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Lanthanide Picrate Complexes and Picric Acid Adduct of a Calixarene Diamide. Syntheses and Structures of -2),-2)(MeOH)2A>*HA, and L*2HA arene, HA = picric acid>

DOI: 10.1039/DT9950003455

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 3455 - 3466 (1995)

Update date:2022-08-03

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Authors:

Beer, Paul D.Beer, Paul D.

Drew, Michael G. BDrew, Michael G. B

Grieve, AlanGrieve, Alan

Ogden, Mark I.Ogden, Mark I.

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Article abstract of DOI:10.1039/DT9950003455

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 -2)A>*2.5CH2Cl2, -2)(MeOH)2A>*HA*H2O, *2CH2Cl2*1.5H2O and L*2HA*EtOH.The possible variations of these formulae, depending on the charge distribution within the complexes, are discussed.The calixarene is found in 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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Product name:[La(5,11,17,23-tetra-tert-butyl-25,27-bis(diethylcarbamoylmethoxy)-26,28-dioxycalix[4]arene)(methanol)2(picrate)] * picric acid

Cas No:172754-16-4

172754-16-4

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