选择氮杂芴(咔唑)为π-中心,分别以三苯胺和噁二唑取代基为"枝",合成了两个强双光子吸收的氮杂芴衍生物-2,8-双(4-三苯胺乙烯基)-N-乙基氮杂芴(简称NT-G1)和2,8-双(2-(4'-乙氧基)-5-(4'-苯乙烯)-1,3,4- 噁二唑)-N-基氮杂芴(简称NO-G1),进行了核磁共振谱和质谱等表征.飞秒钛宝石激光器泵浦下,NT-G1和NO-G1溶液发出强双光子上转换荧光,且后者的双光子荧光发射截面是前者的7倍;双光子荧光法计算出NT-G1和NO-G1双光子吸收截面分别为215GM和454GM.分子构型优化表明,NT-G1分子中心"氮杂芴"所在平面与两端苯环呈螺旋桨式排布;而NO-G1分子共轭长度增大,且中心的"氮杂芴"与两端延伸的"枝"呈平面构型;从结构上看,NO-G1分子属"D-A-π-A-D"型,具有明显的pn结模式,这些都使NO-G1分子具有更好的分子内电荷转移能力,因而有较高的双光子吸收截面.
参考文献
[1] | G(o)pper-Mayer M .[J].Ann Phys(Lpz),1931,9:273. |
[2] | Bhawalkar JD.;Prasad PN.;He GS. .NONLINEAR MULTIPHOTON PROCESSES IN ORGANIC AND POLYMERIC MATERIALS [Review][J].Reports on Progress in Physics,1996(9):1041-1070. |
[3] | Spangler C W .[J].Journal of Materials Chemistry,1999,9:2013-2020. |
[4] | Cumpston B H;Ananthavel S P;Barlow S et al.[J].Nature,1999,3:104. |
[5] | He GS;Markowicz PP;Lin TC;Prasad PN .Observation of stimulated emission by direct three-photon excitation[J].Nature,2002(6873):767-770. |
[6] | He G S;Bhawwalkar J D et al.[J].Applied Physics Letters,1995,67:3703. |
[7] | Albota M;Beljionne D;Bras J L et al.[J].Science,1998,281:1653. |
[8] | Kotlera Z;Segala J;Sigalovb M et al.[J].Synthetic Metals,2000,115:269. |
[9] | Tao XT;Zhang YD;Wada T;Sasabe H;Suzuki H;Watanabe T;Miyata S; .Novel main-chain poly-carbazoles as hole and electron transport materials in polymer light-emitting diodes[J].Applied physics letters,1997(14):1921-1923. |
[10] | Jen A K Y;Rao V P;Wong K Y.[J].Journal of the Chemical Society,Chemical Communications,1993(01):90-92. |
[11] | Wang X M;Zhou Y F;Zhou GY et al.[J].Bulletin of the Chemical Society of Japan,2002,8:1847. |
[12] | Guo X Z;Wang X M;Du Y K.[J].Chinese Chemical Letters |
[13] | Xu C;Webb W W et al.[J].Journal of Optics B:Quantum and Semiclassical Optics,1996,13:481. |
[14] | Tedjamulia M L;Tominaga Y;Castle R N et al.[J].Journal of Heterocyclic Chemistry,1983,20:481. |
[15] | Beljonne D;Bredas J L;Cha M et al.[J].Journal of Physical Chemistry,1995,103:7834. |
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