首页> 外文期刊>Journal of chemical theory and computation: JCTC >Systematic Comparison of Second-Order Polarization Propagator Approximation(SOPPA)and Equation-of-Motion Coupled Cluster Singles and Doubles (EOM-CCSD)Spin-Spin Coupling Constants for Molecules with C,N,and O Double and Triple Bonds and Selected F-Su
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Systematic Comparison of Second-Order Polarization Propagator Approximation(SOPPA)and Equation-of-Motion Coupled Cluster Singles and Doubles (EOM-CCSD)Spin-Spin Coupling Constants for Molecules with C,N,and O Double and Triple Bonds and Selected F-Su

机译:具有C,N和O双键和三键以及所选F-的分子的二阶极化传播器近似(SOPPA)和运动方程耦合簇单双态(EOM-CCSD)自旋自旋耦合常数的系统比较苏

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摘要

Ab initio EOM-CCSD and SOPPA calculations with the Ahlrichs(qzp,qz2p)basis set have been carried out to evaluate one-,two-,and three-bond spin-spin coupling constants for molecules H_mX=YH_n and H_mX ident to YH_n for X,Y=~(13)C,~(15)N,and ~(17)O,and selected ~(19)F-substituted derivatives.In the great majority of cases,EOM-CCSD one-bond C-C,C-N,C-O,C-F,N-N,N-O,and N-F coupling constants and three-bond F-F coupling constants are smaller in absolute value than the corresponding SOPPA coupling constants,with the EOM-CCSD values in better agreement with experimental data.SOPPA tends to significantly overestimate the absolute values of large one-and three-bond couplings involving fluorine.The majority of two-bond SOPPA coupling constants are in better agreement with experiment than EOM-CCSD,although differences between EOM-CCSD and experimental values are not dramatic.A statistical analysis of thirty EOM-CCSD and SOPPA coupling constants versus experimental coupling constants demonstrates that better agreement with experiment is found when EOM-CCSD is the computational method.
机译:已经进行了基于Ahlrichs(qzp,qz2p)的从头算EOM-CCSD和SOPPA计算,以评估分子H_mX = YH_n的一键,二键和三键自旋-自旋偶合常数,以及与YH_n相同的H_mX X,Y =〜(13)C,〜(15)N和〜(17)O,并选择〜(19)F取代的衍生物。在大多数情况下,EOM-CCSD单键CC,CN ,CO,CF,NN,NO和NF耦合常数以及三键FF耦合常数的绝对值小于相应的SOPPA耦合常数,而EOM-CCSD值与实验数据更好地吻合。SOPPA倾向于大大高估较大的一键和三键涉及氟的绝对值。两键SOPPA耦合常数大多数都比EOM-CCSD与实验更吻合,尽管EOM-CCSD与实验值之间的差异并不明显。对30个EOM-CCSD和SOPPA耦合常数与实验耦合常数的分析表明当EOM-CCSD是一种计算方法时,可以找到与实验更好的一致性。

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