New dioxadiaza-, trioxadiaza- and hexaaza-macrocycles containing dibenzofuran units

resumo

New dioxadiaza-, trioxadiaza-, and hexaaza-macrocycles containing rigid dibenzofuran groups (DBF) were prepared by a convenient synthetic route in high yields. The structures of the macrocycles were unequivocally established by electrospray mass spectrometry (ESIMS) studies together with NMR spectroscopy, with the exception of [14](DBF)N-3. The structures of the copper complex of [14](DBF)N-3 and of the diprotonated form of [22](DBF)N2O3 were determined by single crystal X-ray diffraction. Conformational analyses on the free macrocycles [14](DBF)N-3 and [22](DBF)N2O3 as well as on their larger counterparts containing two DBF units were undertaken in order to understand the synthetic findings. (c) 2006 Elsevier Ltd. All rights reserved.

palavras-chave

CAMBRIDGE STRUCTURAL DATABASE; CRYSTAL-STRUCTURES; MOLECULAR CLEFTS; AQUA COMPLEXES; RECEPTORS; ANIONS; GUEST; WATER; ACIDS

categoria

Chemistry

autores

Li, F; Delgado, R; Coelho, A; Drew, MGB; Felix, V

nossos autores

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