Effects of Pressure and Shear Stress on the Absorption Spectra of Thin Films of Pentacene

Shirotani, Ichimin; Hoshino, Junichi; Takeda, Keiki; Kawamura, Haruki; Inokuchi, Makoto; Yakushi, Kyuya; Inokuchi, Hiroo

doi:10.1080/15421400600914890

Cited by 4 publications

(1 citation statement)

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“…Though the bathochromic shift in absorption spectra of electronic transition with increasing pressure has been observed in some organic crystals, polymers, and metal complexes, − the continuously shifting and broadening of spectra covering nearly the entire visible region (from ∼430 to ∼700 nm) for OX-1 are still unusual. For common polymers or some conjugated organic molecules, pressure-induced better planarity and strengthened overlap of π-electrons by shortening intermolecular distance are responsible for the bathochromic shift in the absorption (around 100 nm). − For OX-1 , besides the better planarity and enhanced intermolecular interactions, we think that the molecular structural transformation contributes more to the large-scale spectra bathochromic shift. To confirm this assumption, we investigated another single crystal of IA-1 , which has an analogous conjugated structure with zwitterionic OX-1 but lacks structural adjustability (Figure and Supporting Information Figure S19a).…”

Section: Resultsmentioning

confidence: 95%

Dynamic Behavior of Molecular Switches in Crystal under Pressure and Its Reflection on Tactile Sensing

et al. 2015

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Molecular switches have attracted increasing interest in the past decades, due to their broad applications in data storage, optical gating, smart windows, and so on. However, up till now, most of the molecular switches are operated in solutions or polymer blends with the stimuli of light, heat, and electric fields. Herein, we demonstrate the first pressure-controllable molecular switch of a benzo[1,3]oxazine OX-1 in crystal. Distinct from the light-triggered tautomerization between two optical states, applying hydrostatic pressure on the OX-1 crystal results in large-scale and continuous states across the whole visible light range (from ∼430 to ∼700 nm), which has not been achieved with other stimuli. Based on detailed and systematic control experiments and theoretical calculation, the preliminary requirements and mechanism of pressure-dependent tautomerization are fully discussed. The contributions of molecular tautomerization to the large-scale optical modulation are also stressed. Finally, the importance of studying pressure-responsive materials on understanding tactile sensing is also discussed and a possible mechanotransduction mode is proposed.

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Section: Resultsmentioning

confidence: 95%

Dynamic Behavior of Molecular Switches in Crystal under Pressure and Its Reflection on Tactile Sensing

et al. 2015

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A review on high-pressure torsion (HPT) from 1935 to 1988

Edalati

Horita

2016

Materials Science and Engineering: A

494

269

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Red-Shifted Photochromism of Diarylethenes Induced by Shear Stress

Inoue¹,

Inokuchi²

2016

Bulletin of the Chemical Society of Japan

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The solid-state photochromism of two diarylethenes, 1,2-bis(2,4-dimethyl-5-phenyl-3-thienyl)perfluorocyclopentene (1a) and 1,2-bis(2-methylbenzothiophen-3-yl)perfluorocyclopentene (2a), under shear stress has been investigated. It was found that 1a and 2a exhibited photochromic behavior, transforming from their open-ring isomers to closed-ring isomers during irradiation with visible light while under shear stress. This phenomenon was similar to that observed for cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene (CMTE). These phenomena in 1a, 2a, and CMTE are intriguing because, ordinarily, photochromism in diarylethenes requires irradiation with ultraviolet (UV) light. The application of shear stress allowed non-photochromic crystal 2a to undergo photochromism. Visible absorption spectra for the three diarylethenes indicated that shear stress induced a red shift in the absorption, spanning from the UV region to the visible region. As a result, the diarylethenes in the solid state were able to absorb visible light around 400 nm for 1a and 2a, and 500 nm for CMTE, with photochromism confirmed by the appearance of a new absorption. Herein, we explore the comparative effects of shear stress and hydrostatic pressure.

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Effects of Pressure and Shear Stress on the Absorption Spectra of Thin Films of Pentacene

Cited by 4 publications

References 20 publications

Dynamic Behavior of Molecular Switches in Crystal under Pressure and Its Reflection on Tactile Sensing

Dynamic Behavior of Molecular Switches in Crystal under Pressure and Its Reflection on Tactile Sensing

A review on high-pressure torsion (HPT) from 1935 to 1988

Red-Shifted Photochromism of Diarylethenes Induced by Shear Stress

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