Charge separation in the non-covalent adducts of aromatic amines and the rhenium tricarbonyl complex bearing a cyclodextrin unit on a ligand

Asao Nakamura, Takashi Imai, Yuji Oda, Satoshi Okutsu, Akihiko Ueno, Fujio Toda

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Luminescence of the rhenium tricarbonyl complex bearing a cyclodextrin unit on a ligand (1) was quenched by the diphenylamine-4-sulfonic acid included in the cavity of the cyclodextrin unit. The origin of the quenching was attributed to the electron transfer from the amine to the triplet metal-to-ligand charge transfer (MLCT) state of the rhenium complex unit. The rate of the forward electron transfer was estimated at 6.2 × 107 s-1 on the basis of the luminescence lifetime for the inclusion complex. Charge separation after the photoinduced electron transfer was verified by the observation of the transient absorption for the charge separation products. Most of the charge separation products were generated in the electron transfer process within the inclusion complex, which was proven by a large decrease in the yield of the products on the addition of a competitive guest for the cyclodextrin cavity, 1-adamantanol. The rate of the back electron transfer was estimated by the decay of the transient absorption at 4.4 × 104 s-1. Both of the rates for forward and back electron transfer were by far slower than those for a covalently-linked aniline-rhenium complex molecule.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume438
Issue number1-2
Publication statusPublished - 1997 Nov 25
Externally publishedYes

Fingerprint

Bearings (structural)
Rhenium
Cyclodextrins
Amines
Ligands
Electrons
Luminescence
Aniline
Charge transfer
Quenching
Metals
Molecules
Acids

Keywords

  • Charge separation
  • Cyclodextrin
  • Inclusion complex
  • Rhenium tricarbonyl complex
  • Supramolecules

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

Charge separation in the non-covalent adducts of aromatic amines and the rhenium tricarbonyl complex bearing a cyclodextrin unit on a ligand. / Nakamura, Asao; Imai, Takashi; Oda, Yuji; Okutsu, Satoshi; Ueno, Akihiko; Toda, Fujio.

In: Journal of Electroanalytical Chemistry, Vol. 438, No. 1-2, 25.11.1997, p. 159-165.

Research output: Contribution to journalArticle

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