Please stop conflating the idea of a "single bond" meaning a bond at one place with a "single bond" meaning a σ bond. The Gold Book is quite clear (and chemistry agrees:) that rotations are in relation to a σ bond, not just a bond. Your latest change confuses all of the ideas: "rotations about single or multiple
bonds" suggests that a multiple bond (alkene) can rotate. Likewise, "Rotamers are conformers that differ by rotation about one only a single bond" would include alkene cis/trans isomerism, since the only one bond (a "single bond") is rotating (the "single" here is redundant with σ, the "one" is not redundant with "single").
DMacks (
talk) 18:56, 29 September 2008 (UTC)
You're right. I made some further changes to clarify it in Conformational isomerism. One problem was that I was trying to clarify that a rotamer is rotation about one sigma bond, a conformation can involve many. A rotamer is a conformer. I did not mean to multiple bonds sound as though it was a higher bond order. There is rotational barrier about a double bond but I don't think people usually call this a rotamer or conformer. It looked as though we were maybe editing the page at the same time on the 29th, which you may have perceived as me changing things back to my wording when yours was more exact. User:Mcpazzo ( talk) 10:51 08-Oct-2008 PDT
I'm sorry but this sentence "The molecular geometry can be determined by various spectroscopic methods ( IR or FRET for distances, Microwave for rotations , NMR for angles and distances) and X-ray crystallography for solids" after your recent edit, contains several errors. Microwave spectroscopy in the gas phase gives distances and angles from the rotational lines. IR gives the same from the rotational fine structure. NMR, as usually done, does not give distances and angles. However solid NMR can do so. FRET does not give structure as far as I know. You miss electron and neutron diffraction and Raman spectroscopy which are all commonly used. I have attempted to rewrite the whole section. -- Bduke (Discussion) 06:32, 9 October 2008 (UTC)
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Thank you. Razor ICE 08:57, 11 October 2008 (UTC)
Hi, I had a question regarding S-Nitrosothiol: is there a difference between Nitrosothiol and S-Nitrosothiol? Does S-Nitrosothiol contain an S-S bond, or why does its deomposition generate a disulfide? Thanks and cheers, AxelBoldt ( talk) 23:33, 25 October 2008 (UTC)
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