Two-photon absorption properties of azulenyl compounds having a conjugated ketone backbone
Two-photon absorption properties of azulenyl compounds having a conjugated ketone backbone
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DOI：
10.1021/jp800415b
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发表时间：
2008-06-12
影响因子：
2.9
通讯作者：
Ohta, Koji
中科院分区：
文献类型：
--
作者：
Hirakawa, Shoichiro;Kawamata, Jun;Ohta, Koji
报道了新合成的共轭酮衍生物的双光子吸收（TPA）性质，该共轭酮衍生物包括偶联体系中α， α′-双（1- azulenlidene）环戊酮（1Az）、α， α′-双（2- azulenlidene）环戊酮（2Az）和α， α′-双（6- azulenlidene）环戊酮（6Az）。利用飞秒激光开孔z扫描法测量了这些氮烯基化合物的TPA光谱。发现1Az的峰位(sigma(（2))（峰））的TPA截面是三种azulenyl化合物中最大的，几乎是具有相同pi电子数的1Az的交替异构体α， α′-双（1-萘基）环戊酮（1Nph）的7倍。与1Nph相比，azulenyl化合物的失谐能小，这是TPA截面大的原因。我们报道了一种具有azulenyl部分的化合物可能是一种有前途的TPA材料。
Two-photon absorption (TPA) properties of newly synthesized conjugated ketone derivatives that include nonalternant azulenyl moieties in the pi-conjugation system, alpha,alpha'-bis(1-azulenylidene)cyclopentanone (1Az), alpha,alpha'-bis(2-azulenylidene)cyclopentanone (2Az), and alpha,alpha'-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 (sigma((2))(peak)) of 1Az was found to be the laraest among the three azulenyl compounds, which is almost 7 times larger than that of the alpha,alpha'-bis(1-naphthylidene)cyclopentanone (1Nph), an alternant isomer of 1Az with the same number of pi-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.