Supramolecular Surface Photochemistry: Cascade Energy Transfer between Encapsulated Dyes Aligned on a Clay Nanosheet Surface

Takamasa Tsukamoto, Elamparuthi Ramasamy, Tetsuya Shimada, Shinsuke Takagi, Vaidhyanathan Ramamurthy

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)2920-2927
Number of pages8
JournalLangmuir
Volume32
Issue number12
DOIs
StatePublished - Mar 29 2016

Fingerprint

Nanosheets
Photochemical reactions
photochemical reactions
Energy transfer
clays
cascades
Clay
Coloring Agents
Dyes
dyes
energy transfer
Coumarins
emission spectra
Supramolecular chemistry
chemistry
capsules
Surface chemistry
Ammonium Compounds
Merging
excitation

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Cite this

Supramolecular Surface Photochemistry : Cascade Energy Transfer between Encapsulated Dyes Aligned on a Clay Nanosheet Surface. / Tsukamoto, Takamasa; Ramasamy, Elamparuthi; Shimada, Tetsuya; Takagi, Shinsuke; Ramamurthy, Vaidhyanathan.

In: Langmuir, Vol. 32, No. 12, 29.03.2016, p. 2920-2927.

Research output: Contribution to journalArticle

Tsukamoto, Takamasa ; Ramasamy, Elamparuthi ; Shimada, Tetsuya ; Takagi, Shinsuke ; Ramamurthy, Vaidhyanathan. / Supramolecular Surface Photochemistry : Cascade Energy Transfer between Encapsulated Dyes Aligned on a Clay Nanosheet Surface. In: Langmuir. 2016 ; Vol. 32, No. 12. pp. 2920-2927.
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