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Excited-State Dipole and Quadrupole Moments: TD-DFTversus CC2

机译:激发态偶极和四极矩:TD-DFT与CC2

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摘要

The accuracies of the excited-state dipole and quadrupole moments obtained by TD-DFT are assessed by considering 16 different exchange-correlation functionals and more than 30 medium and large molecules. Except for excited-state presenting a significant charge-transfer character, a relatively limited dependency on the nature of the functional is found. It also turns out that while DFT ground-state dipole moments tend to be too large, the reverse trend is obtained for their excited-state counterparts, at least when hybrid functionals are used. Consequently, the TD-DFT excess dipole moments are often too small, an error that can be fortuitously corrected for charge-transfer transition by selecting a pure or a hybrid functional containing a small share of exact exchange. This error-cancelation phenomena explains the contradictory conclusions obtained in previous investigations. Overall, the largest correlation between CC2 and TD-DFT excess dipoles is obtained with M06-2X, but at the price of a nearly systematic underestimation of this property by ca. 1 D. For the excess quadrupole moments, the average errorsare of the order of 0.2–0.6 D·Å for the set of smallaromatic systems treated.
机译:TD-DFT获得的激发态偶极矩和四极矩的精度是通过考虑16种不同的交换相关功能和30多种中大分子来评估的。除了表现出显着的电荷转移特性的激发态外,还发现对功能性质的依赖相对有限。结果还表明,尽管DFT基态偶极矩趋于太大,但至少在使用混合功能时,其激发态对应物却获得了相反的趋势。因此,TD-DFT的过量偶极矩通常太小,可以通过选择包含少量精确交换的纯或杂合官能团来偶然纠正电荷转移转移的误差。这种消除错误的现象解释了先前研究中得出的矛盾结论。总体而言,使用M06-2X可获得CC2和TD-DFT多余偶极子之间的最大相关性,但此特性的价格却被系统地低估了约40%。 1 D.对于多余的四极矩,平均误差对于小的一组,大约为0.2–0.6 D·Å芳香体系处理。

著录项

  • 期刊名称 ACS AuthorChoice
  • 作者

    Denis Jacquemin; *;

  • 作者单位
  • 年(卷),期 -1(12),8
  • 年度 -1
  • 页码 3993–4003
  • 总页数 11
  • 原文格式 PDF
  • 正文语种
  • 中图分类
  • 关键词

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