The structural properties of the anticancer drug NAMI - A in aqueous solution were studied by the method combining applied quantum mechanics (QM) with the ABEEM fluctuating charge force field (ABEEM/MM). All the structural optimizations were completed under the B3LYP method of DFT with 6 - 31G(d,p) and LanL2DZ basis sets without any restrictive conditions. The results show that the optimized NAMI - A configurations change under the influence of different environments and methods. Compared with the configurations obtained in the gas phase, the configurations obtained by QM/MM iterative optimization change more significantly than those of PCM. The changes of the NAMI - A configurations obtained by QM/MM (ABEEM/MM) iterative optimization are smaller than those of QM/MM (OPLS - AA). In conclusion, the solvent through polarization...
应用量子力学(QM)与ABEEM浮动电荷力场(ABEEM/MM)相结合的方法研究了抗癌药物NAMI-A在水溶液中的结构性质.所有的结构优化都是在DFT的B3LYP方法下采用6-31G(d,p)和LanL2DZ基组完成的,没有加入任何限制性条件.结果表明,优化得到的NAMI-A构型受不同环境及方法的影响均有变化.与气相中得到的构型相比,QM/MM迭代优化得到构型要比PCM的构型变化更明显.QM/MM(ABEEM/MM)迭代优化得到的NAMI-A构型比QM/MM(OPLS-AA)的变化要小.总之,溶剂通过极化