Separate peaks in the oxygen-17 NMR spectra of sodium bisulfite solutions provide direct evidence for the existence in solution of two isomers of bisulfite ion: one with the proton bonded to the sulfur atom (HS0 3 -) and the other with the proton bonded to an oxygen atom (so 3 H-). The equilibrium quotient for the isomerization reaction was determined from measurements of peak areas, and was found to be 4.9 ± 0.1 at 298 Kin solutions of ionic strength 1.0 m. The more abundant isomer exchanges oxygen atoms with water more rapidly than does the other, and on this basis is identified tentatively This work was supported ·by the
The adsorption of carbon dimers on carbon nanotubes leads to a rich spectrum of structures and electronic structure modifications. Barriers for the formation of carbon dimer induced defects are calculated and found to be considerably lower than those for the Stone-Wales defect. The electronic states introduced by the ad-dimers depend on defect structure and tube type and size. Multiple carbon ad-dimers provide a route to structural engineering of patterned tubes that may be of interest for nanoelectronics.
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