Photoinduced Intramolecular Charge Transfer and Hyperpolarizability Coefficient in Push-Pull Pyridinium Salts with Increasing Strength of the Acceptor Group.,ChemPlusChem

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Photoinduced Intramolecular Charge Transfer and Hyperpolarizability Coefficient in Push-Pull Pyridinium Salts with Increasing Strength of the Acceptor Group.
ChemPlusChem ( IF 3.0 ) Pub Date : 2018-10-18 , DOI: 10.1002/cplu.201800393
Alessio Cesaretti ₁ , Carmela Bonaccorso ₂ , Fausto Elisei ₁ , Cosimo G Fortuna ₂ , Letizia Mencaroni ₁ , Anna Spalletti ₁

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The synthesis of three push-pull cationic dyes is reported here together with a photophysical study carried out by stationary and ultrafast spectroscopies. The hyperpolarizability (β) values of the three molecules have been estimated through a simple solvatochromic method based on conventional, low-cost equipment, which had been tested previously with success in our laboratory. The investigated pyridinium salts showing strong negative solvatochromism bear the same piperidine ring as a strong electron-donor group and the same thiophenes as electron-rich π-linkers, but differ in terms of the N-substituent on the electron-acceptor pyridinium unit, namely N-methyl in compound A, N-pyrimidin-2yl in B and N-2,4-dinitrophenyl in C. The derived β values were found to increase (in the order A

中文翻译：

随着受体基团强度的增加，推挽式吡啶鎓盐中的光诱导分子内电荷转移和超极化系数。

此处报道了三种推挽阳离子染料的合成，以及通过固定和超快光谱学进行的光物理研究。这三种分子的超极化率（β）值是通过基于常规低成本设备的简单溶剂变色方法估算的，该方法先前已经在我们的实验室中成功进行了测试。所研究的吡啶鎓盐显示出很强的负溶剂变色性，与一个强电子给体基团具有相同的哌啶环，并且与富电子的π-连接基具有相同的噻吩，但在电子受体吡啶鎓单元上的N-取代基不同，即化合物A中的N-甲基，B中的N-嘧啶-2yl和C中的N-2,4-二硝基苯基。发现衍生的β值增加（顺序为A

更新日期：2018-10-18

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