Two-Photon Absorption Properties of Azulenyl Compounds Having a Conjugated Ketone Backbone

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• 作者：Shoichiro Hirakawa ; Jun Kawamata ; Yasutaka Suzuki ; Seiji Tani ; Toshihiro Murafuji ; Kazuo Kasatani ; Liudmil Antonov ; Kenji Kamada ; Koji Ohta
• 刊名：Journal of Physical Chemistry A
• 出版年：2008
• 出版时间：June 12, 2008
• 年：2008
• 卷：112
• 期：23
• 页码：5198 - 5207
• 全文大小：981K
• 年卷期：v.112,no.23(June 12, 2008)
• ISSN：1520-5215

文摘

Two-photon absorption (TPA) properties of newly synthesized conjugated ketone derivatives that include nonalternant azulenyl moieties in the π-conjugation system, α,α′-bis(1-azulenylidene)cyclopentanone (1Az), α,α′-bis(2-azulenylidene)cyclopentanone (2Az), and α,α′-bis(6-azulenylidene)cyclopentanone (6Az) are reported. TPA spectra of these azulenyl compounds were measured using the open-aperture Z-scan method with a femtosecond laser. The TPA cross section at the peak position (σ⁽²⁾_peak) of 1Az was found to be the largest among the three azulenyl compounds, which is almost 7 times larger than that of the α,α′-bis(1-naphthylidene)cyclopentanone (1Nph), an alternant isomer of 1Az with the same number of π-electrons. The small detuning energies of the azulenyl compounds compared to those of 1Nph were responsible for the large TPA cross sections. We report that a compound having an azulenyl moiety can be a promising TPA material.