2016年3月29日
Supramolecular Surface Photochemistry: Cascade Energy Transfer between Encapsulated Dyes Aligned on a Clay Nanosheet Surface
Langmuir
- ,
- ,
- ,
- ,
- 巻
- 32
- 号
- 12
- 開始ページ
- 2920
- 終了ページ
- 2927
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acs.langmuir.5b03962
- 出版者・発行元
- American Chemical Society (ACS)
Three coumarin derivatives (7-propoxy coumarin, coumarin-480, and coumarin-540a, 2, 3, and 4, respectively) having different absorption and emission spectra were encapsulated within a water-soluble organic capsule formed by the two positively charged ammonium-functionalized cavitand octaamine (OAm, 1). Guests 2, 3, and 4 absorb in ultraviolet, violet, and blue regions and emit in violet, blue, and green regions, respectively. Energy transfer between the above three coumarin@(OAm)2 complexes assembled on the surface of a saponite clay nanosheet was investigated by steady-state and time-resolved emission techniques. Judging from their emission and excitation spectra, we concluded that the singlet-singlet energy transfer proceeded from 2 to 3, from 2 to 4, and from 3 to 4 when OAm-encapsulated 2, 3, and 4 were aligned on a clay surface as two-component systems. Under such conditions, the energy transfer efficiencies for the paths 2∗ to 3, 2∗ to 4, and 3∗ to 4 were calculated to be 33, 36, and 50% in two-component systems. When all three coumarins were assembled on the surface and 2 was excited, the energy transfer efficiencies for the paths 2∗ to 3, 2∗ to 4, and 3∗ to 4 were estimated to be 32, 34, and 33%. A comparison of energy transfer efficiencies of the two-component and three-component systems revealed that excitation of 2 leads to emission from 4. Successful merging of supramolecular chemistry and surface chemistry by demonstrating novel multi-step energy transfer in a three-component dye encapsulated system on a clay surface opens up newer opportunities for exploring such systems in an artificial light-harvesting phenomenon.
- リンク情報
-
- DOI
- https://doi.org/10.1021/acs.langmuir.5b03962
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/26963843
- URL
- https://pubs.acs.org/doi/pdf/10.1021/acs.langmuir.5b03962
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84962433699&origin=inward
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84962433699&origin=inward
- ID情報
-
- DOI : 10.1021/acs.langmuir.5b03962
- ISSN : 0743-7463
- eISSN : 1520-5827
- ORCIDのPut Code : 60645411
- PubMed ID : 26963843
- SCOPUS ID : 84962433699