Laser induced emission spectra of polyyne molecules C2nH2 (n=5–8)

Wakabayashi, Tomonari; Nagayama, Hiroyuki; Daigoku, Kota; Kiyooka, Yosuke; Hashimoto, Kenro

doi:10.1016/j.cplett.2007.08.057

Cited by 26 publications

(35 citation statements)

References 16 publications

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“…13). We mention supersonic cluster beam deposition (such as the pulsed microplasma cluster source -PMCS developed by P. Milani and coworkers), 94 laser vaporization methods, 95,96 and femtosecond laser ablation of graphite. 97 These techniques typically produce solid samples in the form of thin films on substrates.…”

Section: Synthesis and Preparation Of Sp-carbon Systems: A Brief Overmentioning

confidence: 99%

Carbon-atom wires: 1-D systems with tunable properties

et al. 2016

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This review provides a discussion of the current state of research on linear carbon structures and related materials based on sp-hybridization of carbon atoms ( polyynes and cumulenes). We show that such systems have widely tunable properties and thus represent an intriguing and mostly unexplored field for both fundamental and applied sciences. We discuss the rich interplay between the structural, vibrational, and electronic properties focusing on recent advances and the future perspectives of carbon-atom wires and novel hybrid sp-sp 2 -carbon architectures.

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Section: Synthesis and Preparation Of Sp-carbon Systems: A Brief Overmentioning

confidence: 99%

Carbon-atom wires: 1-D systems with tunable properties

et al. 2016

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“…The absorption maximum is at 245.6 nm for the former and at 264.4 nm for the latter. In addition to the vibrational progression of a stretching mode toward shorter wavelengths, which is similar to the spectra of hydrogen-capped polyynes, H(C≡C) n H [16,[18][19][20]28], shoulders and weaker bands are discernible in the longer wavelength region [17].…”

Section: A Uv Ir and Raman Spectra In Solutionsmentioning

confidence: 61%

“…Preparation and characterization of laser ablated polyyne molecules are described elsewhere [16][17][18][19][20]. Briefly, cyanopolyyne molecules are formed by laser ablation (Continuum Powerlite 8010, 1064 nm, 0.5 J/pulse, 10 Hz) of graphite particles suspended in acetonitrile (Nacalai Guaranteed Reagent, Acetonitrile, ≥99.5 % CH 3 CN) and separated in size by high performance liquid chromatography (HPLC) [17].…”

Section: Sample Preparation and Uv Absorption Spectroscopymentioning

confidence: 99%

“…Methylcyanopolyynes are also target molecules for spectroscopy [13][14][15]. Laser ablation of carbon particles in liquid acetonitrile has opened a way for production of longer polyynes and cyanopolyynes in a milligram order to handle them in organic solvents under ambient temperature [16][17][18][19][20]. Further stabilization is acquired for hydrogen-capped polyyne molecules trapped in solid host environments such as single wall carbon nanotubes (SWNTs) [21][22][23] and polyvinyl alcohol (PVA) [24].…”

Section: Introductionmentioning

confidence: 99%

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Phosphorescence excitation mapping and vibrational spectroscopy of HC9N and HC11N cyanopolyynes in organic solvents

Szczepaniak

Kazunori

Tanaka

et al. 2020

Journal of Molecular Structure

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Cyanopolyyne molecules, HC 9 N and HC 11 N, were isolated in solutions and UV, IR, and resonance Raman spectra were measured for the study of their electronic and vibrational properties. Strong signals were observed both in the IR and resonance Raman spectra for the stretching vibrational mode of the sp-hybridized linear carbon chain in the electronic ground state, i.e., σ 4 at 2141 cm -1 for HC 9 N and σ 6 at 2105 cm -1 for HC 11 N.Trapped in cryogenic solid acetonitrile matrix hosts at 20 K, transitions in phosphorescence, 3 Σ + → 1 Σ + , were observed for HC 9 N at 582.3 nm (0-0) and longer wavelengths and for HC 11 N at 643.7 nm (0-0) and longer wavelengths. Electronic transitions in the UV, 1 Σ + ← 1 Σ + , were elucidated by phosphorescence excitation mapping to observe asymmetric patterns with sharp emission-absorption features explainable by Shpolsky effects. For HC 9 N, three distinct trapping sites were discernible in solid acetonitrile, while the phosphorescence spectra were blurred in solid n-hexane. The observed phosphorescence lifetime of HC 9 N was longer than that of HighlightsPhosphorescence of cyanopolyyne molecules of HC 9 N and HC 11 N at 20 K Resonance Raman spectroscopy and IR spectra of HC 9 N and HC 11 N Solid acetonitrile or n-hexane matrix hosts provides multiple trapping sites

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“…Taking the C 10 H 2 as an example, the dipole-forbidden transitions are estimated between 2.2 and 3.2 eV while the dipole-allowed state is around 5.2 eV. 12,18 In a previous work, we presented a resonance Raman study of C 10 H 2 and C 12 H 2 polyynes trapped inside single-wall carbon nanotubes (SWNTs) of different diameters, using several different laser energies in the visible range. 13 The intensity of the stretching modes of the polyynes exhibits a resonance behavior in the visible range that is explained in terms of a symmetry breaking that induces the observation of dipole-forbidden transitions, also named "dark states."…”

Section: Introductionmentioning

confidence: 99%

Dielectric screening in polyynes encapsulated inside double-wall carbon nanotubes

et al. 2011

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A resonance Raman study of the polyyne molecule C 10 H 2 encapsulated inside double-wall carbon nanotubes (C 10 H 2 @DWNT), excited with many different laser energies between 1.92 and 2.71 eV, is presented. A resonant enhancement of the Raman peaks of the polyynes was observed and the intensity versus laser energy profile was fitted by two Voigt curves associated with resonances with the incident and scattered photons. The charge transfer between the molecule and the nanotubes was evidenced by the shift in the nanotube Raman G band. The comparison of the optical energies of the polyynes encapsulated inside single-and double-wall carbon nanotubes reveals that the screening effect on the polyynes is mainly due to the inner tube of the double-wall carbon nanotubes.

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Laser induced emission spectra of polyyne molecules C2nH2 (n=5–8)

Cited by 26 publications

References 16 publications

Carbon-atom wires: 1-D systems with tunable properties

Carbon-atom wires: 1-D systems with tunable properties

Phosphorescence excitation mapping and vibrational spectroscopy of HC9N and HC11N cyanopolyynes in organic solvents

Dielectric screening in polyynes encapsulated inside double-wall carbon nanotubes

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