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Extension of the AMBER force field for nitroxide radicals and combined QM/MM/PCM approach to the accurate determination of EPR parameters of DMPOH in solution

机译:扩展亚硝酸根自由基的AMBER力场并结合QM / MM / PCM方法精确测定溶液中DMPOH的EPR参数

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摘要

A computational strategy that combines both time-dependent and time-independent approaches is exploited to accurately model molecular dynamics and solvent effects on the isotropic hyperfine coupling constants of the DMPO-H nitroxide. Our recent general force field for nitroxides derived from AMBER ff99SB is further extended to systems involving hydrogen atoms in β-positions with respect to NO. The resulting force-field has been employed in a series of classical molecular dynamics simulations, comparing the computed EPR parameters from selected molecular configurations to the corresponding experimental data in different solvents. The effect of vibrational averaging on the spectroscopic parameters is also taken into account, by second order vibrational perturbation theory involving semi-diagonal third energy derivatives together first and second property derivatives.
机译:利用一种结合了时间和时间无关方法的计算策略来精确地模拟分子动力学和溶剂对DMPO-H氮氧化物各向同性超细偶合常数的影响。我们最近对源自AMBER ff99SB的氮氧化物的一般作用力场进一步扩展到涉及相对于NO处于β位氢原子的系统。由此产生的力场已用于一系列经典的分子动力学模拟中,将计算出的EPR参数从选定的分子构型与不同溶剂中的相应实验数据进行了比较。通过二阶振动摄动理论,也考虑了振动平均对光谱参数的影响,该理论涉及半对角第三能量导数以及第一和第二性质导数。

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