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Platinum
About: Platinum is a research topic. Over the lifetime, 49675 publications have been published within this topic receiving 1150035 citations. The topic is also known as: Pt & element 78.
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184 citations
TL;DR: It appears that the electron-rich arylacetylide ligands, especially 4-methoxyphenyl acetylide and 4-dimethylaminophenylacetylides, cause a decrease of the emission efficiency and disappearance of the transient absorption, and the complexes that exhibit positive absorption bands in the visible spectral region of the triplet transient difference absorption spectra show substantial optical limiting for nanosecond laser pulses at 532 nm.
Abstract: A series of 4‘-tolylterpyridyl platinum(II) complexes with different arylacetylide ligands, namely, phenylacetylide, 4-bromophenylacetylide, 4-nitrophenylacetylide, 4-methoxyphenylacetylide, 4-dimethylaminophenylacetylide, 1-naphthylacetylide, and 3-quinolinylacetylide, were synthesized. Their photophysical properties, such as electronic absorption spectra, emission characteristics at room temperature and 77 K, and transient difference absorption spectra, have been investigated. All of these complexes exhibit a metal-to-ligand charge-transfer (1MLCT) transition at ca. 420−430 nm in their electronic absorption spectra. For ttpy-Ph, ttpy-C6H4Br-4, ttpy-C6H4OCH3-4, ttpy-C6H4N(CH3)2-4, and ttpy-Np, an additional solvatochromic charge-transfer band appears at ca. 460−540 nm. This band is sensitive to the para substituents on the phenylacetylide ligand and is tentatively assigned to a metal- or/and acetylide-to-terpyridyl charge-transfer transition (i.e., a 1MLCT or/and 1LLCT transition). All of the complexes e...
184 citations
TL;DR: The first enzyme-based catalyst that is superior to platinum in the four-electron electroreduction of oxygen to water is reported, and it is reported that the smooth Pt cathode reached half and 90% of the mass transport-limited current density at respective overpotentials.
Abstract: The first enzyme-based catalyst that is superior to platinum in the four-electron electroreduction of oxygen to water is reported. The smooth Pt cathode reached half and 90% of the mass transport-limited current density at respective overpotentials of −0.4 and −0.58 V in 0.5 M sulfuric acid, and only at even higher overpotentials in pH 7.2 phosphate buffer. In contrast, the smooth “wired” bilirubin oxidase cathode reached half and 90% of the mass transport-limited current density at respective overpotentials as low as −0.2 and −0.25 V. The mass transport-limited current density for the smooth “wired” enzyme cathode in PBS was twice that with smooth Pt in 0.5 M sulfuric acid. Under 1 atm O2 pressure, O2 was electroreduced to water on a polished carbon cathode, coated with the “wired” BOD film, in pH 7.2 saline buffer (PBS) at an overpotential of −0.31 V at a current density of 9.5 mA cm-2. At the same overpotential, the current density of the polished platinum cathode in 0.5 M H2SO4 was 16-fold lower, only...
184 citations
Patent•
26 Oct 2009TL;DR: In this paper, a process for the selective formation of ethanol from acetic acid is described, where a feed stream containing hydrogen at an elevated temperature with catalyst comprising platinum and tin on a high surface area silica promoted with calcium metasilicate.
Abstract: A process for selective formation of ethanol from acetic acid includes contacting a feed stream containing acetic acid and hydrogen at an elevated temperature with catalyst comprising platinum and tin on a high surface area silica promoted with calcium metasilicate Selectivities to ethanol of over 85% are achieved at 280° C with catalyst life in the hundreds of hours
184 citations
TL;DR: In this paper, the preferential CO oxidation (PROX) in the presence of hydrogen over Pt/CexZrx−1O2 (x=0, 0.15,0.5,0.68, 1) catalysts was investigated and a comparison with results observed on a Pt/Al2O3 catalyst was made.
184 citations