Thesis (Ph. D.)--University of Adelaide, Dept. of Physical and Inorganic Chemistry, 1989. / Includes bibliographical references (leaves 178-186).

Thesis (Ph. D.)--University of Canterbury, 2008. / Typescript (photocopy). Includes bibliographical references (p. 204-220). Also available via the World Wide Web.

Thesis (Ph.D.) - Carleton University, 2005. / Includes bibliographical references. Also available in electronic format on the Internet.

Regensburg, University, Diss., 2004.

Techn. Universiẗat, Diss., 1999--Freiberg (Sachsen).

Techn. Universiẗat, Diss., 2005--Darmstadt.

No description available.

Inhibiting the formation of ice is an essential process commercially, industrially, and medically. Compounds that work to stop the formation of ice have historically possessed drawbacks such as toxicity or prohibitively high active concentrations. One class of molecules, ice recrystallization inhibitors, work to reduce the damage caused by the combination of small ice crystals into larger ones. Recent advances made by the Ben lab have identified small molecule carbohydrate analogues that are highly active in the field of ice recrystallization and have potential in the cryopreservation of living tissue. A similar class of molecules, kinetic hydrate inhibitors, work to prevent the formation of another type of ice – gas hydrate. Gas hydrates are formed by the encapsulation of a molecule of a hydrocarbon inside a growing ice crystal. These compounds become problematic in high pressure and low temperature areas where methane is present - such as an oil pipeline. A recent study has highlighted the effects of antifreeze glycoprotein, a biological ice recrystallization inhibitor, in the inhibition of methane clathrates. Connecting these two fields through the synthesis and testing of small molecule ice recrystallization inhibitors in the inhibition of methane hydrates is unprecedented and may lead to a novel class of compounds.

This thesis discusses in general terms the theory and application of time-differential perturbed angular correlation gamma-ray spectroscopy (TDPAC) to the study of solid state physics. The technique yields valuable information on the electric field gradients experienced by radionuclides which have been substituted for nonradioactive isotopes or inserted as impurities into various inorganic compounds. The indium halides are examined in a series of experiments. The first applications of this technique to the study of graphite intercalation compounds are discussed. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

This work is predominantly devoted to the 4-phenylpyridine ligand and the role that it plays in the formation of a series of inorganic coordination complexes termed Werner Clathrates. The synthesis and characterization by single crystal X-ray diffraction techniques are reported for 18 structures, the majority of which, upon crystallization, have the ability to include solvent or guest molecules within the host framework. The compounds are divided into four broad classes with the host complex of each as follows: Class A [Ni(NCS)₂(4-PhPy)₄]; Class B [NiCl₂(4-PhPy)₄]; Class c [Ni(NCS)₂(4-MePy)₂(4-PhPy)₂]; Class D [NiX₂(dmso)₂(4-PhPy)₂] where X= Ncs- or Cland [Ni(NCS)₂(4-RPy)₄] where R = 4-t-Bu or 4-Bz. The guest molecules, anionic ligand and substituent on the pyridine ligand have all been varied to try to establish the role that they each play in the formation of a structure. Much effort has been spent on the location and refinement of disordered guest molecules. Use has been made of statistical disorder and molecular scattering factors to try and successfully model these guests. The shapes of the cavities containing the guest molecules have been mapped by volume calculations and comparisons made between the packing of the compounds. Several of the complexes pack in space groups which are subsets of others and attempts have been made to determine the cause of the reduction in symmetry. A new technique to analyze competition experiments, with two guest solvents competing for occupation of the voids within the host lattice, has been established. Preliminary results for competition between p-xylene/benzene, p-xylene/toluene and p-xylene/ethylbenzene with the host complex [Ni(NCS)₂(4-ViPy)₄] are reported. The ability of the host complex [Ni(NCS)₂(4-MePy)₂(4-PhPy)₂] to separate a series of straight chain alcohols is demonstrated. The preference, by this host complex, for guest molecules containing a linear skeleton of 5 non-hydrogen atoms, is explained in terms of potential energy and residual volume calculations. Thermal analysis, consisting of thermogravimetry and differential thermal analysis, has been performed on several of the compounds. Temperatures of guest release, host decomposition and the enthalpies involved at each of these steps are reported.