1The fundamental photochemistry of lead oxides 2 The complex reaction of pyridylcarboxylic acids and cyclodextrins
| Autor: | Liu, C. I., 劉俊逸 |
|---|---|
| Rok vydání: | 1996 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 84 1. 近數年來的研究發現氧化鉛在強鹼溶液中會形成二主要之錯合物 PbIV(OH)62-， PbII(OH)3-。受到255 nm之紫外光照射時，二者會相互進 行氧化還原反應而達於一平衡狀態，同時會產生H2O2，其可分解污染物。 此外，二種物種分解時產生OH自由基( OH‧)，亦可分解污染物。 吾人製備氧化鉛粉末電極( PbOx powder electrodes)、氧化鉛薄膜電極( PbOx thin-filmed electrodes )、氧化鉛沸石電極( PbOx zeolite electrodes )等三種氧化鉛( PbOx)電極，並進行一些氧化鉛基本光電化 學的研究。2. 在本實驗室曾對光誘發氫離子轉移光閥進行研究，發現 啶 酸為一優良之敏光性物質，其光電效應隨環糊精之加入而增強。本論 文則研究敏光性物質( 啶 酸)與環糊精錯合反應，發現加入環糊精約為 啶 酸之4~5當量時，其光電效應已至飽合，此乃因環糊精與 啶 酸作 用所致。 啶 酸主要以 啶環與環糊精作用，而 啶 酸之烷基側鍊增 長則降低錯合之效應。推究其原因可能為凡得瓦力與氫鍵同時降低錯合反 應之能量。 1. In recent years, research finds that PbO in strong basic solutions may produce PbIV(OH)62-, PbII(OH)3- species. Under 255 nm UV illumination, they can proceed redox reaction and reach an equilbrium in between. In these reactions, H2O2, one of the by-products which can decompose pollutants. In these degradation reactions, OH free radical may be produced and able to decompose the pollutes .In this study, we prepare PbOx powder electrodes, PbOx thin-filmed electrodes, PbOx zeolite electrodes, and conduct a series of fundamental characterization for them .2. Rescently, our laboratory studied the photo-induced proton transfer reactions, and found 2-pyridylcarboxylic acids ( 2PCA, 2PAA, 3PPA ) are excellant photo-induced proton transfer reagent. The photo-electric effect of 2-pyridylcarboxylic acids is enhanced when cyclodextrin (CD) is added. In this study, we find that the ratio of 2-pyridylcarboxylic acids to CD is 1:4~5, the effect reaches a saturated value. This effect is caused by 2-pyridylcarboxylic acid--CD complex reaction. Besides, longer alkane side chain reduces the complex ability with 2-pyridylcar- boxylic acids. This is attributable to the van der Waal'sforce and hydrogen bonding effect . |
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