Ionophoric properties of a tetra-tetrazole functionalised calixarene
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© 2015 Taylor & Francis. The synthesis and characterisation of p-t-butylcalixarene functionalised at the lower rim with four tetrazole moieties is reported. The macrocycle is found to be a poorer ionophore for lanthanoid cations than the bis-tetrazole-substituted analogue. Solution-phase photophysical studies strongly suggested that the cations interacted only weakly with the calixarene ligand. A mixed sodium/triethylammonium salt of the calixarene ligand was crystallised in the presence of lanthanoid cations and structurally characterised. Strong intramolecular interactions are hypothesised to be the cause of the observed behaviour.
This is an Author's Original Manuscript of an article published by Taylor & Francis in Supramolecular Chemistry on 23/10/2015, available online at <a href="http://www.tandfonline.com/10.1080/10610278.2015.1075536">http://www.tandfonline.com/10.1080/10610278.2015.1075536</a>