Talk:Metallocene

Proposal to rename "metallocene" as "sandwich" - also half sandwich

"In chemistry, and in particular, in organometallic chemistry, a metallocene is a compound with the general formula (C5R5)2M consisting of two cyclopentadienyl anions (Cp) bound to a metal center in the oxidation state II." HappyCamper pointed out that Uranocene would appear to be a metallocene based on its name alone. Not M(II) and not Cp₂M. How about this suggestion: we rename this article "sandwich compound" and describe Cp₂M's, uranocene, and other compounds where a metal is sandwiched between two planar hydrocarbons. Thus Cr(C₆H₆)₂ would be included. But also CpTi(η⁷-C₇H₇). When the hydrocarbon is not flat, these would be excluded but mentioned, thus [Ru(η⁶-C₆Me₆)₂]²⁺ would be included, but [Ru(η⁶-C₆Me₆)(η⁴-C₆Me₆)] would not, but we could mention this gray area? Now that we are on the subject, we should probably have a Half sandwich article. This label is preferable to piano stool where we will be confronted with the number of legs on such a piano stool: CpV(CO)₄? CpCo(CO)₂?--Smokefoot 03:58, 24 July 2006 (UTC)

I counter the renaming proposal: The IUPAC article mentioned in the sources of the article states: "Consequently, the name-ending -ocene should be con®ned to molecules of the form bis(h5-cyclopentadienyl)metal, where the metal is in the d-block [i.e. the terminology does not apply to compounds of the s or p-block elements such as Ba(C5H5)2 or Sn(C5H5)2], and where the rings are essentially coplanar to each other." Thus uranocene is strictly speaking not a metallocene. Instead of changing the name of the article I would include uranocene in the section, where it is pointed out, that in contrast to the stricter IUPAC nomenclature the term metallocene have been applied to non-transition metals (Cp2Ba), non-sandwich compounds (Cp2TiCl2). We can add here "also to non-planar metal complexes with more than two Cp rings, such as Cp3U".

External links modified (January 2018)

Hello fellow Wikipedians,

I have just modified one external link on Metallocene. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

• Added archive https://web.archive.org/web/20070716220828/http://www.iupac.org/reports/1999/7108salzer/index.html to http://www.iupac.org/reports/1999/7108salzer/index.html

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

• If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
• If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 16:31, 26 January 2018 (UTC)