以非線性Stern–Volmer方程式探討金屬有機骨架螢光猝滅行為

本研究利用螢光光譜來探討中心金屬為Al的金屬有機骨架與甲基紅異構物（鄰位、對位和間位）進行螢光猝滅之研究。甲基紅染料吸附在金屬有機骨架後，金屬有機骨架螢光強度會隨著染料濃度的增加而減少。在相同金屬有機骨架下利用不同甲基紅染料來觀察猝滅能力或利用不同金屬有機骨架在相同的甲基紅染料下來探討結構對猝滅之影響。當使用甲基紅異構物作為猝滅劑時，藉由分析CYCU-4(Al)，DUT-4(Al)，MIL-69(Al)以及MIL-100(Al)的Stern-Volmer圖可以觀察到非線性曲線趨勢。原因與金屬有機骨架和甲基紅的結構性質相關，如金屬有機骨架配位基的不同及甲基紅異構物取代基位置的不同。另一方面，透過Stern-Volmer圖的非線性曲線觀察到金屬有機骨架與甲基紅之猝滅行為中動態猝滅與靜態猝滅是同時存在的。最後，為了進一步了解金屬有機骨架與甲基紅之猝滅行為。我們利用溫度效應來區分動態猝滅與靜態猝滅。當溫度增加時曲線斜率增加，猝滅行為偏向於動態猝滅。相反的，溫度增加時曲線斜率降低，猝滅行為偏向於靜態猝滅。詳細之結果將於論文中討論。

關鍵字

非線性；金屬有機骨架；螢光猝滅

並列摘要

In this study, fluorescence spectroscopy was used to investigate fluorescence quenching between metal–organic frameworks (MOFs) consisting of Al centers and methyl red isomers (ortho, para, and meta). After the methyl red dyes had been adsorbed onto the metal-organic frameworks, the intensity of their fluorescence decreased as the concentration of the dye increased. The effects of the molecular structure on the fluorescence quenching were investigated using the same MOF with different methyl red dyes, or the same methyl red dye with different MOFs. When methyl red isomers were used as fluorescence quenchers, non-linear trends were observed in the CYCU-4(Al) DUT-4(Al), MIL-69(Al), and MIL-100(Al) Stern-Volmer plots. The reason for this is related to the structural properties of the MOFs and methyl red, e.g. variations in MOF ligand and differences in the substituent positions of the methyl red isomers. In addition, the non-linear curves of the Stern-Volmer plots indicated that dynamic and static fluorescence quenching between methyl red and the MOFs occurred simultaneously. Finally, to improve our understanding of the quenching behaviors of MOFs and methyl red, the temperature effect was used to differentiate the dynamic and static quenching behaviors. If the slope of the Stern-Volmer plots increased as the temperature increased, the quenching behavior was dominated by dynamic quenching. Conversely, if the slope decreased as temperature increased, then the quenching behavior was dominated by static quenching. The results will be discussed in detail in this paper.

並列關鍵字

fluorescence quenching ； metal-organic frameworks ； non-linear Stern–Volmer

參考文獻

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以非線性Stern–Volmer方程式探討金屬有機骨架螢光猝滅行為

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