Crown ether-lanthanide complexes studied by CPL and Tl. 1. Solution stoichiometry of europium and terbium nitrate complexes of (2R,3R,11R,12R)-2,3,11,12-tetramethyl-18-crown-6
As part of an extensive study of the use of circularly polarized luminescence (CPL) and total luminescence (TL) in probing crown ether-lanthanide interactions in nonaqueous solvents, described here are the results of an anion-exchange experiment designed to elucidate the solution stoichiometry of a chiral crown ether-lanthanide nitrate complex in trifluoroethanol (TFE). Measurements of the CPL and TL spectra of 0.06 M TFE solutions of (2R,3R,11R,12R)-2,3,11,12-tetramethyl-18-crown-6 (I) and either europium(III) or terbium(III) perchlorate in a 1:1 crown ether:lanthanide ratio were made, during the course of a titration with 0.55 M tetraethylammonium nitrate. The TL spectra indicate a 2:1 interaction between the nitrate anions and the lanthanide cation, but it is the CPL spectra that clearly confirm that the NO/sub 3//sup -/ has replaced the ClO/sub 4//sup -/ and/or TFE in the first coordination sphere, leaving the (chiral) crown macrocycle still complexed.
- Research Organization:
- Duke Univ., Durham, NC
- OSTI ID:
- 5622429
- Journal Information:
- Inorg. Chem.; (United States), Vol. 24:4
- Country of Publication:
- United States
- Language:
- English
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ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
EUROPIUM COMPLEXES
LUMINESCENCE
STOICHIOMETRY
POLYETHYLENE GLYCOLS
TERBIUM COMPLEXES
AMMONIUM NITRATES
CHEMICAL REACTIONS
CHIRALITY
EMISSION SPECTRA
ETHANOL
EXPERIMENTAL DATA
ORGANIC FLUORINE COMPOUNDS
SOLUTIONS
ALCOHOLS
AMMONIUM COMPOUNDS
COMPLEXES
DATA
DISPERSIONS
GLYCOLS
HYDROXY COMPOUNDS
INFORMATION
MIXTURES
NITRATES
NITROGEN COMPOUNDS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
POLYMERS
RARE EARTH COMPLEXES
SPECTRA
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)