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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
C.J. Pedersen:,J. Am. Chem. Soc. 89 707 (1967).
J.D. Lamb, R.M. Izatt, J.J. Christensen and D.J. Eatough:Coordination Chemistry of Macrocyclic Compounds (Edited by G.A. Melson) Plenum Press, New York (1979).
G.W. Gokel and S.H. Korzeniowski:Macrocyclic Polyether Synthesis, Springer-Verlag Berlin (1982).
R.M. Izatt, J.S. Bradshaw, S.A. Nielsen, J.D. Lamb, J.J. Christensen, and D. Sen:Chem. Rev. 85, 271 (1985).
H.P. Hopkins, D.V. Jahagirdar, and J.J. Windler:J. Phys. Chem. 82, 1254 (1978).
A.M. Nour El-Din:Spectrochim. Acta 42A, 637 (1986).
A. Semnani and M. Shamsipur:Spectrochim. Acta 49A, 411 (1993).
S.R. Salman and S.M. Al-Marsoumi:Spectrochim. Acta 49A, 435 (1993).
H.A. Benesi and J.H. Hildebrand:J. Am. Chem. Soc. 71, 2703 (1949).
R. Foster:Organic Charge Transfer Complexes, Academic Press (1969).
G. Aloise, S. Santini, and S. Sorrise:J. Chem. Soc. Faraday Trans. 1. 70, 1908 (1974).
A. Cipicani, S. Santini, and G. Savelli:J. Chem. Soc. Faraday Trans. 1. 75, 497 (1979).
J.E. Frey, A. Andrew, D. Anokoviac, D. N. Beaman, L. Dupont, T. Elsner, S. Lang, M.O. Zwarto, R. Seagle, and C. Torreano:J. Org. Chem. 55, 606 (1990).
S. Kashanian and M. Shamsipur:Anal. Chim. Acta 155, 203 (1989).
M.K. Amini and M. Shamsipur:J. Solution Chem. 21, 275 (1992).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Derwish, G.A.W., Salman, S.R. & Al-Marsoumi, S.M.H. Molecular complexes of crown ethers. part 2: Complexes between crown ethers and π acceptors. J Incl Phenom Macrocycl Chem 20, 123–129 (1994). https://doi.org/10.1007/BF00709336
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00709336