Spectral-luminescent effects in heterometallic complexes of crown-porphyrins

✍ Scribed by Yu. Korovin; Z. Zhilina; N. Rusakova; V. Kuz'min; S. Vodzinsky; Yu. Ishkov

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 167 KB
• Volume: 05
• Category: Article
• ISSN: 1088-4246
• DOI: 10.1002/jpp.350

✦ Synopsis

New complexes of ytterbium with porphyrins containing crown- and other oxygen-containing cyclic substituents were obtained. The absorption, excitation, ligand luminescence and 4f-luminescence spectra have been investigated. It has been shown that 4f-luminescence of ytterbium Yb ( III ) ions was a result of the intramolecular energy transfer from the triplet level of the ligands to the resonance ^2^F~5/2~ level of Yb ( III ). It has been also established that in presence of alkali metal Na , K and Cs the dimer complexes (sandwich-type) of ytterbium-crown-porphyrin were formed. Molecular luminescence of the porphyrin matrix was quenched completely in these dimers, but at the same time the quantum yield and lifetime of 4f-luminescence increase in the complexes.