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Molecular Distortion Effect on ff‐Emission in a Pr(III) Complex with 4,7‐Diphenyl‐1,10‐Phenanthroline
Author(s) -
Ishii Ayumi,
Kishi Shinobu,
Ohtsu Hideki,
Iimori Toshifumi,
Nakabayashi Takakazu,
Ohta Nobuhiro,
Tamai Naoto,
Melnik Milan,
Hasegawa Miki,
Shigesato Yuzo
Publication year - 2007
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200700146
Subject(s) - phosphorescence , excited state , chemistry , ligand (biochemistry) , phenanthroline , acceptor , fluorescence , acetonitrile , photochemistry , crystallography , atomic physics , physics , quantum mechanics , biochemistry , receptor , chromatography , condensed matter physics
The electronic and structural behaviour of a Pr(III) complex with 4,7‐diphenyl‐1,10‐phenanthroline, [Pr(bathophen) 2 (NO 3 ) 3 ], is investigated with respect to the effect of configuration changes on the Pr(III) centre. [Pr(bathophen) 2 (NO 3 ) 3 ] luminesces from the excited states of the ligand and the metal ion. The fluorescence, ff‐emission ( 1 D 2 → 3 H 4 ), 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 (NO 3 ) 3 ] is clarified, that is, the upper excited triplet level of the ligand acts as an energy donor, while the 1 D 2 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.