本實驗使用酸鹼中和合成13種質子型離子液體，其中陽離子以五圓環為基礎，分別加入拉電子基羰基 (carbonyl group)作為取代基以及使用imidazole作為替代的陽離子，陰離子則使用各種的酸 （formic acid、sulfuric acid、trifluoroacetic acid、fluoroboric acid、methanesulfonic acid）當作陰離子變化的來源，除此之外我們也合成不同酸鹼比例的質子型離子液體。
我們測量質子型離子液體的酸度和極性以及在不同溫度下密度、黏度、導電度的大小，並探討陰陽離子結構變化對這些物理性質的影響。同時也使用核磁共振技術，測量陰陽離子的擴散係數，經計算出其陰離子與陽離子的比擴散係數，可以得知陰陽離子之間有強烈的相關聯性。除此之外，還可藉此計算出陰陽離子的解離程度，從NMR實驗中我們可以知道每個質子型離子液體都會產生聚集，因聚集而產生的離子團簇數量都不相同，因此影響了其物理性質的表現。
結果顯示，每個質子型離子液體的陰離子與陽離子的擴散係數會隨著溫度升高而上升，而且質子型離子液體的陰離子擴散係數都會大於陽離子的擴散係數，除了[MePyrone][CH3SO3]以外。
不同陰離子的質子型離子液體的密度隨起始物酸的密度變大而增大，其黏度隨起始物酸與鹼的pKa差值 （△pKa）越大而上升，導電度、擴散係數、解離程度下降。隨著起始物酸的酸性上升，其質子型離子液體的酸性與極性就越大
不同陽離子的質子型離子液體的密度、黏度隨著氫鍵與偶極偶極作用力增加而變大，導電度、擴散係數、解離程度下降。而其酸性隨著解離程度下降而上升。
不同酸鹼比例的質子型離子液體，隨著起始物酸的比例上升，其黏度、酸性下降，而密度、導電度、擴散係數、解離程度、極性上升。

We synthesized thirteen protic ionic liquids (PILs) through acid-base neutralization reaction. Based on five-membered-ring and pyrrolidine, the cation of these PILs were altered by introducing an electron-withdrawing group as a substituent, and replaced with imidazole. The anion of these PILs were alternative of following five acids, formic acid, sulfuric acid, trifluoroacetic acid, fluoroboric acid and methanesulfonic acid. In addition to use base:acid ratios (1:1) to synthesize protic ionic liquids, we also applied different base:acid ratios (1:2 and 1:4).
We measured the physical properties, like density, viscosity, and conductivity of these PILs under variable temperature, and also measured their acidity and polarity under room temperature to help us understand the influence upon these physical properties when changing cation and anion in PILs. Moreover, we applied nuclear magnetic resonance technique to measure the particular diffusion coefficient of cation and anion in PILs. In this way, we calculated the dissociation of PILs from diffusion coefficient of cation and anion. As a result, we can know that the cation and anion of all PILs would aggregate, and it would produce cluster which has bulky volume. Due to the cluster that was produced, it would bring about benefit or damage to these five physical properties.
The results show that every diffusion coefficient of cation and anion for all PILs increases when the temperature raises. All of diffusion coefficient of anion for these PILs is greater than their diffusion coefficient of cation, except [MePyrone][CH3SO3].
The density of PILs with different anions increases when the density of reactant acid increases. Besides, with the increasing in viscosity of the PILs with different anions and decreasing in conductivity, dissociation and diffusion coefficient, the variation of pKa between acid and base of reactant increases. The greater the acid of the reactant is, the greater the acid and polarity of PILs.
According to hydrogen bond and dipole-dipole interaction increase, the viscosity and density of PILs which are based on different cations increases, but conductivity, dissociation and diffusion coefficient decrease. In addition, when the dissociation of PILs with different cations decreases, then the acidic of them would increase.
When reactant acid ratio begins increasing, density, conductivity, dissociation and diffusion coefficient of different base:acid ratios (1:2 and 1:4) PILs increase, but the viscosity and acidic would decrease.

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