Journal
JOURNAL OF LUMINESCENCE
Volume 130, Issue 6, Pages 976-980Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2010.01.008
Keywords
Copper complexes; Photophysical properties; Electrochemical properties; DFT calculations
Categories
Funding
- National Natural Science Foundation of China [20772057, 20773066, 20972068]
- Education Department of Jiangsu Province [CX095_042Z]
- Nanjing Normal University [181200000242]
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Three mononuclear Cu(I) complexes [Cu(bop)(PPh3)(2)][BF4], [Cu(fop)(PPh3)(2)][BF4] and [Cu (pop)(PPh3)(2)][BF4] were synthesized, where 2-(5-tert-butyl-1,3,4-oxadiazol-2-yl)pyridine (bop), 2-(5-(trifluoromethyl)-1,3,4-oxadiazol-2-yl)pyridine (fop) or 2-(5-phenyl-1,3,4-oxadiazol-2-yl)pyridine (pop) was used as N boolean AND N chelate ligand and triphenylphosphine was used as ancillary ligand. Several substituents with different electronic effects, such as tert-butyl (t-Bu), trifluoromethyl (CF3) and phenyl (Ph) groups, were introduced into the 1,3,4-oxadiazole moiety of the N boolean AND N chelate ligands. The photophysical properties of the complexes were examined by UV-vis absorption and photoluminescence (PL) spectroscopies. The complex [Cu(fop)(PPh3)(2)][BF4] with a CF3 group in the N boolean AND N chelate ligand exhibited the lowest energy absorption and emission band. Electrochemical analyses combined with density functional theory (DFT) calculations established that the introduction of electron withdrawing group (CF3) decreases the HOMO-LUMO energy gap, and the introduction of electron donating group (t-Bu) into the 1,3,4-oxadiazole moiety has a similar effect on the emission wavelength as that of the introduction of a phenyl group with a pi-conjugation. (C) 2010 Elsevier B.V. All rights reserved.
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