臺灣博碩士論文加值系統

本論文是以電化學方法研究雙性非水介質(Amphiprotic Non-Aqueous
Media)中溶劑與溶質之化學與物理性質。所採用之溶劑為甲醇與乙醇兩
種 , 除了用純甲醇與純乙醇之外, 也以不同比例的甲醇與乙醇混合液為
溶劑。溶質則為苯甲酸(Benzoic Acid)的鄰位、間位、對位的鹵化、甲基
與硝基衍生物。本研究以電導法(Conductometry) 為主要實驗方法, 並透
過介面卡與電化學自動滴定儀聯線, 可自動由儀器取得實驗數據與圖形。
並利用與之聯接的微電腦, 用自行撰寫的電腦程式計算出所需要的電化學
數據。前述溶質在不同之雙性非水溶質在溶劑中的酸性解離常數(
Dissoci- ation Constant）為討論溶質在溶劑中電化學行為的主要項目,
由下列兩方面來討論解離常數的變化情形:一. 溶劑的化學與物理性質如
介電常數、自解常數、粘滯性等對溶質酸性解離常數變化的影響。二. 溶
質官能基的種類與位置對其在溶劑中酸性解離常數變化的影響。

The major works of this research is to study the affect of
dielectric constant, autoprotolysis constant, and other
physical or chemical constants of mixed amphiprotic solvents on
the dissociation of derivatives of benzoic acid. The PKa values
was estimated by conductometric method. Personal computer which
was connected with conductometer was used not only for
recording the data in measurements but also for caculating the
results of experiment. The mixtures of water,methanol and
ethanol in different ratio was used as amphirpotic solvents,
and the derivatives of benzoic acid was used as solutes. The
PKa value of solutes in different mixed solvents and the
effects of physical constants of solvents and the structures of
solutes was widely discussed in this paper.