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Dissertations / Theses on the topic 'Osmium'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Lee, Yui-bing, and 李蕊冰. "The chemistry of osmium-silver and osmium-iridium mixed-metalclusters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40987632.

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2

Lee, Yui-bing. "The chemistry of osmium-silver and osmium-iridium mixed-metal clusters." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B40987632.

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3

Rijt, Sabine H. van. "Osmium arene anticancer complexes." Thesis, University of Warwick, 2010. http://wrap.warwick.ac.uk/3213/.

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Drawbacks associated with anticancer chemotherapeutic cisplatin include tumour drug resistance, non-effectiveness against all tumours and lack of tumour-specificity resulting in severe side-effects (e.g. nausea, hair loss and kidney toxicity). The use of other metals such as transition metals rutheniumandosmium, may address the problems associated with platinum drugs and have received increased interest over the years. In this thesis the biological activity and aqueous solution chemistry of half-sandwichosmium (II) compounds of the type [(arene)OsII(X)(YZ)] n+ is explored. Chelating ligands co

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4

Black, Steven J. "Reactions of osmium clusters." Thesis, University of Edinburgh, 1994. http://hdl.handle.net/1842/14084.

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Previous studies of the ligand properties of primary, secondary and tertiary phosphines on metal monomers have been carried out. These studies investigated the properties of the phosphines in terms of the effects of their basicity and Tolman's cone angle on the metal substrate. The reactions of [Os<SUB>3</SUB>(CO)<SUB>10</SUB>(MeCN)<SUB>2</SUB>] with a series of primary, secondary and tertiary phosphines (PR<SUB>x</SUB>H<SUB>3-x</SUB>) where R = Me, Et, i-Pr, Ph, were studied by variable temperature <SUP>31</SUP>P{<SUP>1</SUP>H}, and <SUP>31</SUP>P nmr. The reactions were monitored by nmr firs

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5

Gosby, Katherine M. P. "Osmium mediated formation of heterocycles." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496899.

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6

Drake, S. R. "High nuclearity clusters of osmium." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233876.

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The work described in this Thesis is a study of the synthesis and reactivity of some giant osmium carbonyl clusters and an investigation into their magnetic and electronic properties. Chapter One contains an overview of the concept of the chemical bond from Dalton to the present day ideas of Wade and Mingos, and their application to transition meial clusters. Chapter Two is an investigation into the fluxional and dynamic behaviour of mixed-metal clusters in solution using multinuclear N.M.R. (lH,iaC, and 3lP{1H}). The clusters [Os10C(CO)24MPR3]-(M = Cu, Ag or Au) and [Os1oC(CO)24(MPR3)(M>PR3)]

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7

Cromhout, Natalie Lyn. "Aspects of osmium cluster chemistry." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627307.

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8

Fu, Ying. "Organometallic osmium arene anticancer complexes." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/52695/.

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The interest in the development of anticancer metal complexes for cancer therapy is growing spurred by the encouraging successful stories of platinum drugs. Osmium arene chlorido complexes had been found to show anticancer activity in vitro. In this thesis, the osmium arene iodido complexes were mainly explored and investigated. It is found that iodido OsII arene complexes with a general structure: [Os(η6- arene)(XY)I]PF6 (XY = p-hydroxy or p-dimethylamino phenylazopyridine, arene = p-cymene or biphenyl) are potently cytotoxic at nanomolar concentrations toward a panel of human cancer cell lin

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9

Lindsay-Scott, Peter J. "New osmium-catalysed routes to heterocycles." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509979.

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10

Birri, Anthony. "Thiopene complexes of ruthenium and osmium." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394242.

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11

Woodhouse, Oliver Brian. "Osmium in seawater : analysis and geochemistry." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284676.

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12

Peacock, Anna F. A. "Design of osmium arene anticancer complexes." Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/15612.

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In this thesis the biological activity and aqueous solution chemistry of half-sandwich Os<sup>11</sup> arene complexes of the type [(η<sup>6</sup>-arene)Os(XY)C1] is explored, and it is demonstrated that these properties can be tuned by careful choice of XY chelating ligand (N,N-, O,O- and N,O-chelates) to achieve cancer cytotoxicity comparable to carboplatin. The osmium complexes containing N,N-chelates hydrolyse more slowly than their ruthenium analogues and the p<i>K</i><sub>a</sub> of the resulting water is more acidic. Efforts to increase the rates of hydrolysis and the resulting p<i>K</i

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13

Cathey, Christopher. "Some studies in osmium cluster chemistry." Thesis, University of Cambridge, 1994. https://www.repository.cam.ac.uk/handle/1810/272644.

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14

Al-Mandhary, Muna R. A. "Aspects of the chemistry of some osmium-containing clusters." Thesis, University of Cambridge, 1994. https://www.repository.cam.ac.uk/handle/1810/272646.

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15

林漢華 and Hon-wah Lam. "Synthesis, reactivities and photochemistry of osmium-nitridocomplexes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1990. http://hub.hku.hk/bib/B31232292.

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16

McQueen, A. Ewan D. "1,1-dithiolate complexes of ruthenium and osmium." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/28608.

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17

Nagra, Harpreet K. "Bromine derivatives of ruthenium and osmium carbonyls." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq24211.pdf.

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18

Lunniss, Julie Amanda. "Organometallic chemistry of some hydrido osmium cluster." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279819.

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19

Chughtai, Majid J. "Development of the osmium mediated aminohydroxylation reaction." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427891.

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20

陳雁菁 and Suzanna Chan. "The chemistry of osmium-palladium carbonyl clusters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31234628.

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21

Champness, Neil Robert. "Studies in ruthenium and osmium coordination chemistry." Thesis, University of Southampton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239648.

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22

Prior, Neville D. "Some organometallic chemistry of osmium carbonyl clusters." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257045.

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23

Massey, Anju Deepali. "Some chemistry of ruthenium and osmium clusters." Thesis, University of Cambridge, 1990. https://www.repository.cam.ac.uk/handle/1810/273135.

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24

Lee, Hui Zhi Shirley. "Organometallic compounds of osmium for cancer therapy." Palaiseau, Ecole polytechnique, 2015. https://tel.archives-ouvertes.fr/tel-01232147/document.

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Cis-platin and its derivatives are the most currently used for cancer treatment. Inspired by these metallodrugs, organometallic compounds (Ti, Ru, Fe, Rh, Au…) have been developed over the years as potential candidates for anticancer drugs, some of these have entered clinical trials. Jaouen and co-workers have developed novel therapeutic agents based on ferrocene compounds analogous to tamoxifen, which show high anti-proliferative effects against two types of breast cancer cells, namely the ER+ breast carcinoma (MCF-7) and the ER- breast carcinoma (MDA-MB-231). Similarly, Leong’s group has fou

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25

Luther, Thomas Alan. "Dicationic dihydrogen complexes of osmium and ruthenium /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/11540.

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26

Chan, Suzanna. "The chemistry of osmium-palladium carbonyl clusters /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18061576.

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27

Geswindt, Theodore Earl. "The reactions of osmium (VIII) in hydroxide medium." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/960.

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Spectrophotometric techniques were used to elucidate the discrepancies surrounding the reduction of osmium tetroxide by several primary alcohols in a hydroxide matrix. In contrast to the documented literature, this reaction was observed to occur in two consecutive reaction steps. Geometrical and computational analysis of kinetic data revealed that the reaction proceeds by the following reaction model: Os(VIII) + RCH2OH Os(VI) + RCHO Os(VIII) + Os(VI) Os2(VII) k1 k+2 k-2 The conditional rate constants and molar extinction coefficients were calculated using custom written software. A hydride tra

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28

Lam, Hon-wah. "Synthesis, reactivities and photochemistry of osmium-nitrido complexes /." [Hong Kong : University of Hong Kong], 1990. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12922444.

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29

Kandala, Srikanth. "Synthesis and characterization of diphosphine ligand substituted osmium and ruthenium clusters." Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc3955/.

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The kinetics for the bridge-to-chelate isomerization of the dppe ligand in H4Ru4(CO)10(dppe) have been investigated by UV-vis and NMR spectroscopies over the temperature range of 308-328 K. The isomerization of the ligand-bridged cluster 1,2-H4Ru4(CO)10(dppe) was found to be reversible by 31P NMR spectroscopy, affording a Keq = 15.7 at 323 K in favor of the chelating dppe isomer. The forward (k1) and reverse (k-1) first-order rate constants for the reaction have been measured in different solvents and in the presence of ligand trapping agents (CO and PPh3). On the basis of the activation pa

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30

鍾偉祥 and Wai-cheung Chung. "Syntheses, characterization and reactivities of some high-valent osmium porphyrin complexes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B31230817.

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31

鄭永堅 and Wing-kin Cheng. "Synthesis, reactivities, and electrochemistry of osmium complexes withmacrocyclic tertiary amine and multianionic amide and schiff-baseligands." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31231512.

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32

Cheng, Wing-kin. "Synthesis, reactivities, and electrochemistry of osmium complexes with macrocyclic tertiary amine and multianionic amide and schiff-base ligands /." [Hong Kong : University of Hong Kong], 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12374118.

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33

Khattar, Rajesh. "Aspects of organometallic chemistry of some osmium clusters." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328690.

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34

Clarke, L. P. "The chemistry of osmium and ruthenium diyne clusters." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597722.

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The work describes in this dissertation concerns the syntheses, reactivities and characterisation of some triosmium and tetraruthenium carbonyl clusters with conjugatively unsaturated diynes. While the alkyne chemistry of osmium and ruthenium carbonyl clusters has been explored extensively over the past 20 years, the analogous chemistry of diynes has been less thoroughly explored. Chapter 1 gives a general introduction to the area of carbonyl clusters and their alkyne derivatives in chapter 1, with an emphasis on the group 8 transition metals. Recent and related diyne work is also discussed. T

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35

Alyoubi, A. R. O. "Nuclear magnetic resonance studies of some osmium complexes." Thesis, University of Essex, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373208.

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36

Osman, Robert. "Photochemistry of polyphosphine complexes of Ruthenium and Osmium." Thesis, University of York, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358621.

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37

Stavropoulos, P. "Oxo alkyls and aryls rhenium, tungsten and osmium." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37866.

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38

Martin, James Neville. "The chemistry of osmium clusters with unsaturated ligands." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620211.

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39

Brown, Alisdair James. "Functionalised transition metal clusters of cobalt and osmium." Thesis, University of Edinburgh, 1995. http://hdl.handle.net/1842/12847.

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In Chapter One, a review of the chemistry of the tricobalt nonacarbonyl methylidyne cluster is presented. The concept of organic polymeric species containing inorganic moieties is introduced and methods of synthesis and characterisation are discussed. The importance of these compounds as potentially homogenised heterogeneous catalysts is highlighted, and some examples of these species are given. Finally, the catalytic cross linking of alkyd polymers is considered. In the second chapter, the synthesis and characterisation of some tricobalt clusters and their derivatives is presented. Reaction o

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40

Bryce, Garry Thomas. "Palladium acylation catalysts and osmium cluster arene complexes." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/15491.

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The acyl palladium complex (bpy)Pd(COMe)(I) (bpy = 2,2'-bipyridyl) was synthesised, and reacted with a variety of different alkenes, cyclic alkenes and dienes, and arenes in an attempt to yield the inserted acyl complexes {(bpy)Pd(C<SUB>x</SUB>R<SUB>Y</SUB>COMe)}. The inserted complexes were the first stage in setting up a catalytic reaction with the Palladium complex acting as a catalyst in the synthesis of an acylated arene. The osmium cluster Os<SUB>3</SUB>(CO)<SUB>10</SUB>(NCMe)<SUB>2</SUB>, was reacted with a series of functionalised arenes of the type C<SUB>6</SUB>H<SUB>4</SUB>R<SUP>1</S

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41

Needham, Russell James. "Organo-osmium anticancer complexes with novel azo-ligands." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/88273/.

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Piano-stool iodido Os(II) arene complexes containing AZPY (phenylazopyridine) π-acceptor bidentate ligands have been previously shown to exhibit potent anticancer activity and mechanisms of action that involve ROS generation, and differ greatly from early Os(II) arene complexes baring σ-donor bidentate ligands. The aim of this thesis was to explore Os(II) complexes containing other types of azo-ligands as well as continue our studies into AZPY complexes. Develop methods for improving the solubility of complexes, explore their intracellular activation, and further understand the mechanisms in w

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42

Amoroso, Angelo James. "The synthesis and reactivity of osmium carbonyl clusters." Thesis, University of Cambridge, 1993. https://www.repository.cam.ac.uk/handle/1810/272544.

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43

Morewood, Catherine Alexandra. "π-complexes of osmium and ruthenium organometallic clusters". Thesis, University of Cambridge, 1995. https://www.repository.cam.ac.uk/handle/1810/272792.

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44

Buntem, Radchada. "Synthetic studies in carbonyl cluster compounds of osmium." Thesis, University of Cambridge, 1995. https://www.repository.cam.ac.uk/handle/1810/271933.

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45

Mathur, Ryan Dilip. "Rhenium-osmium isotopes of base metal porphyry deposits." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/289216.

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This study uses Re-Os isotopes from sulfide minerals (molybdenite, pyrite, chalcopyrite, bornite, sphalerite, arsenopyrite, and galena) and magnetite from high (400-500°C) and low and low ( < 300°C) temperature mineralization assemblages associated with the intrusion of igneous rocks to trace the source of Os and by inference the other metals. The source of Os is used as a proxy for the source of copper and gold in these systems. Concentrations of Re-Os for all sulfides except molybdenite in various deposit types vary from 0.005-2 ppb Os and 0.120-500 ppb Re. Initial ¹⁸⁷Os/¹⁸⁸Os ratios derived

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46

梁士賢 and Sze-yin Leung. "The chemistry of hexa- and hepta- osmium carbonyl clusters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31238877.

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47

Leung, Sze-yin. "The chemistry of hexa- and hepta- osmium carbonyl clusters /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20978765.

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48

Mace, J. M. "Nitrosyl, nitrido and sulphido clusters of ruthenium and osmium." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354344.

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49

洪若華 and Yeuk-wah Hung. "The chemistry of Osmium-Rhodium mixed-metal carbonyl clusters." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B3121535X.

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50

LaPointe, Anne Marie. "Alkyl, alkylidene, and alkylidyne complexes of rhenium and osmium." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11762.

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