A Tetrahomodioxacalix[6]arene as a Ditopic Ligand for Uranyl Ions with Carbonate or Carbamate Bridges |
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Authors: | Bernardo Masci Pierre Thuéry |
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Institution: | 1. Dipartimento di Chimica , Università "La Sapienza" , Box 34 Roma 62 P.le Aldo Moro 5, Roma , 00185 , Italy;2. CEA/Saclay , DSM/DRECAM/SCM , (CNRS URA 331) Bat. 125, Gif-sur-Yvette , 91191 , France |
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Abstract: | The first crystal structures of a p-tert-butyltetrahomodioxacalix6]arene comprising two tri-phenolic subunits separated by two ether bridges and two of its complexes with uranyl ions are reported. The doubly deprotonated macrocycle assumes a much elongated, cone-like conformation including two organic species. Two binuclear uranyl complexes are described. In both, each cation is bound to the three phenoxide oxygen atoms of a tri-phenolic subunit and to a central, bridging, carbonate or carbamate ion. The formation of the latter ions from the amines used as bases is discussed. |
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Keywords: | Uranyl Ion Calixarenes Homooxacalixarenes Crystal Structure |
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