Molecular complexes of crown ethers. part 2: Complexes between crown ethers and ? acceptors

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1995 English Publisher:Springer Science and Business Media LLCJournal:Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, volume 20, pages 123-129 (issn: 0923-0750, eissn: 1573-1111,

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Authors: Ghazi A. W. Derwish; Salman R. Salman; Sabri M. H. Al-Marsoumi;

doi: 10.1007/bf00709336

Molecular complexes of crown ethers. part 2: Complexes between crown ethers and ? acceptors

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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 whileKc (formation equilibrium constant) increases following the systematic change of the electron affinity of the π acceptors. TheKc values suggest that the phenyl group in CE plays a major role in the formation of a CT complex.

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