16.6 cm-1 respectively. Using linear correlations instead of scaling factors improves the prediction accuracy significantly for all functionals. Experimental and computed spectra for a single complex can show significant differences even when the molecular structure is calculated correctly, and a means of defining confidence limits for any given computed structure is also provided.
这项工作旨在改进使用DFT方法计算气相阳离子红外光谱的方法。十种Zn和Ru有机
金属配合物的实验IR
MPD光谱已用于为900-2000 cm-1范围内的64种振动模式提供参考数据。已通过五个DFT功能和三个基础集评估了为这些频段预测的IR振动频率的准确性。功能包括流行的B3LYP和M06-2X
氢化物以及范围分离的杂种(RSH)CAM-B3LYP,LC-BLYP和w
B97X-D。B3LYP的最佳平均绝对误差(MAE)和均方根误差(RM
SE)值分别为7.1和9.6 cm-1,而最佳的RSH功能w
B97X-D分别为12.8和16.6 cm-1。使用线性相关而不是比例因子可以显着提高所有功能的预测准确性。