Detail of "105-09-9"

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Cyclic control of the surface properties of a monolayer-functionalized electrode by the electrochemical generation of Hg nanoclusters

All Rights Reserved. Cyclic control of the surface properties of a monolayer-functionalized electrode by the electrochemical generation of Hg nanoclusters.Several substances are used for example 7440-57-5 and 105-09-9 which are their cas registry numbers. Riskin, Michael; Basnar, Bernhard; Katz, Eugenii; Willner, Itamar (Inst. Chem. and The Cent. Nanosci. and Nanotechnol., The Hebrew Univ. of Jerusalem, Jerusalem 91904, Israel). Chemistry--A European Journal, 12(33), 8549-8557 (English) 2006 Wiley-VCH Verlag GmbH & Co. KGaA. CODEN: CEUJED. ISSN: 0947-6539. DOCUMENT TYPE: Journal CA Section: 72 (Electrochemistry) Section cross-reference(s): 66 Hg2+ ions are bound to a 1,4-benzenedimethanethiol (BDMT) monolayer assembled on a Au electrode. Electrochem. redn. of the Hg2+-BDMT monolayer to Hg+-BDMT (at E° = 0.48 V) and subsequently to Hg0-BDMT (at E° = 0.2 V) proceeds with electron-transfer rate consts. of 8 and 11 s-1, resp. The Hg0 atoms cluster into aggregates that exhibit dimensions of 30 nm to 2 mm, within a time interval of minutes. Electrochem. oxidn. of the nano-clusters to Hg+ and further oxidn. to Hg2+ ions proceeds with electron-transfer rate consts. corresponding to 9 and 43 s-1, resp., and the redistribution of Hg2+ on the thiolated monolayer occurs within ~15 s. The redn. of the Hg2+ ions to the Hg0 nanoclusters and their reverse electrochem. oxidn. proceed without the dissoln. of Hg species to the electrolyte, implying high affinities of Hg2+, Hg+, and Hg0 to the thiolated monolayer. The electrochem. transformation of the Hg2+-thiolated monolayer to the Hg0-nanocluster-functionalized monolayer is characterized by electrochem. means, surface plasmon resonance (SPR), XPS, SEM, at. force microscopy (AFM), and contact-angle measurements. The Hg0-nanocluster-modified surface reveals enhanced hydrophobicity (contact angle 76°) as compared to the Hg2+-thiolated monolayer (contact angle 57°). The hydrophobic properties of the Hg0-nanocluster-modified electrode are further supported by force measurements employing a hydrophobically modified AFM tip. .

Prediction of increased tunneling current by bond length stretch in molecular break junctions

All Rights Reserved. Prediction of increased tunneling current by bond length stretch in molecular break junctions. Hoft, R. C.; Ford, M. J.; Cortie, M. B. (Institute for Nanoscale Technology, University of Technology, Sydney, Broadway, NSW 2007, Australia). Chemical Physics Letters, 429(4-6), 503-506 (English) 2006 Elsevier B.In this article, certain chemicals are used. Some of their cas registry numbers are 7440-57-5 and 105-09-9 V. CODEN: CHPLBC. ISSN: 0009-2614. DOCUMENT TYPE: Journal CA Section: 76 (Electric Phenomena) Section cross-reference(s): 66 The authors use ab initio calcns. of the tunneling current through a 1,4-phenylenedimethanethiol (XYL) mol. adsorbed between Au(1 1 1) electrodes to show that there are circumstances under which tunneling currents can be increased by bond stretching. The effect is dependent upon the geometry of the Au-S bond and does not occur for the physisorbed thiol, i.e., a thiol with the hydrogen atom still in place. However, the authors predict that when the hydrogen atom is removed, causing the S atom to be strongly bound to the Au surface, stretching this bond away from equil. will actually increase the tunneling current. .