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  • 學位論文

苯胺寡聚物的電化學與光譜研究

Electrochemical and Spectral Studies on the Oligomers of Aniline

指導教授 : 蘇玉龍

摘要


本論文包含兩大主題,第一個主題是在探討苯胺寡聚物的合成、電化學與光譜電化學研究。本研究針對苯胺寡聚物在對位位置不同的長度作其電化學與光譜電化學的探討。研究發現,當苯胺的分子越長時,第一個氧化的電位越負,表示苯胺分子越長,越容易被氧化。由透光薄層電化學法(optically transparent thin-layer electrochemistry , OTTLE)可以得知,當這些苯胺寡聚物在第一個電子氧化後在NIR處會有吸收峰出現,這是由於Intervalence - Charge Transfer (IV-CT) 所引起,當氧化至第二個電子時,這個吸收峰便會消失。 第二個主題則是研究含氮-氫鍵的苯胺化合物藉由滴定不同的受質,利用電化學與光譜電化學的方式觀察化合物氧化後與受質產生氫鍵的能力。在循環伏安法中可以得知,此類的苯胺化合物,當受質加入後,第一氧化還原對幾乎不受影響,而第二個氧化還原對會隨著受質濃度的增加會往負的電位偏移。這也說明,當苯胺上的氫原子經過氧化後會與受質上的氧原子或氮原子產生氫鍵。在光譜電化學方面,苯胺中加入不同濃度的受質,當濃度增加,苯胺離子原本的吸收值會受到受質的加入而有減少,但波長沒有明顯的改變。

並列摘要


This thesis involves two topics. The first one has been concerned with the synthesis , electrochemical as well as spectral studies of aniline oligomers. For a series of straight chain arylamines, the oxidation potential is more negative as the chain length increases. Spectroelectrochemical results has shown the near IR spectra of the cation radicals upon first electron oxidations. The second topics has been on the electrochemically induced hydrogen bonding between the oxidation forms of amines and various oxygen and nitrogen containing receptors. In the presence of a receptor, the first oxidation wave remained unchanged while the second one shifts in redox potential in cyclic voltammetry. The hydrogen atom in the oxidized amines forms hydrogen bonding with the receptors and the degree of interaction is reflected in the potential shift. Spectroelectrochemistry also has revealed the interaction by way of the absorbance change as a function of the receptor concentration.

參考文獻


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