20- and 40-membered macrocyclic mono and dinuclear uranyl complexes 11-13 incorporating salen and (R)-BINOL units have been designed and synthesized starting from 4-tert-butylphenol in eight steps. NMR measurements (COSY, NOESY/EXSY) indicate that such complexes in solution are involved in conformational equilibria, which for the 20- membered derivatives are observable already at room temperature (k(1)=300 s(-1) at 300 K) and which are probably related to a flipping motion of salicylaldehyde units. T-ROESY experiments suggest that in solution, the dinuclear complexes do not assume structures wrapped around the metal ions. (c) 2007 Elsevier Ltd. All rights reserved.
20- and 40-membered macrocyclic mono and dinuclear uranyl complexes 11-13 incorporating salen and (R)-BINOL units have been designed and synthesized starting from 4-tert-butylphenol in eight steps. NMR measurements (COSY, NOESY/EXSY) indicate that such complexes in solution are involved in conformational equilibria, which for the 20- membered derivatives are observable already at room temperature (k(1)=300 s(-1) at 300 K) and which are probably related to a flipping motion of salicylaldehyde units. T-ROESY experiments suggest that in solution, the dinuclear complexes do not assume structures wrapped around the metal ions. (c) 2007 Elsevier Ltd. All rights reserved.
Synthesis and conformational aspects of 20- and 40-membered macrocyclic mono and dinuclear uranyl complexes incorporating salen and (R)-BINOL units
AMATO, Maria Emanuela;BALLISTRERI, Francesco Paolo;PAPPALARDO, ANDREA;SCIOTTO, Domenico;TOMASELLI, Gaetano;TOSCANO, Rosa Maria
2007-01-01
Abstract
20- and 40-membered macrocyclic mono and dinuclear uranyl complexes 11-13 incorporating salen and (R)-BINOL units have been designed and synthesized starting from 4-tert-butylphenol in eight steps. NMR measurements (COSY, NOESY/EXSY) indicate that such complexes in solution are involved in conformational equilibria, which for the 20- membered derivatives are observable already at room temperature (k(1)=300 s(-1) at 300 K) and which are probably related to a flipping motion of salicylaldehyde units. T-ROESY experiments suggest that in solution, the dinuclear complexes do not assume structures wrapped around the metal ions. (c) 2007 Elsevier Ltd. All rights reserved.File | Dimensione | Formato | |
---|---|---|---|
N. 3 - TETRAHEDRON2007.pdf
solo gestori archivio
Tipologia:
Versione Editoriale (PDF)
Licenza:
Non specificato
Dimensione
533.8 kB
Formato
Adobe PDF
|
533.8 kB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.