OPLS/2020 不和碳化合物,酒精和以太的强力场
William L Jorgensen1, Mohammad M Ghahremanpour1, Anastasia Saar1
1Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States.
The journal of physical chemistry. B
|December 21, 2023
概括
更新的OPLS/2020力场改进了有机分子的建模. 这种增强的力场减少了预测各种化学组液体性质和水合的自由能量的错误.
科学领域:
- 计算化学计算化学
- 分子建模分子建模
- 物理化学 物理化学
背景情况:
- OPLS全原子力场对于分子模拟至关重要.
- 准确的模拟各种有机分子,包括不和碳化合物,酒精和,对于各种科学应用是必不可少的.
- 之前的力场在准确预测某些化学组的性质方面存在局限性.
研究的目的:
- 更新和验证OPLS全原子力场,以改善不和碳化合物,酒精和以太的建模.
- 评估修改力场在预测气相能量,纯液体特性和水合的自由能量方面的性能.
- 报告较少常见的有机组的参数,扩大力场的适用性.
主要方法:
- 使用蒙特卡洛 (MC) 统计力学来建模60种纯液体.
- 采用了强大的,自动化的自由能量扰动 (FEP) 程序,用于高精度的液化计算.
- 在较大的分子上测试了力场,并介绍了基,基,基和基的参数.
主要成果:
- 与实验数据相比,修改后的OPLS/2020力场对纯液体属性的准确性得到了改进.
- 获得的平均无标记误差为0.01 g/cm3的液体密度和0.2 kcal/mol的蒸发热量.
- 获得了水解的自由能量平均误差为1.2 kcal/mol,并注意到对疏水性有系统的高估.
结论:
- OPLS/2020力场代表了对广泛的有机分子建模的显著改进.
- 更新的参数和方法提高了对液体特性和无水化能量的预测能力.
- 这些发现对使用标准力场准确建模生物分子系统有意义.
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