Chemical vapor deposition of iridium, platinum, rhodium and palladium
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Source characterisation of atmospheric platinum group element deposition into an ombrotrophic peat bog.
Platinum, palladium, rhodium, iridium and osmium were found to be enriched relative to their expected natural concentrations in peat samples from Thoreau's Bog, an ombrotrophic peat bog in Concord, Massachusetts. The source of osmium into the bog was determined from its isotopic composition (187Os/188Os). Osmium is composed of 4% lithogenic osmium from atmospheric soil dust, 41% of anthropogeni...
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A reliable, easily worked process for depositing coherent, compact and pore-free layers of iridium could, when fully developed, be the means of making use as never before of the outstanding and indeed unique characteristics of iridium. Iridium has a very high melting point2443OC-aIId as a platinum group metal it does not scale or tarnish when heated in air even to incandescence. I t is true tha...
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Systematic measurements of the vapor pressure of iridium and rhodium over a wide temperatme range have not been published previously. A summary of previous estimates or observations of their normal boiling points and values of their heats of sublimation, f:..H ~ (298), is given in table l. The vapor pressure of platinum was calculated by Langmuir and .Mackay from measurements of the rate of sub...
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Chloride abstraction, using AgPF6, from tri(1cyclohepta-2,4,6-trienyl)phosphane platinum and palladium dichloride, [P]MCl2 [M = Pt (1), Pd (2)], affords the complexes {[P]MCl}PF6 [M = Pt (3), Pd (4)] in good yields. The central metal is coordinated by the chloro ligand, the phosphorus atom and by three η2-C=C units, one of each C7H7 ring. This assignment of a highly symmetrical C3v structure is...
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Four coordinate tetrahedral (Pd0 and Pt0) and square planar (Rh+ and Ir+) complexes of triphenyl phosphine and 1-benzyl tetrazoline-5-thione have been prepared and characterised on the basis of elemental analysis and spectroscopic data (IR, UV-vis, 1HNMR). Bonding of tetrazole ligand occurs through thione tautometric form. Determination of oxidation state of central metal atom in the complexes ...
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