Department of Chemistry, University of Opole, 48, Oleska Street, 45-052 Opole, Poland.
Magn Reson Chem. 2009 Nov;47(11):959-70. doi: 10.1002/mrc.2500.
Good performance of segmented contracted basis sets XZP, where X = D, T, Q and 5, for obtaining H(2)O, H(2), HF, F(2) and F(2)O nuclear isotropic shielding constants in the BHandH Kohn-Sham basis set limit was shown. The results of two- and three-parameter complete basis set limit extrapolation schemes were compared with experimental results, earlier literature data and benchmark ab initio results. Similar convergence patterns of shieldings obtained from calculations using general purpose XZP basis sets and from polarization-consistent basis sets pcS-n and pcJ-n, where n = 0, 1, 2, 3 and 4, designed to accurately predict magnetic properties were observed. On the contrary, the SSCCs were more sensitive to the XZP basis set size and generally less accurate than those estimated using pcJ-n basis set family. The BHandH density functional markedly outperforms B3LYP method in predicting heavy atom shieldings and SSCCs values in the studied systems.
分段紧缩基组 XZP(其中 X = D、T、Q 和 5)在获得 BHandH Kohn-Sham 基组极限下 H(2)O、H(2)、HF、F(2) 和 F(2)O 核各向同性屏蔽常数方面表现出良好的性能。二参数和三参数完全基组极限外推方案的结果与实验结果、早期文献数据和基准从头算结果进行了比较。使用通用 XZP 基组和设计用于准确预测磁性的极化一致基组 pcS-n 和 pcJ-n(n = 0、1、2、3 和 4)进行计算所得到的屏蔽值具有相似的收敛模式。相反,SSCC 对 XZP 基组大小更为敏感,通常不如使用 pcJ-n 基组族估计的那么准确。BHandH 密度泛函在预测研究体系中重原子屏蔽和 SSCC 值方面明显优于 B3LYP 方法。