Synthesis of cyclic aza-ether compounds and studies of their use as anion receptors in nonaqueous lithium halide salts solution

Journal Article · Sat Jan 01 04:00:00 EST 2000 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1493856· OSTI ID:20014477

Lee, H S; Sun, X; Yang, X Q; McBreen, J; Callahan, J H; Choi, L S

A series of new anion receptors, based on cyclic aza-ether compounds, have been synthesized. The synthesis and characterization of these compounds are described. In all these cyclic aza-ether compounds, the electron-withdrawing group CF{sub 3}SO{sub 2} was attached to each of the nitrogen atoms. Each member of this class of compounds contains a different number of nitrogen atoms. When used as additives, all of them can significantly increase the ionic conductivity of lithium halide salts in tetrahydrofuran solutions due to the ion-pair dissociation effect. This ion-pair dissociation effect is a results of complexation between these compounds and the halide anions. Ionic conductivity studies show that the complexation behavior is related to both the ring structure of the cyclic compounds and the characteristics of the halide anions. X-ray diffraction data show that the diffraction patterns of the complex crystals grown from cosolution of the cyclic aza-ether compound and lithium halide salts are completely different than those from the pure cyclic aza-ether compounds. New Bragg peaks representing a large d-spacing ({approximately}15 {angstrom}) are observed for the complex crystals. This is clear evidence of the complexation between the cyclic aza-ether compound and halide anions.

• Research Organization: Brookhaven National Lab., Upton, NY (US)
• Sponsoring Organization: US Department of Energy
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 20014477
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 1 Vol. 147; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
ADDITIVES
CRYSTAL STRUCTURE
ELECTROLYTES
ETHERS
IONIC CONDUCTIVITY
METAL-NONMETAL BATTERIES
SYNTHESIS