Thesis (M.Sc.)--York University, 2006. Graduate Programme in Chemistry. / Typescript. Includes bibliographical references. Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR29571

Thesis (Ph. D.)--University of Sydney, 2008. / Includes tables. Includes list of publications: leaves i-ii. Title from title screen (viewed October 30, 2008). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Chemistry, Faculty of Science. Includes bibliographical references. Also available in print form.

Thesis (Ph. D.)--University of Hong Kong, 2005. / Title proper from title frame. Also available in printed format.

Universiẗat, Diss., 2006--Würzburg.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1981. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Darmstadt, Techn. Univ., Diss., 2005. / Dateien im PDF-Format

Köln, Universiẗat, Diss., 2001.

Thesis (Ph. D.)--University of Texas at Austin, 2007. / Vita. Includes bibliographical references.

The synthesis of the Ru4O64+(aq) ion and attempts to produce derivative complexes of it are explored. Although crystals suitable for examination by single crystal X-Ray crystallography were not obtained, the core structure of the Ru4Os4+ ion in solution has been successfully determined using Ru K edge EXAFS spectroscopy. The refined results for solutions of the ion in aqueous acid, provide strong indications that the ion has an adamantanoid core arrangement in solution and that core structures based on hydroxo groups i.e Ru4(OH)124+ can be ruled out. Preparation and controlled hydrolysis of a variety of ruthenium precursors aimed at preparing gels of RuO2.nH2O gave at best powders. For example, only RuO2 powders were obtained by raising the pH of solutions of the Ru4O64++ ion. However, gels of a RuO2-TiO2 mixed oxide were readily prepared from the alkoxides. From TGA/DTA, X-Ray, and electron microscopy data these proved to be a mixture of two different oxide phases rather than a solid solution, hi some samples the RuO2 phase contains some of the smallest RuO2 nanoparticles so far reported. The mixed oxide gels and powders obtained were found to contain a number of impurities. Work performed on the iridium aqua ion [Ir(H2O)6]3+ is reported along with experiments to produce mixed IrO2-TiO2 oxides using iridixun ethoxide and iridium acetate complexes as starting materials. The aqua ion was found to give a powder product but gels were obtained from the other two precursors. The gels have been characterized and it was found that IrO2 is highly dispersed within a TiO2 matrix. The electrocatalytic properties of the IrO2 containing gels have been determined by studying the rates of oxygen evolution and the rate of consumption of cerium (IV) ions. The results show that the sol-gel derived IrO2 systems show good activity towards catalysing oxygen evolution by these ions.

OLIVEIRA, A. M.; Síntese, caracterização e estudo de reatividade dos complexos cis-[Ru(bpy)2(TU)(H2O)](PF6)2 E cis-[Ru(bpy)2(TU)(NO)](PF6)3. 2009. 87 f. Dissertação (Mestrado em Química) - Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2009. / Submitted by José Jairo Viana de Sousa (jairo@ufc.br) on 2014-10-17T17:36:53Z No. of bitstreams: 1 2009_dis_amoliveira.pdf: 1628389 bytes, checksum: 456aa15a4312818e1bae8540e4cccae9 (MD5) / Approved for entry into archive by José Jairo Viana de Sousa(jairo@ufc.br) on 2014-10-30T19:05:05Z (GMT) No. of bitstreams: 1 2009_dis_amoliveira.pdf: 1628389 bytes, checksum: 456aa15a4312818e1bae8540e4cccae9 (MD5) / Made available in DSpace on 2014-10-30T19:05:06Z (GMT). No. of bitstreams: 1 2009_dis_amoliveira.pdf: 1628389 bytes, checksum: 456aa15a4312818e1bae8540e4cccae9 (MD5) Previous issue date: 2009 / Neste trabalho foi realizada a síntese e a caracterização dos complexos cis-[Ru(bpy)2(TU)(H2O)](PF6)2 e cis-[Ru(bpy)2(TU)(NO)](PF6)3, onde TU=Tiouréia e bpy= 2,2’-bipiridina, bem como os estudos preliminares relacionados a reatividade do nitrosilo-complexo frente a luz branca e na presença do redutor biológico cisteína. O aquo-complexo possui o ligante Tiouréia coordenado ao centro metálico via átomo de enxofre, tendo em vista os dados obtidos por espectroscopia vibracional na região do infravermelho bem como aqueles calculados por DFT. O complexo apresentou um potencial de meia-onda (E1/2) referente ao par redox RuIII/II em 415 mV vs Ag|AgCl e um espectro eletrônico dependente do pH devido ao equilíbrio de deprotonação do hidrogênio do grupo NH2 da Tiouréia que ocorre com pKa = 10,11. O nitrosilo-complexo, que também possui o ligante Tiouréia coordenado ao centro metálico via átomo de enxofre, apresentou um valor correspondente a frequência de estiramento NO em 1932 cm-1, coerente com o valor do potencial de meia-onda (E1/2) referente ao par redox NO+/0 em 37,5 mV, com o valor obtido para a constante de equilíbrio relacionada a reação de inter-conversão nitrosil-complexo/nitro-complexo, K = 1,26 x 1015, e com os valores calculados por DFT para a energia do orbital LUMO e da carga parcial sobre o ligante nitrosil. O nitrosilo-complexo apresentou uma boa reatividade em relação à liberação de NO0 tanto por redução eletroquímica quanto por redução fotoquímica, porém o mecanismo em que ocorre esta liberação no que se refere à fotoquímica se dá de uma forma diferenciada em relação a sistemas similares da literatura. O mecanismo de liberação do NO0 a partir do nitrosilo-complexo após reação com o redutor biológico cisteína, também parece ocorrer de forma diferenciada em relação a sistemas similares já estudados.