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环境化学  2015 

Mg2+配位作用对磺胺嘧啶结构及吸收光谱影响的计算模拟及验证

Keywords: 配位作用,Mg2+,磺胺嘧啶,量子化学,吸光性质

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Abstract:

以磺胺嘧啶为模型化合物,基于量子化学密度泛函理论(DFT),通过结构优化及相互作用能的计算,预测Mg2+与磺胺嘧啶形成11配合物的结构.结果表明,Mg2+和磺酰胺基的N和O原子配位,同时结合一个水分子;配合物磺酰胺基的键长、键角和二面角发生明显变化.基于含时密度泛函理论(TD-DFT)方法,计算磺胺嘧啶及其配合物的吸光性质.结果表明,Mg2+的配位作用影响前线分子轨道分布和能级,体系吸收光谱发生红移,增强了磺胺嘧啶的吸光能力,实验验证与计算结果基本一致.

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