Anomalous luminescence of a bicapped [60]fullerene–γ-cyclodextrin complex at an oxide-covered aluminium cathode

Autor:	R. Mäki, Keijo Haapakka, Timo Ala-Kleme
Rok vydání:	2002
Předmět:	Zirconium Materials science Fullerene Inorganic chemistry Tantalum Oxide General Physics and Astronomy chemistry.chemical_element Acceptor Higher fullerenes chemistry.chemical_compound chemistry Aluminium Aluminium oxide Physical and Theoretical Chemistry
Zdroj:	Physical Chemistry Chemical Physics. 4:3055-3060
ISSN:	1463-9084 1463-9076
DOI:	10.1039/b108679k
Popis:	A bicapped [60]fullerene–γ-cyclodextrin complex has been prepared in an aqueous boric acid–caesium borate buffer. It is shown that this water-soluble complex generates an anomalous [60]fullerene specific blue–green emission at the cathodically polarized aluminium/aluminium oxide interface but not at the zirconium/zirconium oxide and tantalum/tantalum oxide interfaces. A mechanistic pathway for the formation of this emission is proposed: the cathodic polarization of the aluminium/aluminium oxide interface injects a hot electron from the conduction band edge of the aluminium oxide to the higher acceptor levels 2t2g and/or 4ag of [60]fullerene. The relaxation of these acceptor levels to the 5t1u level (LUMO) of [60]fullerene initiates the intense emission peaking at around 445 nm. Further, use of this cathodic electroluminescence (EL) for the recognition of [60]fullerene from its mixtures with higher fullerenes is proposed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f9c4a297865abcc458205f5e794e7788 https://doi.org/10.1039/b108679k Zobrazit plný text záznamu