# Excited Triplet Stateof Heptacene Studied by ElectronSpin Resonance

https://mdr.nims.go.jp/datasets/99710249-c512-4957-af44-42927c4209a5

## File

- [jacs.6c06021.pdf](https://mdr.nims.go.jp/filesets/1465fd4b-a5df-4c6b-b8df-438a15d74457/download) ([Detail](https://mdr.nims.go.jp/filesets/1465fd4b-a5df-4c6b-b8df-438a15d74457.md))

## Id

99710249-c512-4957-af44-42927c4209a5

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-10-06T06:22:18.198595Z

## Updated at

2026-10-06T07:03:50.221956Z

## Published at

2026-10-06T09:23:16.143752Z

## Doi



## First published url

https://doi.org/10.1021/jacs.6c06021

## Date published

2026-09-02

## Recorded date published

2026-9-2

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: |-
    Excited Triplet State
    of Heptacene Studied by Electron
    Spin Resonance
  title_type: original
  lang: en

## Description

- description: Excited triplet states of acene (3n A*, n being the number of benzene
    rings) have recently attracted considerable attention because of their useful
    applications. However, 3n A* with n > 5 have not been experimentally explored,
    due to the insolubility and instability of the higher acenes. In this study, we
    succeeded in detecting spin-polarized 37A* by combining the photoprecursor method
    using a degassed amorphous matrix of o-terphenyl and time-resolved electron spin
    resonance. 37A* is the longest acene among the 3n A* observed to date. It has
    been clarified that 37A* is generated by preferential intersystem crossing to
    the in-plane sublevels and possesses zero-field splitting constants of D = 0.035
    cm–1 and E = 0.000 cm–1. The D values for 3n A* (n = 2–7) were found to follow
    a linear 1/n-dependence, expressed as D(n)=0.180/n+0.011 [cm–1], which provides
    a quantitative basis for the spatial extent of excitation in even higher 3n A*
    states.
  description_type: abstract
  lang: und

## Creator

- name: Mikaru Masuda
  role: author
- name: Joel Hao Jorolan
  role: author
- name: Hironobu Hayashi
  role: author
  orcid: https://orcid.org/0000-0002-7872-3052
- name: Hiroko Yamada
  role: author
  orcid: https://orcid.org/0000-0002-2138-5902
- name: Tomoaki Miura
  role: author
  orcid: https://orcid.org/0000-0002-7281-3049
- name: Tadaaki Ikoma
  role: author
  orcid: https://orcid.org/0000-0003-2003-6839

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: Acene
  schema: not_defined
- subject: Magnetic property
  schema: not_defined
- subject: Electron Spin Resonance
  schema: not_defined
- subject: Excited state
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: |-
    Journal of the American
    Chemical Society
  issn: '00027863'
  volume: '148'
  issue: '34'
  start_page: 36309
  end_page: 36313

## Conference



## Related item



## Funding

- identifier: 23K17901
  funder_name: JSPS Kakenhi
- identifier: NA
  funder_name: SPRING
- identifier: NA
  funder_name: Union Tool and TAKEUCHI Scholarship Associations
- identifier: PM2121
  funder_name: JST SPRNG

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: 1465fd4b-a5df-4c6b-b8df-438a15d74457
  filename: jacs.6c06021.pdf
  content_type: application/pdf
  size: 2361591
  md5: 4197f8f0d862f24b5389c9918fd67562

## Thumbnail

fileset_id: 1465fd4b-a5df-4c6b-b8df-438a15d74457
filename: jacs.6c06021.pdf