Halide Recognition through Diagnostic “Anion–π” Interactions: Molecular Complexes of Cl⁻, Br⁻, and I⁻ with Olefinic and Aromatic π Receptors

Abstract

Intense colorations and new charge-transfer absorption bands are observed upon addition of a halide (Cl−, Br−, I−) to neutral organic π acceptors with electron-deficient olefinic and aromatic centers. These phenomena results from noncovalent anion–π interactions (shown schematically), which were confirmed by X-ray crystallography. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2004/z460337_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.