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New Macrobicycles Containing a Tetralactam Moiety: Template Synthesis and Study of their Binding with Lanthanides

✍ Scribed by Joëlle Azéma; Chantal Galaup; Claude Picard; Pierre Tisnès; Patricia Ramos; Olga Juanes; Juan Carlos Rodrı́guez-Ubis; Ernesto Brunet

Publisher
Elsevier Science
Year
2000
Tongue
French
Weight
235 KB
Volume
56
Category
Article
ISSN
0040-4020

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✦ Synopsis

AbstractÐThe synthesis of macrobicyclic cryptands 1, 2 from an 18-membered diazatetralactam and 6,6 H -bis(bromomethyl)-2,2 Hbipyridine or 2,6-bis(3-bromomethyl-1-pyrazolyl)pyridine has been investigated using various metal carbonates. The analysis of the distribution products by gel permeation chromatography showed that macrocyclization process was markedly conditioned by cation template effects. Optimum yields were obtained for Li 1 and Na 1 in the preparation of 1 and 2, respectively. The cryptate structure of the corresponding complexes of Ln(III) (LnEu, Tb, Gd) is discussed on the basis of spectroscopic and photophysical data.

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