A Bis( p - tert -butyloctahomotetraoxacalix[8]arene) Capsule with [(UO 2 ) 2 (OH) 2 ] Links and a Disordered [Rb 4 (H 2 O) 4 ] Inner Core

Author: Pierre Thuéry  

Publisher: Taylor & Francis Ltd

ISSN: 1061-0278

Source: Supramolecular Chemistry, Vol.16, Iss.2, 2004-03, pp. : 81-86

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Abstract

p-tert-Butyloctahomotetraoxacalix[8]arene (LH

8
) reacts with uranyl nitrate hexahydrate in the presence of rubidium hydroxide to give a mixed complex that can be viewed as a tetrauranate dimer [(UO
2
)
4
(LH
4
)
2
(OH)
4
] containing four disordered rubidium ions and water molecules. Two uranyl ions are complexed in an "external" fashion by each macrocycle, each of them bound to two phenoxide groups and one ether group, as well as to two bridging hydroxide ions. The latter ensure the formation of a dimeric capsule that contains the disordered set of alkali metal ions. Apart from water molecules, the Rb
+
ions are bound to the uranyl oxo groups directed towards the inner cavity, and to phenol and ether oxygen atoms from the macrocycle. The resulting octanuclear complex presents an unprecedented geometry evidencing the assembling potential of uranyl ions.Two partially deprotonated p-tert-butyloctahomotetraoxacalix[8]arene molecules are assembled by two phenoxide- and ether-coordinated [(UO
2
)
2
(OH)
2
] moieties to give a capsular complex that contains four highly disordered rubidium ions and water molecules.

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