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Title: Dimensionality-property relationships in functional hexahydroxytriphenylene- and cyanide-containing materials
Author: Adamson, Jasper
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2014
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This thesis focuses on materials whose properties are directly linked with the dimensionality of their structures. We utilise diffraction techniques to characterise three systems. The first of these is an organic crystal, 2,3,6,7,10,11-hexahydroxytriphenylene tetrahydrate that contains one-dimensional water channels. These channels are polar and net polarity is achieved at low temperatures. The structure undergoes a phase transition to a non-polar state at higher temperatures. Mapping this finding onto an Ising model is undertaken in this thesis. We also investigate the possibility of transforming the same crystals to an organic metal with oxidation. Furthermore, this work characterises two-dimensional layered structures silver(I) tricyanomethanide and nickel(II) cyanide. We show that the former possesses the unprecedented property of negative area compressibility and the latter shows ordinary compressibility behaviour. Both these structures exhibit area negative thermal expansion. Finally, we investigate copper(II) and cobalt(II) doping into the structure of nickel(II) cyanide and demonstrate that the latter leads to a 10-fold increase in area negative thermal expansion.
Supervisor: Goodwin, Andrew Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Chemical crystallography ; crystallography ; functional materials ; dimensionality