Departamento de Química Orgánica, ICMA, Universidad de Zaragoza-CSIC, 50009, Zaragoza, Spain.
Chemphyschem. 2012 Sep 17;13(13):3204-9. doi: 10.1002/cphc.201200203. Epub 2012 Jun 15.
Multichromophoric calix[4]arenes with two or four disperse red one (DR1) moieties linked to the lower rim have been synthesized. The second-order nonlinear optical activity was measured by using the electric-field-induced second-harmonic generation technique and there was a nearly linear increase of the μβ value with the number of chromophores in the molecule without affecting the charge-transfer absorption wavelength. The effect that the number of DR1 units plays on the hyperpolarizability, the dipole moment, and the absorption maxima has been also studied by using quantum chemical calculations. It was found that it was necessary to synthesize multichromophores with distant chromophores to obtain large nonlinear optical responses.
合成了具有两个或四个分散红一（DR1）部分连接到底部边缘的多生色杯[4]芳烃。通过电场诱导二次谐波产生技术测量了二阶非线性光学活性，并且μβ值随着分子中生色团的数量几乎呈线性增加，而不影响电荷转移吸收波长。通过量子化学计算还研究了 DR1 单元数量对超极化率、偶极矩和吸收最大值的影响。结果发现，有必要合成具有远距离生色团的多生色团以获得大的非线性光学响应。
