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71.
Hambourger M Gervaldo M Svedruzic D King PW Gust D Ghirardi M Moore AL Moore TA 《Journal of the American Chemical Society》2008,130(6):2015-2022
The Clostridium acetobutylicum [FeFe]-hydrogenase HydA has been investigated as a hydrogen production catalyst in a photoelectrochemical biofuel cell. Hydrogenase was adsorbed to pyrolytic graphite edge and carbon felt electrodes. Cyclic voltammograms of the immobilized hydrogenase films reveal cathodic proton reduction and anodic hydrogen oxidation, with a catalytic bias toward hydrogen evolution. When corrected for the electrochemically active surface area, the cathodic current densities are similar for both carbon electrodes, and approximately 40% of those obtained with a platinum electrode. The high surface area carbon felt/hydrogenase electrode was subsequently used as the cathode in a photoelectrochemical biofuel cell. Under illumination, this device is able to oxidize a biofuel substrate and reduce protons to hydrogen. Similar photocurrents and hydrogen production rates were observed in the photoelectrochemical biofuel cell using either hydrogenase or platinum cathodes. 相似文献
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74.
Wolf-Walther du Mont Roxana Bîrzoi Delia Bugnariu Constantin G. Daniliuc Christine Goers Rafael Guerrero Gimeno Thorsten Gust Daniela Lungu Antje Riecke Rainer Bartsch Laszlo Nyulászi Zoltan Benkõ Laszlo Könczöl 《Comptes Rendus Chimie》2010,13(8-9):1111-1126
An overview is given on synthesis and structures of new bidentate phosphaalkene ligands [(RMe2Si)2CP]2E (E = O, NR, N?) and (RMe2Si)2CPN(R′)PR′′2. Exceptional properties of these ligands, extending beyond predictable properties of phosphaalkenes are: (i) the NSi bond cleavage of [(iPrMe2Si)2CP]2NSiMe3 with AuI and RhI chloro complexes under mild conditions leading to binuclear complexes of the 6π-delocalised imidobisphosphaalkene anion [(iPrMe2Si)2CP]2N?, and (ii) the chlorotropic formation of molecular 1:2 PdII and PtII metallochloroylid complexes with novel ylid-type ligands [(RMe2Si)2CP(Cl)N(R)PR2]?, and the transformation of a P-platina-P-chloroylid complex into a C-platina phosphaalkene by intramolecular chlorosilane elimination. Properties of the heavier congeners [(RMe2Si)2CP]2E (E = S, Se, Te, PR, P?, As?) and (RMe2Si)2CPEPR′′2 (E = S, Se, Te) are also described. 相似文献
75.
Megiatto JD Patterson D Sherman BD Moore TA Gust D Moore AL 《Chemical communications (Cambridge, England)》2012,48(38):4558-4560
A straightforward procedure based on the formation of intramolecular hydrogen bonds to impart selectivity in the preparation of multi-functionalized porphyrins has been developed. To illustrate the concept, the synthesis of a biomimetic artificial photosynthetic model able to undergo electron and proton transfer reactions upon irradiation is reported. 相似文献
76.
Andréasson J Straight SD Kodis G Park CD Hambourger M Gervaldo M Albinsson B Moore TA Moore AL Gust D 《Journal of the American Chemical Society》2006,128(50):16259-16265
One molecule acts as both an AND and an XOR Boolean logic gate that share the same two photonic inputs. The molecule comprises a half-adder, adding two binary digits with only light as inputs and outputs, and consists of three covalently linked photochromic moieties, a spiropyran and two quinoline-derived dihydroindolizines. The AND function is based on the absorption properties of the molecule, whereas the XOR function is based on an off-on-off response of the fluorescence to the inputs that results from interchromophore excited-state quenching interactions. The half-adder is simple to operate and can be cycled many times. 相似文献
77.
Gust J. A. Artopé 《Analytical and bioanalytical chemistry》1873,12(1):209-209
78.
This paper compares the current knowledge of grain boundary diffusion in three classes of materials: metals and metallic alloys, ordered intermetallic compounds, and ionic stoichiometric and non-stoichiometric compounds. Along with fundamentals, the recent progress in grain boundary diffusion studies in these materials is reviewed. The differences and common features of grain boundary diffusion in these materials are pointed out, and the origin of the differences is examined. It is concluded that, despite many differences, the basic features of grain boundary diffusion in metals, intermetallics and ionics are fairly similar. Those basic features are discussed through the paper, and some prospective topics of future research in the area are suggested. 相似文献
79.
Dr. Uwe Pischel Prof. Dr. Joakim Andréasson Prof. Dr. Devens Gust Vânia F. Pais 《Chemphyschem》2013,14(1):28-46
Information processing at the molecular level is coming of age. Since the first molecular AND gate was proposed about 20 years ago, the molecular interpretation of binary logic has become vastly more sophisticated and complex. However, the field is also at a crossroads. While cleverly designed molecular building blocks are abundant, difficult questions remain. How can molecular components be flexibly assembled into larger circuits, and how can these components communicate with one another. The concept of all‐photonic switching with photochromic supermolecules has shown some interesting potential and is discussed in this review. Although the field of molecular logic was originally discussed mainly in terms of a technology that might compete with solid‐state computers, potential applications have expanded to include clever molecular systems and materials for drug delivery, sensing, probing, encoding, and diagnostics. These upcoming trends, which are herein illustrated by selected examples, deserve general attention. 相似文献