The spectroscopic analysis of di-copper helicates as receptors for encapsulating anions : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Chemistry at Massey University, Palmerston North, New Zealand
The application of neutral dicopper helicates to the encapsulation of a number of anions was investigated. Two dicopper salen derived helicates were studied which contained phenolic and either iminophenyl (1) or oxime (2) donor groups. UV-visible spectroscopy was used to determine the binding stoichiometry and formation constants of the anion complexes. Complex binding was supported by electrospray ionisation mass spectrometry. Receptor 1 possessed a remarkable selectivity for sulfate in isopropanol (IPA) for which a log K value of 5.07 ± 0.24 was obtained. Receptor 2 bound all anions studied more strongly than 1. Crystal structural data supports the proposition that there is a steric barrier to contraction of 1 from the bulky iminophenyl groups. Receptor 2 was not restricted by the small oxime moieties allowing for optimum copper-anion interactions.
Anion complexes, Sulphate, Iminophenyl, Copper-anion interaction
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