets [(2 × T)] was clearly observed in m-(Pc)2, which is in sharp contrast to a major recombination process in o-(Pc)2. Time-resolved electron spin resonance (TR-ESR) measurements demonstrated that the recombination and the dissociation proceed from quintet state of 5(TT) in m-(Pc)2. Rate constant of the SF was two orders of magnitude greater in o-(Pc)2 than that in m-(Pc)2 and were rationalized by enhanced electronic coupling between adjacent HOMOs of the Pc units.

Original languageEnglish
JournalJournal of Physical Chemistry Letters
DOIs
Publication statusAccepted/In press - 2018 Apr 16

Fingerprint

Dimers
fission
dimers
dissociation
Paramagnetic resonance
Rate constants
electron paramagnetic resonance
electronics
pentacene

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Multiexciton Dynamics Depending on Intramolecular Orientations in Pentacene Dimers : Recombination and Dissociation of Correlated Triplet Pairs. / Sakai, Hayato; Inaya, Ryutaro; Nagashima, Hiroki; Nakamura, Shunta; Kobori, Yasuhiro; Tkachenko, Nikolai V.; Hasobe, Taku.

In: Journal of Physical Chemistry Letters, 16.04.2018.

Research output: Contribution to journalArticle

@article{b2aadaaab10a498ca333b93547601ced,
title = "Multiexciton Dynamics Depending on Intramolecular Orientations in Pentacene Dimers: Recombination and Dissociation of Correlated Triplet Pairs",
abstract = "Pentacene dimers bridged by a phenylene at ortho and meta positions [denoted as o-(Pc)2 and m-(Pc)2] were synthesized to examine intramolecular orientation-dependent multiexciton dynamics, especially focusing on the singlet fission (SF) and recombination from correlated triplet pairs (TT). Absorption and electrochemical measurements indicated strong intramolecular couplings of o-(Pc)2 relative to m-(Pc)2. Femtosecond and nanosecond transient absorption measurements successfully demonstrated the efficient SF in both dimers. In contrast, the dissociation process from the (TT) to the individual triplets [(2 × T)] was clearly observed in m-(Pc)2, which is in sharp contrast to a major recombination process in o-(Pc)2. Time-resolved electron spin resonance (TR-ESR) measurements demonstrated that the recombination and the dissociation proceed from quintet state of 5(TT) in m-(Pc)2. Rate constant of the SF was two orders of magnitude greater in o-(Pc)2 than that in m-(Pc)2 and were rationalized by enhanced electronic coupling between adjacent HOMOs of the Pc units.",
author = "Hayato Sakai and Ryutaro Inaya and Hiroki Nagashima and Shunta Nakamura and Yasuhiro Kobori and Tkachenko, {Nikolai V.} and Taku Hasobe",
year = "2018",
month = "4",
day = "16",
doi = "10.1021/acs.jpclett.8b01184",
language = "English",
journal = "Journal of Physical Chemistry Letters",
issn = "1948-7185",
publisher = "American Chemical Society",

}

TY - JOUR

T1 - Multiexciton Dynamics Depending on Intramolecular Orientations in Pentacene Dimers

T2 - Recombination and Dissociation of Correlated Triplet Pairs

AU - Sakai, Hayato

AU - Inaya, Ryutaro

AU - Nagashima, Hiroki

AU - Nakamura, Shunta

AU - Kobori, Yasuhiro

AU - Tkachenko, Nikolai V.

AU - Hasobe, Taku

PY - 2018/4/16

Y1 - 2018/4/16

N2 - Pentacene dimers bridged by a phenylene at ortho and meta positions [denoted as o-(Pc)2 and m-(Pc)2] were synthesized to examine intramolecular orientation-dependent multiexciton dynamics, especially focusing on the singlet fission (SF) and recombination from correlated triplet pairs (TT). Absorption and electrochemical measurements indicated strong intramolecular couplings of o-(Pc)2 relative to m-(Pc)2. Femtosecond and nanosecond transient absorption measurements successfully demonstrated the efficient SF in both dimers. In contrast, the dissociation process from the (TT) to the individual triplets [(2 × T)] was clearly observed in m-(Pc)2, which is in sharp contrast to a major recombination process in o-(Pc)2. Time-resolved electron spin resonance (TR-ESR) measurements demonstrated that the recombination and the dissociation proceed from quintet state of 5(TT) in m-(Pc)2. Rate constant of the SF was two orders of magnitude greater in o-(Pc)2 than that in m-(Pc)2 and were rationalized by enhanced electronic coupling between adjacent HOMOs of the Pc units.

AB - Pentacene dimers bridged by a phenylene at ortho and meta positions [denoted as o-(Pc)2 and m-(Pc)2] were synthesized to examine intramolecular orientation-dependent multiexciton dynamics, especially focusing on the singlet fission (SF) and recombination from correlated triplet pairs (TT). Absorption and electrochemical measurements indicated strong intramolecular couplings of o-(Pc)2 relative to m-(Pc)2. Femtosecond and nanosecond transient absorption measurements successfully demonstrated the efficient SF in both dimers. In contrast, the dissociation process from the (TT) to the individual triplets [(2 × T)] was clearly observed in m-(Pc)2, which is in sharp contrast to a major recombination process in o-(Pc)2. Time-resolved electron spin resonance (TR-ESR) measurements demonstrated that the recombination and the dissociation proceed from quintet state of 5(TT) in m-(Pc)2. Rate constant of the SF was two orders of magnitude greater in o-(Pc)2 than that in m-(Pc)2 and were rationalized by enhanced electronic coupling between adjacent HOMOs of the Pc units.

UR - http://www.scopus.com/inward/record.url?scp=85048051622&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85048051622&partnerID=8YFLogxK

U2 - 10.1021/acs.jpclett.8b01184

DO - 10.1021/acs.jpclett.8b01184

M3 - Article

AN - SCOPUS:85048051622

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

SN - 1948-7185

ER -