在 [2,2'-双]-3-3'-二醇分子中,协同与阶段性质子转移反应:静态和动态ab-initio调查
Lorenzo Briccolani-Bandini1, Eric Brémond2, Marco Pagliai1
1Dipartimento di Chimica "Ugo Schiff", Università degli Studi di Firenze, Sesto Fiorentino, Italy.
这项研究探讨了[2,2'-二氧化]-3-3'-二醇中的双质子转移. 协调的机制被排除在外,与逐步的质子转移机制.
科学领域:
- 计算化学的计算化学
- 物理化学 物理化学
- 分子动力学分子动力学
背景情况:
- 双质子转移 (PT) 反应在化学和生物系统中至关重要.
- 分子[2,2′-双]-3-3′-二醇表现出复杂的质子运动与电子结构变化相结合.
- 了解机制 (协同与逐步) 是阐明反应途径的关键.
研究的目的:
- 为了研究 [2,2′-双]-3-3′-二醇中的双质子转移机制.
- 为了区分协同和逐步的质子转移途径.
- 分析计算方法对机制确定的影响.
主要方法:
- 探索潜在能量表面 (PES) 和自由能量表面 (FES).
- 使用密度函数理论 (DFT) 与各种交换相关函数.
- 计算建模和理论分析.
主要成果:
- 协调的双质子转移机制被最终排除在外.
- 阶段性质子转移机制的特性高度依赖于所选择的DFT函数.
- 一些函数暗示了中间体和两个过渡状态的逐步机制,而另一些则表明了具有单个过渡状态的异步转移.
结论:
- 在这个分子中,对于双 PT,协调机制是不可行的.
- 阶段性质子转移机制是最受青的,但其详细配置因计算方法而异.
- 在DFT中精确的功能选择对于正确描述质子转移通路至关重要.
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