Fluorescence Emission Behaviors of the L-Cysteine/Au(I) Complex in a Cyclodextrin-Based Metal-Organic Framework
| Autor: | Anna Nagai, Katsuki Kusakabe, Mina Sakuragi, Tadashi Okobira, Wataru Michida |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Photoluminescence
Bioengineering 02 engineering and technology 010402 general chemistry Photochemistry lcsh:Chemical technology 01 natural sciences Oligomer crystal lcsh:Chemistry chemistry.chemical_compound Chemical Engineering (miscellaneous) Molecule porous material lcsh:TP1-1185 chemistry.chemical_classification Quenching (fluorescence) Cyclodextrin Chemistry Process Chemistry and Technology fungi 021001 nanoscience & nanotechnology Fluorescence 0104 chemical sciences Nanopore lcsh:QD1-999 Metal-organic framework photoluminescence aggregation-induced emission (AIE) 0210 nano-technology |
| Zdroj: | Processes, Vol 8, Iss 1555, p 1555 (2020) Processes Volume 8 Issue 12 |
| ISSN: | 2227-9717 |
| Popis: | Aggregation-induced emission (AIE) molecules are nonemissive in dilute solution but emit intensely upon aggregation in complete contrast to aggregation-caused quenching (ACQ) molecules. The emission of ACQ molecules, such as fluorescein, that have been encapsulated into the hydrophilic nanopores in a cyclodextrin-based metal-organic framework (CD-MOF) was reported to be enhanced due to the disappearance of concentration quenching and the restriction of thermal motion. However, the contribution of the restriction of thermal motion in CD-MOF could not be elucidated. In this study, an AIE-active L-cysteine/Au(I) (L-Cys/Au(I)) complex was synthesized and introduced into the nanopores of CD-MOF via a co-crystallization method. We determined the amount and chemical composition of the L-Cys/Au(I) complex in CD-MOF. The fluorescence intensity of the L-Cys/Au(I)@CD-MOF composite was investigated. The L-Cys/Au(I) complex that was synthesized from Au(III) chloride and L-cysteine was found to be a linear oligomer consisting of Cys5Au4. For the L-Cys/Au(I)@CD-MOF composite with a L-Cys/Au(I) complex of 0.45 per hydrophilic nanopore, the total fluorescence intensity of the isolated L-Cys/Au(I) complex in CD-MOF exceeded that of the L-Cys/Au(I) complex in the solid-state due to the restriction of the thermal motion without the aggregation of the complex. |
| Databáze: | OpenAIRE |
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