Dihydro-1H-Pyrazoles as Donor Blocks in Donor–Acceptor Chromophores for Electro-Optics: A DFT Study of Hyperpolaizability and Electronic Excitations

IF 2.3 3区 化学 Q3 CHEMISTRY, PHYSICAL International Journal of Quantum Chemistry Pub Date : 2024-11-04 DOI:10.1002/qua.27511
Roman Ishchenko, Vladimir Shelkovnikov
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Abstract

A diverse set of promising donors for donor–acceptor chromophores based on dihydro-1H-pyrazole (pyrazoline) for use in electro-optics was investigated using DFT at M06-2X/aug-cc-pVDZ level of theory. These calculations showed that it is possible to achieve a molecular hyperpolarizability of up to 1700*10−30 esu (up to three times higher compared to conventional diethylaniline donors) for a simple tricyanofuran-based acceptor by carefully tuning the donor structure. It was shown that the molecular hyperpolarizability is mainly affected by the substituents in the aryl rings in positions 3 and 1 of the pyrazoline cycle, while the substituents of the aryl ring in position 5 and the pyrazoline ring itself can be varied without significant effects on the hyperpolarizability. For one of the compounds, a detailed study of the lowest energy electronic excitation was performed using the TD-DFT, confirming the role of the pyrazoline ring as a secondary donor.

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二氢-1H-吡唑作为用于电光学的供体-受体色团中的供体嵌段:超光化性和电子激发的 DFT 研究
在 M06-2X/aug-cc-pVDZ 理论水平上,使用 DFT 研究了基于二氢-1H-吡唑(吡唑啉)的多种有前途的供体-受体发色团,这些供体可用于电光学。计算结果表明,通过仔细调整供体结构,可以使简单的三氰基呋喃受体的分子超极化率达到 1700*10-30 esu(比传统的二乙基苯胺供体高出三倍)。研究表明,分子超极化率主要受吡唑啉循环中第 3 位和第 1 位芳基环上取代基的影响,而第 5 位芳基环和吡唑啉环本身的取代基可以改变,但不会对超极化率产生显著影响。利用 TD-DFT 对其中一种化合物的最低能量电子激发进行了详细研究,证实了吡唑啉环作为次级供体的作用。
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来源期刊
International Journal of Quantum Chemistry
International Journal of Quantum Chemistry 化学-数学跨学科应用
CiteScore
4.70
自引率
4.50%
发文量
185
审稿时长
2 months
期刊介绍: Since its first formulation quantum chemistry has provided the conceptual and terminological framework necessary to understand atoms, molecules and the condensed matter. Over the past decades synergistic advances in the methodological developments, software and hardware have transformed quantum chemistry in a truly interdisciplinary science that has expanded beyond its traditional core of molecular sciences to fields as diverse as chemistry and catalysis, biophysics, nanotechnology and material science.
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