中文摘要
本工作主要在下面几方面取得了进展。第一,研究了Benesi-Hildebrand方法的正确性与可靠性,该方法广泛应用于光谱法确定分子间相互作用比和作用强度。但我们研究发现,在某些条件下对于实际是1:2型作用的体系,B-H方程会给出错误的作用比信息,这种问题对于弱的相互作用和强的相互作用都会发生;我们研究了配体与中心分子的初态浓度比对于该方法可靠性的影响,给出了应用的条件。第二,谱峰重叠对于二维相关光谱的可靠性有很大的影响,当峰重叠严重的时候,可能产生错误的结论。我们提出了用主成分分析法对数据进行归一化处理的方法。通过数学推导和数据模拟得出,用主成分对原始数据进行归一化处理可以削弱甚至消除谱峰重叠的影响。第三,研究了二维相关光谱法对于确定(物理的或化学的)事件序列的本质,提出了半完成耗时和半时间完成分数的概念,得到了借助这两个概念来判断事件序列的方法。此外,我们还研究了超额光谱的方法学,对于若干含氢键体系进行了研究,建立了判断基团选择性相互作用、竞争性相互作用的方法。
英文摘要
Progresses have been made in several methodologies concerning spectroscopy. First, the validity and reliability of the Benesi-Hildebrand method was investigated. The method had been widely applied in determining stoichiometry and interaction strength in solutions. Our study found that it might generate wrong results for 1:2 type interactions. This could happen for both strong and weak interactions. Conditions were found so that the method can be used reliably. Second, peak overlap may generate misleading results. A method based on principal component analysis (PCA) was proposed to do data pretreatment. After that, the effect of peak overlap can be reduced markedly or even eliminated. Third, the nature of sequential order in two-dimensional correlation spectroscopy was investigated. Two concepts, namely half-time and half-intensity were proposed. It was found that the two concepts could be used to predict sequential order of events which were previously determined from two-dimensional correlation spectroscopy. In addition, we also studied the methodology of excess spectroscopy, particularly when hydrogen-bonding interaction is under concern. Method to determine selective or competitive interactions was established.
结题摘要
本工作主要在下面几方面取得了进展。第一,研究了Benesi-Hildebrand方法的正确性与可靠性,该方法广泛应用于光谱法确定分子间相互作用比和作用强度。但我们研究发现,在某些条件下对于实际是1:2型作用的体系,B-H方程会给出错误的作用比信息,这种问题对于弱的相互作用和强的相互作用都会发生;我们研究了配体与中心分子的初态浓度比对于该方法可靠性的影响,给出了应用的条件。第二,谱峰重叠对于二维相关光谱的可靠性有很大的影响,当峰重叠严重的时候,可能产生错误的结论。我们提出了用主成分分析法对数据进行归一化处理的方法。通过数学推导和数据模拟得出,用主成分对原始数据进行归一化处理可以削弱甚至消除谱峰重叠的影响。第三,研究了二维相关光谱法对于确定(物理的或化学的)事件序列的本质,提出了半完成耗时和半时间完成分数的概念,得到了借助这两个概念来判断事件序列的方法。此外,我们还研究了超额光谱的方法学,对于若干含氢键体系进行了研究,建立了判断基团选择性相互作用、竞争性相互作用的方法。
