密集的神经网络用于计算来自电子阴性-平衡原子电荷的溶解自由能量
1Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, Carrer Maria Aurèlia Capmany 69, 17003 Girona, Spain.
Journal of chemical information and modeling
|September 29, 2023
概括
一个新的深度神经网络,ESE-EE-DNN,准确地预测了分子和离子的溶解自由能量. 这种高效的方法与密度函数理论对各种溶剂环境的方法相竞争.
科学领域:
- 计算化学计算化学
- 物理化学 物理化学
- 机器学习在化学中的应用
背景情况:
- 准确预测溶解自由能量对于理解化学过程至关重要.
- 现有的方法,特别是基于密度函数理论 (DFT) 的方法,可能是计算密集的.
- 需要有效和准确的模型来评估各种溶剂类型的溶解自由能量.
研究的目的:
- 引入一种新的深度神经网络模型,ESE-EE-DNN,用于评估无溶解能量.
- 与已知的计算方法相比,评估ESE-EE-DNN的准确性和效率.
- 为了证明该模型在不同溶剂环境中的中性分子和离子物种的适用性.
主要方法:
- 开发一个密集的神经网络 (NN) 模型,命名为轻松溶解能量与电子负性均电荷和密集的神经网络 (ESE-EE-DNN).
- 使用导体样选模型 (COSMO) 静电能量,原子腔表面积,原子腔总体积和诱导的表面电荷作为输入特征.
- 在COSMO计算中采用电子阴性平衡原子电荷.
主要成果:
- ESE-EE-DNN实现了高精度,中性溶液的根平均平方误差 (RMSE) 为1.25kcal/mol (水),1.36kcal/mol (极地protic),0.70kcal/mol (极地aprotic) 和0.71kcal/mol (非极地).
- 该模型证明了离子溶液的特殊强度,产生2.82 kcal/mol (水性) 和1.42 kcal/mol (非水性) 的RMSEs.
- ESE-EE-DNN的准确性与主流的基于DFT的方法相比或更高,并且提供了显著的计算效率.
结论:
- ESE-EE-DNN提供了一个非常准确和高效的方法来预测无溶解能量的能量.
- 该模型在不同类型的溶液 (中性和离子) 和溶剂环境中的性能突显了其多功能性.
- 计算效率,源于快速的电子负性-均值电荷评估,使ESE-EE-DNN成为计算化学研究的宝贵工具.
更多相关视频
08:54Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
Published on: January 25, 2020
5.7K
12:11Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
Published on: April 8, 2020
8.2K
相关概念视频
Entropy and Solvation
7.1K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
7.1K
Calculations of Electric Potential II
1.7K
An electric dipole is a system of two equal but opposite charges, separated by a fixed distance. This system is used to model many real-world systems, including atomic and molecular interactions. One of these systems is the water molecule, but only under certain circumstances. These circumstances are met inside a microwave oven, where electric fields with alternating directions make the water molecules change orientation. This vibration is equivalent to heat at the molecular level.
Consider a...
Consider a...
1.7K
Calculating Standard Free Energy Changes
21.4K
The free energy change for a reaction that occurs under the standard conditions of 1 bar pressure and at 298 K is called the standard free energy change. Since free energy is a state function, its value depends only on the conditions of the initial and final states of the system. A convenient and common approach to the calculation of free energy changes for physical and chemical reactions is by use of widely available compilations of standard state thermodynamic data. One method involves the...
21.4K
Solvating Effects
7.5K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
7.5K
Chemical and Solubility Equilibria
4.1K
The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
4.1K
Molecular Geometry and Dipole Moments
13.1K
The VSEPR theory can be used to determine the electron pair geometries and molecular structures as follows:
13.1K
