title: Tuning the decay time of lanthanide-based near infrared luminescence from micro- to milliseconds through d-->f energy transfer in discrete heterobimetallic complexes.
abstract: Inert and optically active pseudo-octahedral Cr(III)N6 and Ru(II)N6 chromophores have been incorporated by self-assembly into heterobimetallic triple-stranded helicates HHH-[CrLnL3]6+ and HHH-[RuLnL3]5+. The crystal structures of [CrLnL(3)](CF(3)SO(3))(6) (Ln=Nd, Eu, Yb, Lu) and [RuLnL3](CF3SO3)5 (Ln=Eu, Lu) demonstrate that the helical structure can accommodate metal ions of different sizes, without sizeable change in the intermetallic MLn distances. These systems are ideally suited for unravelling the molecular factors affecting the intermetallic nd-->4f communication. Visible irradiation of the Cr(III)N6 and Ru(II)N6 chromophores in HHH-[MLnL3]5/6+ (Ln=Nd, Yb, Er; M=Cr, Ru) eventually produces lanthanide-based near infrared (NIR) emission, after directional energy migration within the complexes. Depending on the kinetic regime associated with each specific d-f pair, the NIR luminescence decay times can be tuned from micro- to milliseconds. The origin of this effect, together with its rational control for programming optical functions in discrete heterobimetallic entities, are discussed.
authors.affiliation: Department of Inorganic, Analytical and Applied Chemistry, University of Geneva, 30 quai E. Ansermet, 1211 Geneva 4, Switzerland.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Torelli
authors.forename: Daniel
authors.initials: D
authors.lastname: Imbert
authors.forename: Martine
authors.initials: M
authors.lastname: Cantuel
authors.forename: Gérald
authors.initials: G
authors.lastname: Bernardinelli
authors.forename: Sandra
authors.initials: S
authors.lastname: Delahaye
authors.forename: Andreas
authors.initials: A
authors.lastname: Hauser
authors.forename: Jean-Claude G
authors.initials: JC
authors.lastname: Bünzli
authors.forename: Claude
authors.initials: C
authors.lastname: Piguet
mesh_terms: D000577:Amides / Q000737:chemistry; D002857:Chromium / Q000737:chemistry; D018360:Crystallography, X-Ray; D007700:Kinetics; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049449:Luminescence; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization; D013056:Spectrophotometry, Ultraviolet; D019265:Spectroscopy, Near-Infrared
chemical_list: D000577:Amides; D028581:Lanthanoid Series Elements; D009942:Organometallic Compounds; D011725:Pyridines; D002857:Chromium