Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 3, Issue 6, Pages 1013-1024Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b418964g
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The synthesis and photophysical characterisation are reported of a series of cationic, neutral and anionic europium and terbium complexes based on structurally related, nonadentate ligands based on the cyclen macrocycle. Each complex incorporates a tetraazatriphenylene moiety and overall absolute emission quantum yields are in the range 15 - 40% in aerated aqueous media. Dynamic quenching of the lanthanide excited state occurs with electron-rich donors, e. g. iodide, ascorbate and urate, and a mechanistic interpretation is put forward involving an electron transfer process. The cationic lanthanide complexes are taken up by N1H/ 3T3 cells and tend to localise inside the cell nucleus.
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