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Durham e-Theses
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Binding and Detection of Anions Using Tripodal Hosts

TODD, ADAM,MITCHELL (2010) Binding and Detection of Anions Using Tripodal Hosts. Doctoral thesis, Durham University.



The aim of this project was to investigate the anion-binding properties of a range of different receptor compounds. For the most part, the receptors reported here were tripodal in nature, wherein three hydrogen-bonding receptor groups, including amines, amides and ureas, are linked around a common structural core. In this study, a range of different cores were chosen, such as simple and flexible organic frameworks based on the tris(2-aminoethyl)amine (tren) precursor, conformationally-restricted and brightly coloured aromatic species based on the dye pararosaniline, and triply-ligated metal complexes of ruthenium(II).
In order to assess the anion binding abilities of these receptors, a range of different techniques were employed, with 1H-NMR and UV/Visible spectroscopic titrations being the most common. Additionally, the incorporation of fluorescent pyrene moieties as a reporter group to some of the receptors allowed for the probing of anion binding via fluorimetric titrations in these cases.
During the course of the experiments, a number of interesting, and in some cases, unexpected, binding conformations were found – in particular, the interactions between many of the organic receptor compounds with the planar 1,3,5-benzenetricarboxylate (trimesylate) trianion, and the pH dependency of the colour of the pararosaniline-based receptors. Additionally, the range of cyclic thioether-capped ruthenium(II) receptor compounds reported here showed an unusually high resistance to degradation by solvent and guest when compared to similar receptors with aromatic-capped ruthenium, and successfully gave tripodal ML3 complexes instead of the traditionally more stable ML2X dipodal complexes.

Item Type:Thesis (Doctoral)
Award:Doctor of Philosophy
Keywords:Anion Binding, Tripods
Faculty and Department:Faculty of Science > Chemistry, Department of
Thesis Date:2010
Copyright:Copyright of this thesis is held by the author
Deposited On:15 Jun 2010 15:26

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