Metal-directed synthesis of enantiomerially pure dimetallic lanthanide luminescent triple-stranded helicates.
The synthesis and photophysical evaluation of two enatiomerially pure dimetallic lanthanide luminescent triple-stranded helicates is described. The two systems, formed from the chiral (R,R) ligand 1 and (S,S) ligand 2, were produced as single species in solution, where the excitation of either the naphthalene antennae or the pyridiyl units gave rise to Eu(III) emission in a variety of solvents. Excitation of the antennae also gave rise to circularly polarized Eu(III) luminescence emissions for Eu(2):1(3) and Eu(2):2(3) that were of equal intensity and opposite sign, confirming their enantiomeric nature in solution providing a basis upon which we were able to assign the absolute configurations of Eu(2):1(3) and Eu(2):2(3).
Stomeo
Floriana
F
School of Chemistry, Center for Synthesis and Chemical Biology, Trinity College Dublin, Dublin 2, Ireland.
Lincheneau
Christophe
C
Leonard
Joseph P
JP
O'Brien
John E
JE
Peacock
Robert D
RD
McCoy
Colin P
CP
Gunnlaugsson
Thorfinnur
T
D005063:Europium / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008024:Ligands; D049449:Luminescence; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D008968:Molecular Conformation; D009281:Naphthalenes / Q000737:chemistry; D013237:Stereoisomerism
D028581:Lanthanoid Series Elements; D008024:Ligands; D009281:Naphthalenes; C031721:naphthalene; D005063:Europium; D006046:Gold