Journal of the Chemical Society, Dalton Transactions p. 3455 - 3466 (1995)
Update date:2022-08-03
Topics:
Beer, Paul D.
Drew, Michael G. B
Grieve, Alan
Ogden, Mark I.
Reactions of 5,11,17,23-tetra-tert-butyl-25,27-bis(diethylcarbamoylmethoxy)-26,28-dihydroxycalix<4>arene (L) with lanthanide picractes produced 1:1 metal-calixarene complexes incorporating one, two or three picrate moieties, depending on the reaction conditions and the lanthanide used.Dichloromethane solutions of L have been found to extract picric acid (HA) from aqueous solution, resulting in the formation of an L*2HA adduct.Single crystal structure determinations have been carried out on A>*2.5CH2Cl2, a distorted cone conformation in each case.The intense colour of some of these complexes appears to correlate with the disposition of a picrate moiety close to a calixarene phenyl ring, consistent with calixarene->picrate charge-transfer absorption.The UV/VIS spectroscopic studies suggest that at least some aspects of the solid-state structures are maintained in solution.
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(2013)
