Raman spectral features of longer polyynes HC2 nH ( ${\sf n=4}$ –8) in SWNTs

Wakabayashi, Tomonari; Murakami, Toshiya; Nagayama, Hiroyuki; Nishide, Daisuke; Kataura, Hiromichi; Achiba, Yohji; Tochihara, Hiroshi; Hayashi, Shinji; Shinohara, Hisanori

doi:10.1140/epjd/e2009-00008-x

Cited by 21 publications

(16 citation statements)

References 17 publications

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“…As a consequence, it is likely that the interaction between the dinaphthylpolyynes and the solvent (attenuating the motion of the chain termination) induces the observed softening of the IR active modes much more than the R-α mode, which are localized near the chain center. Similar effects have been observed by many authors also for other systems both in solution and in the solid state [37][38][39][40][41]. Although the solvent-induced shift need not be uniform for dinaphthylpolyyne of different lengths, and also considering the frequent tendency of LDA to overestimate the vibrational frequencies [42][43][44], the overall agreement between the shifted simulated spectrum in Figure 6b and the experimental one in Figure 6a is good.…”

Section: Infrared-active Modessupporting

confidence: 87%

Vibrational characterization of dinaphthylpolyynes: A model system for the study of end-capped sp carbon chains

Cinquanta

Ravagnan

Castelli

et al. 2011

The Journal of Chemical Physics

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We perform a systematic investigation of the resonance and vibrational properties of naphthyl-terminated sp carbon chains (dinaphthylpolyynes) by combined multi-wavelength resonant Raman (MWRR) spectroscopy, ultraviolet-visible spectroscopy, and Fourier-transform infrared (FT-IR) spectroscopy, plus ab initio density functional theory (DFT) calculations. We show that the MWWR and FT-IR spectroscopies are particularly suited to identify chains of different lengths and different terminations, respectively. By DFT calculations, we further extend those findings to sp carbon chains end-capped by other organic structures. The present analysis shows that combined MWRR and FT-IR provide a powerful tool to draw a complete picture of chemically stabilized sp carbon chains.

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Section: Infrared-active Modessupporting

confidence: 87%

Vibrational characterization of dinaphthylpolyynes: A model system for the study of end-capped sp carbon chains

Cinquanta

Ravagnan

Castelli

et al. 2011

The Journal of Chemical Physics

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“…In bulk measurements, LCC can be detected by Raman spectroscopy, as they exhibit a Raman active mode in the range between 1790 and 2200 cm −1 . The frequency of the observed Raman shift of the mode assigned to the carbon chains (LCC-Band) is strongly correlated to the chain length, [ 19,20,[22][23][24][25][26] with longer chains giving smaller shifts. Consequently, when investigating on a bulk sample with different chain lengths, the transformation of the convoluted LCC signal line shape can be explained by different chain length distributions between the samples, meaning that a higher intensity on the low frequency side indicates a higher abundance of longer carbon chains and vice versa.…”

Section: Characterization Of Lccs@dwcnts Grown At Different Temperatumentioning

confidence: 99%

Selective Enhancement of Inner Tube Photoluminescence in Filled Double‐Walled Carbon Nanotubes

Rohringer

Shi

Ayala

et al. 2016

Adv Funct Materials

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A highly selective enhancement of the optical response of the inner tubes of double‐walled carbon nanotubes has been identified upon transformation of the residual C atoms inside the hollow core to linear carbon chains (LCC). By varying the growth conditions and using standardized suspensions, it has been observed that this optical response depends sensitively on the tube diameter and LCC growth yield. It is reported how the formation of LCC by postsynthesis annealing at 1400 °C leads to an increase of the photoluminescence (PL) signal of the inner tubes up to a factor of 6 for tubes with (8,3) chirality. This behavior can be attributed to a local charge transfer from the inner tubes to the carbon chains, counterbalancing quenching mechanisms induced by the outer tubes. These findings provide a viable pathway to enhance the low PL quantum yield of double‐walled carbon nanotubes and proof the capability of inner tubes to exhibit photoluminescence.

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“…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%

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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Raman spectral features of longer polyynes HC2 nH ( ${\sf n=4}$ –8) in SWNTs

Cited by 21 publications

References 17 publications

Vibrational characterization of dinaphthylpolyynes: A model system for the study of end-capped sp carbon chains

Vibrational characterization of dinaphthylpolyynes: A model system for the study of end-capped sp carbon chains

Selective Enhancement of Inner Tube Photoluminescence in Filled Double‐Walled Carbon Nanotubes

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

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