Mcpazzo

Conformational problems

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)

n-Butane has gauche⁺ and gauche^– too. Looking down the C2–C3 bond from either direction gives the same sign: the symmetry is an improper rotation not a plane. DMacks (talk) 19:01, 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

Molecular geometry

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)

Thanks. NMR can give dihedral angles through coupling constants and I was referring to NOE-type experiments to determine relative distance (maybe not very accurately). These things were not discussed before my change, so I am glad you are adding to it. FRET can definitely determine distances. I will find a reference for that when I have the chance. Mcpazzo (talk)Mcpazzo 9:47, 08-Oct-2008

OK. I think there is a lack of clarity between "molecular structure" meaning the linkages and bonds in the molecule and "molecular structure" meaning the determination of the coordinates of all atoms in the molecule, i.e. bond lengths, bond angles and torsion angles. Spectroscopy can give the former in solids and liquids, but the latter comes from the rotational fine structure only really observed in the gas phase. On a different point, your last edits have made several references as self-references. We do not make references to other wikipedia articles. That is against policy. The wikipedia links should be worked into the article text and not into the references. --Bduke (Discussion) 21:22, 9 October 2008 (UTC)

Speedy deletion of ".xyz"

A page you created, .xyz, has been tagged for deletion, as it meets one or more of the criteria for speedy deletion; specifically, it is nonsense or gibberish.

You are welcome to contribute content which complies with our content policies and any applicable inclusion guidelines. However, please do not simply re-create the page with the same content. You may also wish to read our introduction to editing and guide to writing your first article.

Thank you. RazorICE 08:57, 11 October 2008 (UTC)

Question on S-Nitrosothiol

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)

I think a nitrosothiol would be assumed to be an S-nitrosothiol. The 'S' just refers to the site of a thiol that the nitroso group is attached to. The balanced equation is:

2 RSNO → RSSR + 2 NO

I will edit the page to show that- it isn't clear that it isn't "S-nitrosothiol → RSSR + NO"

Mcpazzo (talk) 06:47, 26 October 2008 (UTC)

Speedy deletion of Christopher Spencer Foote

A tag has been placed on Christopher Spencer Foote requesting that it be speedily deleted from Wikipedia. This has been done under section A7 of the criteria for speedy deletion, because the article appears to be about a person or group of people, but it does not indicate how or why the subject is important or significant: that is, why an article about that subject should be included in an encyclopedia. Under the criteria for speedy deletion, such articles may be deleted at any time. Please see the guidelines for what is generally accepted as notable, as well as our subject-specific notability guideline for biographies.

If you think that this notice was placed here in error, you may contest the deletion by adding {{hangon}} to the top of the page that has been nominated for deletion (just below the existing speedy deletion or "db" tag), coupled with adding a note on the talk page explaining your position, but be aware that once tagged for speedy deletion, if the article meets the criterion it may be deleted without delay. Please do not remove the speedy deletion tag yourself, but don't hesitate to add information to the article that would would render it more in conformance with Wikipedia's policies and guidelines. Lastly, please note that if the article does get deleted, you can contact one of these admins to request that they userfy the article or have a copy emailed to you. --Dynaflow babble 05:29, 20 January 2009 (UTC)

ArbCom elections are now open!

Hi,
You appear to be eligible to vote in the current Arbitration Committee election. The Arbitration Committee is the panel of editors responsible for conducting the Wikipedia arbitration process. It has the authority to enact binding solutions for disputes between editors, primarily related to serious behavioural issues that the community has been unable to resolve. This includes the ability to impose site bans, topic bans, editing restrictions, and other measures needed to maintain our editing environment. The arbitration policy describes the Committee's roles and responsibilities in greater detail. If you wish to participate, you are welcome to review the candidates' statements and submit your choices on the voting page. For the Election committee, MediaWiki message delivery (talk) 13:54, 24 November 2015 (UTC)

Women in Red World Contest

Hi. We're into the last five days of the Women in Red World Contest. There's a new bonus prize of $200 worth of books of your choice to win for creating the most new women biographies between 0:00 on the 26th and 23:59 on 30th November. If you've been contributing to the contest, thank you for your support, we've produced over 2000 articles. If you haven't contributed yet, we would appreciate you taking the time to add entries to our articles achievements list by the end of the month. Thank you, and if participating, good luck with the finale!