Coordination properties of a diarylaza crown ether appended with a luminescent [Ru(bipy)3]2+ unit.
The [Ru(bipy)(2)(1)](PF(6))(2) (bipy refers to 2,2'-bipyridine) complex, comprising a ruthenium(II) tris(2,2'-bipyridine) luminophore covalently linked to a di[(o-triethyleneglycoxy)phenyl]amine crown ether 1, has been synthesized and fully characterized. The photophysical properties of this metal complex have been examined in solution at ambient temperature. Luminescence from the metal complex is enhanced significantly in the presence of various adventitious cations, including protons. In particular, Li(+) cations bind to the crown ether, as evidenced by (1)H NMR and luminescence spectroscopy. Cation binding serves to decrease the rate of reductive quenching of the triplet state of the metal complex, thereby increasing the extent of luminescence. The solution-phase conformation of [Ru(bipy)(2)(1)](PF(6))(2), with and without encapsulated Li(+), has been examined by 2-D NMR and by molecular dynamics simulations.
Charbonnière
Loïc J
LJ
Laboratoire de Chimie Moléculaire, UMR 7008 au CNRS, Ecole de Chimie, Polymère et Matériaux, 25, rue Becquerel, 67087 Strasbourg, Cedex 02, France. ziesel@chimie.u-strasbg.fr
Ziessel
Raymond F
RF
Sams
Craig A
CA
Harriman
Anthony
A