TY - JOUR
T1 - Molecular distortion effect on ff-emission in a Pr(III) complex with 4,7-diphenyl-1,10-phenanthroline
AU - Ishii, Ayumi
AU - Kishi, Shinobu
AU - Ohtsu, Hideki
AU - Iimori, Toshifumi
AU - Nakabayashi, Takakazu
AU - Ohta, Nobuhiro
AU - Tamai, Naoto
AU - Melnik, Milan
AU - Hasegawa, Miki
AU - Shigesato, Yuzo
PY - 2007/6/25
Y1 - 2007/6/25
N2 - The electronic and structural behaviour of a Pr(III) complex with 4,7-diphenyl-1,10-phenanthroline, [PHbathophen)2NO3) 3], is investigated with respect to the effect of configuration changes on the Pr(III) centre. [Pr(bathophen)2(NO3) 3] luminesces from the excited states of the ligand and the metal ion. The fluorescence, ff-emission (1D2→ 3H4), and phosphorescence bands appear at 394, 608.2 and 482 nm, respectively, in the solid state. In acetonitrile, the complex also shows multiple emissions. From the time-resolved emission and the lifetime measurements, the excitation energy-transfer in [Pr(bathophen) 2(NO3)3] is clarified, that is, the upper excited triplet level of the ligand acts as an energy donor, while the 1D2 levels of Pr(III) is the acceptor. Additionally, the emission phenomena of the complex can be modified by molecular distortion, particularly by rotation of the phenyl groups in the ligand.
AB - The electronic and structural behaviour of a Pr(III) complex with 4,7-diphenyl-1,10-phenanthroline, [PHbathophen)2NO3) 3], is investigated with respect to the effect of configuration changes on the Pr(III) centre. [Pr(bathophen)2(NO3) 3] luminesces from the excited states of the ligand and the metal ion. The fluorescence, ff-emission (1D2→ 3H4), and phosphorescence bands appear at 394, 608.2 and 482 nm, respectively, in the solid state. In acetonitrile, the complex also shows multiple emissions. From the time-resolved emission and the lifetime measurements, the excitation energy-transfer in [Pr(bathophen) 2(NO3)3] is clarified, that is, the upper excited triplet level of the ligand acts as an energy donor, while the 1D2 levels of Pr(III) is the acceptor. Additionally, the emission phenomena of the complex can be modified by molecular distortion, particularly by rotation of the phenyl groups in the ligand.
KW - Donor-acceptor systems
KW - Energy transfer
KW - Lanthanides
KW - Ligand effects
KW - Luminescence
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U2 - 10.1002/cphc.200700146
DO - 10.1002/cphc.200700146
M3 - Article
C2 - 17492824
AN - SCOPUS:34447503899
SN - 1439-4235
VL - 8
SP - 1345
EP - 1351
JO - ChemPhysChem
JF - ChemPhysChem
IS - 9
ER -