Synthesis of hydrogen- and methyl-capped long-chain polyynes by intense ultrashort laser pulse irradiation of toluene

Hydrogen- and methyl-capped polyynes have been synthesized by irradiating pure liquid toluene with 35 fs, 300 μJ laser pulses having a central wavelength of 800 nm, generated by a regeneratively amplified Ti:sapphire tabletop laser at a repetition rate of 1 kHz. Raman spectroscopy was used to confir...

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Bibliographic Details
Published inCarbon (New York) Vol. 118; pp. 680 - 685
Main Authors Ramadhan, Ali, Wesolowski, Michal, Wakabayashi, Tomonari, Shiromaru, Haruo, Fujino, Tatsuya, Kodama, Takeshi, Duley, Walter, Sanderson, Joseph
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 01.07.2017
Elsevier BV
Subjects
Amplification
Capping
Chains
High performance liquid chromatography
Hydrogen
Irradiation
Laser applications
Lasers
Liquid chromatography
Raman spectroscopy
Repetition
Sapphire
Synthesis
Toluene
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Summary:Hydrogen- and methyl-capped polyynes have been synthesized by irradiating pure liquid toluene with 35 fs, 300 μJ laser pulses having a central wavelength of 800 nm, generated by a regeneratively amplified Ti:sapphire tabletop laser at a repetition rate of 1 kHz. Raman spectroscopy was used to confirm the presence of polyynes in the irradiated samples while high-performance liquid chromatography was used to separate hydrogen-capped polyynes up to C18H2 and methyl-capped polyynes up to HC14CH3. These represent the first such methyl-capped polyynes and the longest hydrogen capped chains synthesized to date by the ultrafast laser based method. Furthermore our results show that choice of the starting solvent molecule directly influences the end caps of the polyynes which can be produced. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2017.03.096