ISSN:
1573-1111
Keywords:
Intermolecular charge transfer
;
crown ethers
;
π acceptors
;
formation constant
;
UV-visible spectra
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The intermolecular charge transfer (CT) complexes of four crown ethers (CE), viz. B15C5, B18C6, DB18C6 and DB24C8 (as donors), and three acceptors, i.e. tetracyanoethylene (TCNE) 7,7,8,8-tetracyanoquinodimethane (TCNQ) and chloranil were studied in the UV-Visible region in 1,2-dichloroethane (DCE) at 298.2 K. Solid complexes were also prepared and the ratio of the donor to the acceptor was 1:1. Results indicate that the λmax of the CT band decreases whileK c (formation equilibrium constant) increases following the systematic change of the electron affinity of the π acceptors. TheK c values suggest that the phenyl group in CE plays a major role in the formation of a CT complex.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00709336
Permalink