Optical rotation calculations on large molecules using the approximate coupled cluster model CC2 and the resolution-of-the-identity approximation.

Optical rotation calculations on large molecules using the approximate coupled cluster model CC2 and the resolution-of-the-identity approximation.
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使用近似耦合簇模型 CC2 和身份分辨率近似计算大分子的旋光度

DOI:
10.1039/c3cp54338b
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发表时间:
2014
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
Christof Hättig
Christof Hättig
中科院分区:
--
文献类型:
--
作者:
Daniel H. Friese;Christof Hättig

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我们研究了近似耦合团簇单双模型CC 2在预测有机分子旋光度中的性能。为了这个目的,我们采用了两个测试集的组合,其中包括小型和中型的刚性有机分子和一系列的螺旋。CC 2计算分子大到11-helicene成为可能,通过最近实施的频率依赖性的二阶性能CC 2,它利用的分辨率的身份近似的电子排斥积分。相对于旋光度的绝对值的准确性和正确的符号,这是至关重要的绝对配置的确定的预测的结果进行评估。在B3 LYP和CAM-B3 LYP水平上比较了CC 2和密度泛函理论的性能。此外,我们研究了分子几何形状和单电子基组的影响,并测试了自旋分量标度在多大程度上改变了结果。
We investigate the performance of the approximate coupled cluster singles- and doubles model CC2 in the prediction of optical rotations of organic molecules. For this purpose we employ a combination of two test sets from the literature which include small and medium-sized rigid organic molecules and a series of helicenes. CC2 calculations on molecules as large as 11-helicene became possible through a recent implementation of frequency-dependent second-order properties for CC2 which makes use of the resolution-of-the-identity approximation for the electron repulsion integrals. The results are assessed with respect to the accuracy of the absolute values of the optical rotation and the prediction of the correct sign, which is crucial for the determination of absolute configurations. The performance of CC2 is compared with that of density functional theory at the B3LYP and CAM-B3LYP levels. Furthermore we investigated the influence of the molecular geometry and the one-electron basis set and tested to which extent spin-component scaling changes the results.
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