Relevant bibliographies by topics / OSMIUM COMPLEXES

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'OSMIUM COMPLEXES'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "OSMIUM COMPLEXES"

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BUCHLER, JOHANN W., and JOACHIM R. SIMON. "Metal complexes with tetrapyrrole ligands: Part LXXVII. New osmium complexes of the 5,10,15,20-tetrakis-(4-carboxyphenyl) porphyrin." Journal of Porphyrins and Phthalocyanines 05, no. 06 (June 2001): 500–502. http://dx.doi.org/10.1002/jpp.352.

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The synthesis and characterization of new alkali-soluble osmium tetraphenylporphyrinates, complexes of the 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin Os ( tH 4 cpp ) L 2 and Os ( tH 4 cpp ) LL ' (2a–j), is described. 2a–j are obtained from the corresponding new osmium porphyrinates Os ( tmecpp ) L 2 and Os ( tmecpp ) LL '(1a–k) by alkaline saponification and precipitation with hydrochloric acid. In fact, the osmium(II) porphyrinates 2c–f as well as 2i–j are oxidized to the osmium(III) porphyrinates Os ( tH 3 cpp ) L 2(3c–f) and Os ( tH 3 cpp ) LL '(3i–j) in the presence of air, as confirmed by UV-vis spectroscopy.
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Edwards, Catherine F., and William P. Griffith. "Hydroxycarboxylato oxo-osmium(VI) complexes." Polyhedron 10, no. 1 (January 1991): 61–65. http://dx.doi.org/10.1016/s0277-5387(00)83548-2.

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Wilczewski, Tadeusz. "Cyclopentadienyl-ruthenium and -osmium complexes." Journal of Organometallic Chemistry 306, no. 1 (May 1986): 125–32. http://dx.doi.org/10.1016/s0022-328x(00)98940-x.

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Shapley, Patricia A., Zewdu Gebeyehu, Naijie Zhang, and Scott R. Wilson. "Osmium(VI) complexes of tetrathiotungstate." Inorganic Chemistry 32, no. 25 (December 1993): 5646–51. http://dx.doi.org/10.1021/ic00077a001.

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Coia, George M., Martin Devenney, Peter S. White, Thomas J. Meyer, and David A. Wink. "Osmium Hydrazido and Dinitrogen Complexes." Inorganic Chemistry 36, no. 11 (May 1997): 2341–51. http://dx.doi.org/10.1021/ic961025v.

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Jiang, Xuezhong, Alex K. Y. Jen, Brenden Carlson, and Larry R. Dalton. "Red electrophosphorescence from osmium complexes." Applied Physics Letters 80, no. 5 (February 4, 2002): 713–15. http://dx.doi.org/10.1063/1.1445272.

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Gianino, Jacqueline, Alexander N. Erickson, Sean J. Markovitz, and Seth N. Brown. "High-valent osmium iminoxolene complexes." Dalton Transactions 49, no. 25 (2020): 8504–15. http://dx.doi.org/10.1039/d0dt01735c.

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Umemoto, T., K. Tainaka, K. Tanaka, and A. Okamoto. "Chemistry of Osmium-DNA complexes." Nucleic Acids Symposium Series 51, no. 1 (November 1, 2007): 175–76. http://dx.doi.org/10.1093/nass/nrm088.

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Edwards, Catherine F., William P. Griffith, and David J. Williams. "New thiosulfato complexes of osmium." Journal of the Chemical Society, Dalton Transactions, no. 1 (1992): 145. http://dx.doi.org/10.1039/dt9920000145.

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Wilczewski, Tadeusz. "Cyclopentadienyl-ruthenium and -osmium complexes." Journal of Organometallic Chemistry 376, no. 2-3 (November 1989): 385–96. http://dx.doi.org/10.1016/0022-328x(89)85148-4.

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Dissertations / Theses on the topic "OSMIUM COMPLEXES"

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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 containing nitrogen or nitrogen and oxygen donor atoms (N, NandN, O-chelatingligands) are investigated. It is shown that the chelating ligand has a large effect on the aqueous reactivity of the complexes. The introduction of functional groups on the chelate allowed for the ‘fine-tuning’ of the aqueous reactivity and nucleobase binding of the complexes. Also the nature of the coordinating arene was found to have an important effect on their biological activity. This could be rationalised by increased hydrophobicity with more extended arenes such as biphenylandtetrahydroanthracene, resulting in increased cellular uptake and increased cytotoxicity. Conjugating cell penetrating peptides to the complexes resulted in improved biological properties and opened a new way for functionalisation of the compounds. Several compounds reported in this thesis exhibit promising activity in the ovarian, colon and lung cancer cell lines and some could overcome cisplatin resistance in ovarian cisplatin resistant cell lines. Initial studies revealed cell death via apoptosis and the possible involvement of mitochondria in the apoptotic pathway. These results point to a novel pathway of activation for these complexes which is advantageous for addressing chemoresistance and effectiveness to oher types of cancers. This work shows that the biological properties of these compounds can be tuned by choice of ligands and also provides initial evidence for a novel pathway of activation.
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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 lines. In contrast to the chlorido osmium arene anticancer complexes, the iodido complexes are stable and inert toward aquation. More than thirty half sandwich azopyridine OsII arene complexes [Os(η6- arene)(azopyridine)X]+ (where X is chloride or iodide, the arene is p-cymene or biphenyl and the pyridine ring of azopyridine ligand bearing a variety of substituents) were synthesized and characterized. A preliminary structure activity relationships (SARs) were built up based on the anticancer activity towards A2780 human ovarian cancer cell line. In general, the introduction of an electronwithdrawing group (e.g. F, Cl, Br or I) at specific positions on the pyridine ring significantly increases cytotoxic activity and aqueous solubility. Changing the arene from p-cymene to biphenyl or the monodentate ligand (X) from chloride to iodide resulted in a significant increase in the anticancer activity. Studies in A2780 human ovarian cancer cells suggested that cellular uptake and targeting to cellular organelles play important roles in determining the anticancer activity. According to the 60 cancer cell lines screening results from National Cancer Institute (NCI), the anticancer activity achieved by the most potent OsII arene azopyridine complex is 100 times more than cisplatin; 1000 times activity was found in some cell lines. The mechanism of action may involve the inhibition of tubulin polymerization. One iodido osmium complex was selected for anticancer efficiency evaluation in vivo: [Os(η6-p-cym)(Azpy-NMe2)I]PF6 (FY026). This complex delayed the growth of HCT116 human colon cancer xenografts in mice, with negligible toxicity. It is the first example of in vivo antitumour activity for an organometallic osmium arene complex. Its activity appears to involve redox mechanisms. Its potency towards A2780 ovarian and A549 lung cancer cells is increased significantly when used in combination with L-buthionine-sulfoximine (L-BSO) indicating that L-BSO can be a good candidate for combination therapy treatment with iodido osmium complexes. Further study on the bioisosteres of FY026 was carried out by changing the azo bond (N=N) to imine bond (CH=N). Sixteen osmium arene iminopyridine complexes were synthesized, well characterized and showed good anticancer activity. Different structure-activity relationships comparing iminopyridine complexes with azopyridine complexes were identified which suggested a different anticancer mechanism. In contrast to FY026, [Os(η6-p-cym)(Impy- NMe2)I]PF6 (6) and [Os(η6-p-cym)(Impy-NMe2)Cl]PF6 (14) were found to undergo hydrolysis and the binding was observed between their hydrolyzed product (14A) and 9-ethylguanine. Moreover, a hydride transfer from NADH to form an osmium hydride intermediate which is involved in a catalytic process resulting in the formation of NAD+ was discovered. This process might be involved in the anticancer mechanism of action. A dual mechanism of action was proposed based in the interaction of these compounds with DNA nucleobase and catalytic oxidation of NADH.
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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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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 Os11 arene complexes of the type [(η6-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 pKa of the resulting water is more acidic. Efforts to increase the rates of hydrolysis and the resulting pKa led to replacement of the neutral N,N-chelating ligand by an anionic O,O-chelate. This was successful in that hydrolysis is more rapid and the pKa of the coordinated water has increased by ca 0.8 units. However, these complexes are deactivated by formation of the inert and thermodynamically stable hydroxo-bridged dimers. Attempts to tune the stability of complexes containing XY = O,O-chelate, by replacing the 6-membered O,O-chelate with 5-membered analogues, was partially successful for the development of active complexes, but was unsuccessful in preventing hydroxo-bridged dimer formation. Within the class of N,N- and N,O-chelated complexes the choice of donor group is important. Replacing amine N-donor groups with the Π-acceptor pyridine, reduced both the rate of hydrolysis and pKa or coordinated water, and increased the overall stability of the complex. This was especially the case for complexes containing N,O-chelates, which displayed aqueous chemistry in between that of the parent compounds containing neutral N,N-or anionic O,O-chelates. Within this group of osmium arene complexes, [(η6-arene)Os(N,O)C1], active cytotoxic complexes were obtained, and the first X-ray crystal structures of osmium bound to either G or A nucleobases is reported. This work shows that a wide range of reactivity can be obtained for complexes of the form [(η6-arene)Os(XY)C1]n+ by careful choice of the XY chelating ligand, and this knowledge has allowed complexes with cancer cell cytotoxicity to be designed.
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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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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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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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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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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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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 which ROS levels are elevated inside cells. Firstly I explored Os(II) arene complexes with AZBTZ (phenylazobenzothiazole) bidentate liagnds. It was found that AZBTZ ligands can undergo unaided cyclometallation with Os(II) to form N,C-coordinated osmacycles as well as N,N-coordination. The amount of cyclo-metallation taking place seemed to be dependent on steric factors and occurred more for iodido complexes than chlorido and bromido analogues. The osmacycles were more stable than N,N-coordinated species and exhibited unique properties such as regio-specific deuteration of the aniline ring, but were too hydrophobic for biological evaluation. A total of 31 new Os(II) arene AZPY complexes were synthesised using the previously determined structure-activity relationships as a basis. The majority contained alkoxy and glycolic side chain substituents on the AZPY ligand, which was achieved via a novel synthesis protocol. Their trends in anti-cancer activity, solubility, lipophilicity and cell uptake were explored. It was found that varying the anion was the best method for improving aqueous solubility without affecting activity, lipophilicity or uptake. Key complexes were found to be very active against OE19 oesophageal cancer cells, were capable of inducing apoptosis and elevating ROS levels in A2780 cells, as well as causing cell cycle arrest in different phases of the cell cycle. Complexes [Os(ɳ6-p-cym)(5-EtO-AZPY)I]+ and [Os(ɳ6-p-cym)(AZPY-NMe2)I]+ were labelled with radioisotope 131I (β-/γ emitter, t½ 8.02 d) in Kings College London. They were relatively stable in human blood serum and cell culture medium over 24 h. However, in the presence of MCF-7 cells, rapid dissociation of the iodide monodentate ligand was observed in the supernatants. Cell uptake studies revealed a spike in 131I uptake after 5-10 min, which proceeds to steadily decline. The complexes seemed to undergo intracellular activation involving dissociation of the iodide ligand, and uptake of the complex is in competition with a rapid rate of iodide efflux, probably involving chloride transport channels. The aqua species, [Os(ɳ6-p-cym)(5-EtO-AZPY)H2O]2+, was synthesised and its pKa was determined as 4.55, meaning it exists predominantly as a +1 charged hydroxido species under physiological conditions. Using UV-Vis spectroscopy and EPR (DEPMPO spin trap), [Os(ɳ6-p-cym)(5-EtO-AZPY)OH]+, and its chlorido and iodido analogues were found to catabolise H2O2, generating HO· radicals in the process that were capable of cleaving lysozyme protein with effectiveness in the order OH > Cl > I. Interestingly it was discovered that iodide complexes are activated by iodide ligand dissociation in the presence of low concentrations of GSH (75 μM) to form the more active hydroxido species. However, in higher concentrations (7.5 mM), they formed Os-SG and Os-SOG adducts. Likewise, [Os(ɳ6-p-cym)(5-EtO-AZPY)OH]+ and its iodido analogue were both capable of oxidising NADH to NAD+ with effectiveness in the order OH > I. NADH was also capable of activating iodido species in a similar manner and generating the hydroxido species was required for NADH oxidation to proceed.
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Books on the topic "OSMIUM COMPLEXES"

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Bartucz, Tanya Yolande. The chemistry of some hydride and dihydrogen complexes of rhenium and osmium. Ottawa: National Library of Canada, 1996.

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Maltby, Patricia Anne. Dihydrogen and hydride complexes of osmium (II): synthesis and properties. 1993.

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Maltby, Patricia Anne *. Eta℗ r-dihydrogen complexes of osmium: synthesis and spectroscopic properties. 1988.

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Schlaf, Marcel. Heterolytic activation of the dihydrogen ligand in complexes of ruthenium and osmium. 1996.

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Earl, Kelly Anne. The synthesis and spectroscopic properties of some molecular hydrogen complexes of osmium. 1987.

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Book chapters on the topic "OSMIUM COMPLEXES"

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Roper, W. R. "Carbyne Complexes of Ruthenium and Osmium." In Transition Metal Carbyne Complexes, 155–68. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1666-4_20.

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Bottomley, F., S. B. Tong, R. O. Harris, and N. K. Hota. "Ammine Complexes of Osmium, Including Amminenitrosyls." In Inorganic Syntheses, 9–13. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132470.ch3.

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Gross, Christopher L., Julia L. Brumaghim, Jesse M. Jefferis, Paul W. Dickinson, Gregory S. Girolami, Christopher W. Gribble, and T. Don Tilley. "Mono(η5-Pentamethylcyclopentadienyl) Complexes of Osmium." In Inorganic Syntheses: Volume 36, 72–77. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118744994.ch15.

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Claridge, R. F. C. "1.45 Osmium-centered radicals." In Inorganic Radicals, Metal Complexes and Nonconjugated Carbon Centered Radicals. Part 1, 156–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-48466-0_47.

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Howard, J. A. "2.30 Osmium-centered radicals." In Inorganic Radicals, Metal Complexes and Nonconjugated Carbon Centered Radicals. Part 1, 293–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-48466-0_81.

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Taylor, K. J., and L. J. Yellowlees. "Electrochemical Studies of Coordination Complexes of Osmium." In Molecular Electrochemistry of Inorganic, Bioinorganic and Organometallic Compounds, 69–75. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1628-2_7.

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Stepanenko, Iryna N., Gabriel E. Büchel, Bernhard K. Keppler, and Vladimir B. Arion. "Osmium Complexes with Azole Heterocycles as Potential Antitumor Drugs." In Encyclopedia of Metalloproteins, 1596–614. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-1533-6_391.

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Drudis-Solé, Galí, Gregori Ujaque, Feliu Maseras, and Agustí Lledós. "Enantioselectivity in the Dihydroxylation of Alkenes by Osmium Complexes." In Topics in Organometallic Chemistry, 79–107. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/b104399.

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Hage, R., J. G. Haasnoot, J. Reedijk, and J. G. Vos. "Electrochemistry and Spectroelectrochemistry of Dinuclear Ruthenium and Osmium Complexes." In Molecular Electrochemistry of Inorganic, Bioinorganic and Organometallic Compounds, 583–88. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1628-2_53.

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Roper, W. R. "Stable, Terminal Methylene (=CH2) Complexes of Ruthenium, Osmium and Iridium." In Advances in Metal Carbene Chemistry, 27–41. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2317-1_3.

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Conference papers on the topic "OSMIUM COMPLEXES"

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"The Preparation and Characterisation of Osmium(IV), Osmium(II) and Osmium(0) Complexes from Refinery Materials." In International Conference on Chemical Engineering and Advanced Computational Technologies. International Institute of Engineers, 2014. http://dx.doi.org/10.15242/iie.e1114015.

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Carlson, Brenden, Gregory D. Phelan, Xuezhong Jiang, Werner Kaminsky, Alex K. Y. Jen, and Larry R. Dalton. "Organic light emitting devices based upon divalent osmium complexes: Part 1: design, synthesis, and characterization of osmium complexes." In International Symposium on Optical Science and Technology, edited by Zakya H. Kafafi and Homer Antoniadis. SPIE, 2003. http://dx.doi.org/10.1117/12.451877.

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Ciampi, Simone, Leo M. H. Lai, and J. Justin Gooding. "Silicon (100) surfaces modified by osmium bipyridine complexes." In 2010 International Conference on Nanoscience and Nanotechnology (ICONN). IEEE, 2010. http://dx.doi.org/10.1109/iconn.2010.6045234.

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Carlson, Brenden, Xuezhong Jiang, Alex K. Y. Jen, and Larry R. Dalton. "Organic light-emitting devices based upon divalent osmium complexes: II. Design, fabrication, and characterization of osmium nanoscale devices." In International Symposium on Optical Science and Technology, edited by Guozhong Cao and Wiley P. Kirk. SPIE, 2002. http://dx.doi.org/10.1117/12.453782.

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Carlson, Brenden, Gregory D. Phelan, Joo H. Kim, Alex K. Jen, and Larry Dalton. "Tuned emission from organic light-emitting devices based upon divalent osmium complexes." In Optical Science and Technology, SPIE's 48th Annual Meeting, edited by Zakya H. Kafafi and Paul A. Lane. SPIE, 2004. http://dx.doi.org/10.1117/12.506515.

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Murtaza, Zakir, and Joseph R. Lakowicz. "Long-lifetime and long-wavelength osmium (II) metal complexes containing polypyridine ligands: excellent red fluorescent dyes for biophysics and for sensors." In BiOS '99 International Biomedical Optics Symposium, edited by Joseph R. Lakowicz, Steven A. Soper, and Richard B. Thompson. SPIE, 1999. http://dx.doi.org/10.1117/12.347549.

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Murtaza, Zakir, Henryk M. Malak, and Joseph R. Lakowicz. "DNA dynamics by using highly luminescent phosphine complex of osmium (II)." In BiOS '99 International Biomedical Optics Symposium, edited by Joseph R. Lakowicz, Steven A. Soper, and Richard B. Thompson. SPIE, 1999. http://dx.doi.org/10.1117/12.347550.

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Ajay, Matta, Leroi V. DeSouza, T. C. Lau, and K. W. Michael Siu. "Abstract 2540: Evaluation of novelbis-amidine osmium complex as anti-proliferative agents." In Proceedings: AACR 102nd Annual Meeting 2011‐‐ Apr 2‐6, 2011; Orlando, FL. American Association for Cancer Research, 2011. http://dx.doi.org/10.1158/1538-7445.am2011-2540.

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