IRIDIUM CHEMISTRY AND ITS CATALYTIC APPLICATIONS: A BRIEF
AbstractIridium is very important element among the all transition metals with highest reported oxidation state i.e. +9 in gas phase existing species IrO4+. Instead of its less reactivity, it forms number of compounds having oxidation states between -3 to +9. It is second known densest element after osmium. Till now its toxicity and environmental impact is not much more reported and thus it may be use as green element in various fields of its application. Reason behinds it’s less toxicity and environmental impact may be due to its less reactivity and solubility. Corrosion and heat resistant properties of Iridium makes it much more useful element for alloying purpose. Iridium is the member of platinum family and used as catalyst due to its variable oxidation states. Iridium(III) complexes show great catalytic activity in both the acidic and basic medium for various organic as well as inorganic chemical transformations. Catalyst may be defined as the substance which can increases the rate of reaction of a specific chemical reaction without changing its own composition. Iridium is only one reported catalyst which is able to capture the sunlight and convert it into the chemical energy. Thus, it may be used in artificial photosynthesis process to solve our future food problem. Instead of these advantage, Iridium chemistry and its catalytic activity is not much reviewed till date, therefore, present review includes a brief introduction about chemistry and catalytic application of Iridium, which proof itself a boon for beginners to start their research career in the field of Iridium chemistry.
2. Vaska L., Reversible activation of covalent molecules by transition-metal complexes. The role of the covalent molecule, Accounts of Chemical Research 1(11), 1968, 335–344.
3. Wang G.,Zhou M.,Goettel J.T.,Schrobilgen G.J.,Su J.,Li J., Schlöder T. and Riedel S., Identification of an iridium-containing compound with a formal oxidation state of IX, Nature 514, 2014, 475–477.
4. Blaser H.-U., Application of iridium catalysts in the fine chemicals industry in Iridium Complexes in Organic Synthesis, Edited by Oro L.A. and Carmen Claver C., 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
5. Liu Z. and Sadler P.J., Organoiridium complexes: Anticancer agents and catalysts, Accounts of Chemical Research 47, 2014, 1174−1185.
6. Andersson P.G., Iridium Catalysis in Topics in Organometallic Chemistry, 34, 2011, Springer Heidelberg Dordrecht London New York.
7. Oro L.A. and Claver C., Iridium complexes in Organic Synthesis, 2009, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
8. Graetzel M., Artificial photosynthesis: water cleavage into hydrogen and oxygen by visible light, Accounts of Chemical Research 14(12), 1981, 376–384.
9. Rüttinger W. and Dismukes G.C., Synthetic water-oxidation catalysts for artificial photosynthetic water oxidation, Chemical Reviews 97(1), 997, 1–24.
10. Sheehan S.W., Thomsen J.M., Hintermair U., Crabtree R.H., Brudvig G.W. and Schmuttenmaer C.A., A molecular catalyst for water oxidation that binds to metal oxide surfaces, Nature Communications 2015, 6:6469, doi: 10.1038/ncomms7469.
11. Garg K., Matsubara Y., Ertem M.Z., Andralojc A.L., Sato S., Szalda D.J., Muckerman J.T. and Fujita E., Striking differences in properties of geometric isomers of [Ir(tpy)(ppy)H] experimental and computational studies of their hydricities, interaction with CO2, and photochemistry, Angewandte Chemie International Edition, 54(47), 2015,14128-14132.
12. D M., Glezakou V.A., Lebarbier V., Kovarik L., Wan H., Albrecht K.O., Gerber M., Rousseau R. and RA Dagle R.A., Highly active and stable MgAl2O4 supported Rh and Ir catalysts for methane steam reforming: A combined experimental and theoretical study, Journal of Catalysis 316, 2014, 11-23 .
13. Tandon P.K., Mehrotra A., Srivastava M. and Santosh B. Singh S.B., Iridium(III) catalyzed oxidation of iodide ions in aqueous acidic medium, Transition Metal Chemistry 32, 2007, 541-547.
14. Tandon P.K. and Singh S.B., Hexacyanoferrate(III) oxidation of arsenic and its subsequent removal from the spent reaction mixture, Journal of Hazardous Materials 185, 2011, 930–937.
15. Bayram E., Zahmakıran M., Ozkar S. and Richard G. Finke R.G., In situ formed “Weakly Ligated/Labile Ligand” iridium(0) nanoparticles and aggregates as catalysts for the complete hydrogenation of neat benzene at room temperature and mild pressures, Langmuir, 26(14), 2010, 12455–12464.
16. Rueping M., Koenigs R.M., Borrmann R., Zoller J., Weirich T.E. and Mayer J., Size-selective, stabilizer-free, hydrogenolytic synthesis of iridium nanoparticles supported on carbon nanotubes, Chemistry of Materials 23, 2011, 2008–2010.
17. Liu S., Rebros M., Stephens G. and Marr A.C., Adding value to renewables: A one pot process combining microbial cells and hydrogen transfer catalysis to utilise waste glycerol from biodiesel production, Chemical Communications 2009, 2308−2310.
18. Canivet J., Süss-Fink G. and Štěpnička P., Water-soluble phenanthroline complexes of rhodium, iridium and ruthenium for the regeneration of NADH in the enzymatic reduction of ketones. European Journal of Inorganic Chemistry 2007, 4736−474.
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