Browsing by Author "Stevens, James Rawiri"

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The solution and solid state analysis of xylylic di-copper complexes as receptors for encapsulating anions : a thesis presented in partial fulfillment of the requirements for the degree of Master of Science in Chemistry at Massey University, Palmerston North, New Zealand
(Massey University, 2011) Stevens, James Rawiri
The investigation into neutral aryl-linked oxime dicopper helicates encapsulating a number of anions was carried out. Two dicopper aryl-linked salicyloxime derived complexes were synthesized and studied which contained either p-xylylic (1) or m-xylylic (2) incorporated spacer groups. UV-visible spectroscopy was used to determine the binding stability constants of the anion complexes. Complex binding, encapsulation of anions and the conformational flexibility of 1 and 2 was supported and ascertained by the crystal structural data obtained. Receptor 1 expressed an exceptional binding strength for sulfate in THF where a log K value of 5.5 ± 0.3 was acquired. Receptor 2 could form both helical and non-helical structures. This was able to bind bromide selectively in a 2:1 stoichiometry of anion:receptor with a log K2 value of 9.2 ± 0.1 and showed an unexpectedly high association constant for the perchlorate anion in a 1:1 stoichiometry with a log K value of 4.6 ± 0.2 (presumably in a helical structure).