Two Chloride Ions as a Template in the Formation of a Cyclic Hexaurea

Abstract

It takes two to template: A cyclic hexaurea with four xanthene and two diphenyl ether units is predominantly formed by reaction of two diisocyanate molecules with two diamine molecules in the presence of chloride (see picture; green Cl, blue N, red O). The formation of a 1:2 complex with chloride was confirmed by X-ray analysis, solution NMR spectroscopy, and ESI-MS. The complexation constants were determined by microcalorimetry and UV spectrometry. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2006/z503766_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.