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科学通报  2011 

水合锰(Ⅱ)结构的量子化学和ABEEM/MM研究

DOI: 10.1360/972010-2367, PP. 1530-1538

Keywords: 水合锰离子,离子溶剂化,ABEEM/MM,量子化学计算,可极化分子力场

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Abstract:

应用新一代可极化分子力场——原子-键电负性均衡浮动电荷分子力场ABEEM/MM,结合精密量子化学方法,构建了精确的Mn2+-H2O相互作用的势能函数,确定了相关参数.将该势能函数用于计算[Mn(H2O)n]2+(n=1~12)的结构和结合能,得到了与量子化学一致的结果.进一步对Mn2+水溶液进行ABEEM/MM动力学模拟,得到的Mn2+–O径向分布函数的第一和第二最高峰分别处于0.218和0.435nm处,积分得到第一和第二水合层的配位水分子数分别为7.03和17.74;对于O–Mn2+–O角度分布函数,其第一和第二最高峰分别位于80°和140°附近,这些结果与实验和其他理论方法的结果有很好的一致性.Mn2+的极化作用使得第一水合层中水分子的键长明显增长,键角明显减小;而Mn2+对第二水合层及外层水分子的结构影响较小.分析体系的电荷分布表明,与ABEEM-7P纯水相比,Mn2+水溶液中参与形成氢键的氢原子和孤对电子的电荷变化较大,且Mn2+和其邻近的水分子间存在明显的电荷转移.

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