Sensitized near-IR luminescence of lanthanide complexes based on push-pull diketone derivatives.
Lanthanide complexes with two push-pull diketone derivatives as sensitizers have been developed as synthons for near-infrared emitting materials. The ligand substituents consist of a carbazole moiety with hole-transport properties and an aromatic or heteroaromatic unit. According to quantitative NMR analysis and complementary HPLC experiments, the diketones are predominantly in their enolic form in polar solvents such as THF and MeCN at room temperature. The preferred cis-enol form contributes strongly to the binding of lanthanide ions (Ln = Nd, Gd, Er). The resulting tris(diketonate) ternary complexes with terpyridine (Ln = Nd, Er) display sizeable near-IR emission with long luminescence lifetimes.
Baek
Nam Seob
NS
IT Convergence Technology Research Laboratory, Electronics and Telecommunications Research Institute (ETRI), Daejeon, 305-700, Korea.
Kim
Yong Hee
YH
Eom
Yu Kyung
YK
Oh
Jung Hwan
JH
Kim
Hwan Kyu
HK
Aebischer
Annina
A
Gumy
Frédéric
F
Chauvin
Anne-Sophie
AS
Bünzli
Jean-Claude G
JC
D056831:Coordination Complexes / Q000737:chemistry*; D007659:Ketones / Q000737:chemistry*; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008024:Ligands; D049449:Luminescence; D009682:Magnetic Resonance Spectroscopy; D019265:Spectroscopy, Near-Infrared
D056831:Coordination Complexes; D007659:Ketones; D028581:Lanthanoid Series Elements; D008024:Ligands