Fluorescence from upper ππ* electronic states of lanthanide-porphyrin complexes

Investigation of ground and excited state photophysical properties of gadolinium phthalocyanine

“…With such procedure we found f GdPc f ¼ 1:62 Â 10 À4 . Such value is on order of magnitude of the one reported for gadolinium porphyrin [39], for example. Fig.…”

Spectral-luminescent effects in heterometallic complexes of crown-porphyrins

“…The Soret band is [14]. A similarity between the absorption and excitation spectra of the complexes, indicating that ligand-to-lanthanide ion energy transfer from the T-levels of ligands ('antenna chromophore'), which are located at 13 800-14 000 cm À1 , to the resonance 2 F 5/2 -level of Yb(III), which is located at $10 200 cm À1 , takes place [12]. There are no substantial losses of excitation energy in the high excitation states of the porphyrins ring.…”

“…All spectroscopic measurements were carried out at room temperature (25°C) in DMF. The position of ligand triplet (T) levels was obtained from phosphorescence spectra of ligands in complexes with lutetium at 77 K [12]. The lifetimes of luminescence (t) were determined by the least-squares method.…”

Picosecond Spectroscopy: Methods and Recent Applications

“…Learning the role that the chemical environment plays in the involved relaxation mechanisms is crucial to our understanding of these important energy transfer processes. In addition to previous spectroscopic and theoretical studies, (14)(15)(16)(17)(18)(19)(20)(21)(22)(23) picosecond spectroscopy recently has allowed the direct measurement of ultrafast excited-state relaxation rates, has provided absorption spectra of the intermediates, and, in general, has verified and extended our understanding of excited metalloporphyrin relaxation.…”