Cathodically induced time-resolved lanthanide(III) electroluminescence at stationary aluminium disc electrodes
✍ Scribed by J. Kankare; K. Fäldén; S. Kulmala; K. Haapakka
- Book ID
- 102981571
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 810 KB
- Volume
- 256
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A time-resolved electrolummometer, which utilizes electrogenerated luminescence (EL) from disposable oxidecovered aluminium electrodes, is described in detail The cathodic polarization of this disc electrode in aqueous electrolytes induces a faint background EL with peak emission at 570 rim and with a lifetime of 6 µs This cell can be utilized to excite dysprosmm(III), samanum(III) and terbium(III) by electrochemical means to their lowest excited singlet states and, thus, to produce lanthanide(III)-specific emissions From the lanthanide(III) EL systems tested so far, a cathodically induced EL of 2,6-bis[N,N-bis(carboxymethyl)aminomethyl]-4benzoylphenol-chelated terbium(III) with a 2 1-ms lifetime is the longest lived and can be efficiently discriminated against the background EL on a time-resolved basis using instrumentally simple time-resolved detection, this time-resolved terbium(III) EL makes possible the determination of terbium(III) even below the picomole level in aqueous solutions