Physical Origin of Hydrogen-Adsorption-Induced Metallization of the SiC Surface:n-Type Doping via Formation of Hydrogen Bridge Bond

2005 ◽  
Vol 95 (19) ◽  
Author(s):  
Hao Chang ◽  
Jian Wu ◽  
Bing-Lin Gu ◽  
Feng Liu ◽  
Wenhui Duan
Keyword(s):  
Hydrogen Adsorption ◽  
Hydrogen Bridge ◽  
Physical Origin ◽  
Bridge Bond

scholarly journals A cyclic voltammetric study of the influence of supporting electrolytes on the redox behaviour of Cu(II) in aqueous medium

1970 ◽  
Vol 24 (2) ◽  
pp. 158-164 ◽  
Author(s):  
Aftab Ali Shaikh ◽  
M Badrunnessa ◽  
Jannatul Firdaws ◽  
Md Shahidur Rahman ◽  
Nishat Ahmed Pasha ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Electrochemical Reaction ◽  
Supporting Electrolyte ◽  
Electrode Reaction ◽  
Chemical Society ◽  
Reduction Peak ◽  
Hydrogen Bridge ◽  
Peak Current ◽  
Bridge Bond ◽  
Electrochemical Redox

The electrochemical redox behavior of Cu(II) has been investigated at glassy carbon electrode (GCE) in Britton-Robinson (BR) buffer as well as in a mixture of BR buffer and potassium chloride media. It is apparent that BR buffer can act as a supporting electrolyte and modify the electrochemical behavior of Cu(II) ion in aqueous medium. In BR buffer medium, Cu(II) undergoes one two-electrons redox process, while in a mixture of BR buffer and KCl media it follows two one-electron electrochemical reaction routes. Because of the formation of hydrogen bridge bond between the supporting electrolyte and GCE surface, the Cu(II) ion follows Cu(II)/Cu(0) electrochemical reaction path, while in presence of KCl such a hydrogen bridge bond is not formed and it undergoes successive Cu(II)/Cu(I) and Cu(I)/Cu(0) electrode reaction processes. Moreover, the linear variation of peak current with the square root of scan rate indicates that the electrochemical redox processes are diffusion controlled. Keywords: Supporting electrolytes; Britton-Robinson buffer; Cu-reduction; Peak current DOI: http://dx.doi.org/10.3329/jbcs.v24i2.9704 Journal of Bangladesh Chemical Society, Vol. 24(2), 158-164, 2011

I4N Quadrupole Coupling in the Rotational Spectra of 2,2,2-Trifiuoroethylamine. Isopropylamine, and Aminoethanole

1991 ◽  
Vol 46 (6) ◽  
pp. 527-534 ◽  
Author(s):  
Ch. Keussen ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Hyperfine Structure ◽  
Coupling Constants ◽  
Hydrogen Bridge ◽  
Bridge Bond ◽  
Rotational Spectra ◽  
Distinct Effect ◽  
Coupling Tensor ◽  
Quadrupole Coupling

Abstract We utilized the high resolution of microwave Fourier transform spectroscopy to investigate the 14N-hyperfine structure of trans-2,2,2-trifluoroethylamine, CF3CH2NH2, trans-isopropylamine, CH3CHNH2CH3, and aminoethanole, HOCH2CH2NH2, and the amino deuterated isotopomers trifluoroethylamine-d2 and isopropylamine-d2. The complete coupling tensor of trifluoroethylamine could be determined. We found that the fluorine atoms have a distinct effect on the nitrogen electronic surrounding of the named molecule, presumably through a hydrogen bridge bond between two of these atoms and the amino protons. For isopropylamine and aminoethanole wrong values of the coupling constants known in the literature could be corrected

X-ray and neutron diffraction studies on .lambda.-hydrido-octacarbonyl(nitrosyl)(trimethyl phosphite)ditungsten. A compound with a slightly asymmetric hydrogen bridge bond

1976 ◽  
Vol 98 (15) ◽  
pp. 4491-4498 ◽  
Author(s):  
Richard A. Love ◽  
Henry B. Chin ◽  
Thomas F. Koetzle ◽  
Stephen W. Kirtley ◽  
Bruce R. Whittlesey ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Trimethyl Phosphite ◽  
Hydrogen Bridge ◽  
Bridge Bond ◽  
X Ray

ChemInform Abstract: X-RAY AND NEUTRON DIFFRACTION STUDIES ON Λ-HYDRIDO-OCTACARBONYL(NITROSYL)(TRIMETHYL PHOSPHITE)DITUNGSTEN. A COMPOUND WITH A SLIGHTLY ASYMMETRIC HYDROGEN BRIDGE BOND

1976 ◽  
Vol 7 (42) ◽  
pp. no-no
Author(s):  
RICHARD A. LOVE ◽  
HENRY B. CHIN ◽  
THOMAS F. KOETZLE ◽  
STEPHEN W. KIRTLEY ◽  
BRUCE R. WHITTLESEY ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Trimethyl Phosphite ◽  
Hydrogen Bridge ◽  
Bridge Bond ◽  
X Ray

A two-electron hydrogen bridge bond in crystalline trimethylaluminium dimer

1970 ◽  
pp. 16 ◽  
Author(s):  
Susan K. Byram ◽  
J. K. Fawcett ◽  
S. C. Nyburg ◽  
R. J. O'Brien
Keyword(s):  
Hydrogen Bridge ◽  
Bridge Bond

Homochirality as the Signature of Extra-Terrestrial Life

1997 ◽  
Vol 161 ◽  
pp. 505-510
Author(s):  
Alexandra J. MacDermott ◽  
Laurence D. Barron ◽  
Andrè Brack ◽  
Thomas Buhse ◽  
John R. Cronin ◽  
...  
Keyword(s):  
Amino Acids ◽  
Protein Synthesis ◽  
Optical Rotation ◽  
Physical Origin ◽  
Natural Choice ◽  
Rosetta Mission ◽  
Terrestrial Life ◽  
Subsurface Layers ◽  
Solar System Bodies ◽  
Origin Of Homochirality

AbstractThe most characteristic hallmark of life is its homochirality: all biomolecules are usually of one hand, e.g. on Earth life uses only L-amino acids for protein synthesis and not their D mirror images. We therefore suggest that a search for extra-terrestrial life can be approached as a Search for Extra- Terrestrial Homochirality (SETH). The natural choice for a SETH instrument is optical rotation, and we describe a novel miniaturized space polarimeter, called the SETH Cigar, which could be used to detect optical rotation as the homochiral signature of life on other planets. Moving parts are avoided by replacing the normal rotating polarizer by multiple fixed polarizers at different angles as in the eye of the bee. We believe that homochirality may be found in the subsurface layers on Mars as a relic of extinct life, and on other solar system bodies as a sign of advanced pre-biotic chemistry. We discuss the chiral GC-MS planned for the Roland lander of the Rosetta mission to a comet and conclude with theories of the physical origin of homochirality.

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