# Talk:Metal carbonyl

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Effective At No. Rule
Colours shown by metal Carbonyl Compounds
non-classical carbonyls

(removed from the main page by --Smokefoot (talk) 23:08, 23 February 2008 (UTC))

## What does this mean?

"Complexes of PF3 often parallel those of the metal carbonyls." Does it mean the Complexes of PF3 is similiar to metal carbonyls? I would like to know the meaning. Thanks a lot.--Wolfch (talk) 13:48, 19 August 2010 (UTC)

## bi metallic

Are there any carbonyls that contain two different metal atoms in the one molecule? Graeme Bartlett (talk) 12:33, 1 October 2010 (UTC)

Yes, see i.e.: E. Roland und H. Vahrenkamp: Zwei neue Metallcarbonyle: Darstellung und Struktur von RuCo2(CO)11 und Ru2Co2(CO)13. In: Chemische Berichte. März 1985, Volume 118, Issue 3, S. 1133–1142 (doi:10.1002/cber.19851180330).
${\displaystyle \mathrm {4\ KCo(CO)_{4}\ +\ [Ru(CO)_{3}Cl_{2}]_{2}\ \longrightarrow \ 2\ RuCo_{2}(CO)_{11}\ +\ 4\ KCl} }$
-- Linksfuss (talk) 20:42, 27 June 2014 (UTC)

## Carboxyhemoglobin

A heme unit of human carboxyhemoglobin, showing the carbonyl ligand at the apical position, trans to the histidine residue.[1]

I know the parent article is weak too, but I thought a brief mention might be nice in this article. I've prepared an image of carboxy heme --Rifleman 82 (talk) 16:35, 30 April 2012 (UTC)

That is a great idea. Now we eventually need to do something about the dreadful article on IR spectra of metal carbonyls, the only good parts of which are duplicate this article. --Smokefoot (talk) 17:39, 30 April 2012 (UTC)
I've redirected it here already. I don't see the reason for re-explaining IR spectroscopy (in the early part of that article).
I think we can start a new section "biological occurrence" and briefly mention metal carbonyls at the core of hydrogenases, together with carboxyhemoglobin. I'll try to find a crystal structure. --Rifleman 82 (talk) 18:33, 30 April 2012 (UTC)

## History / Isolobal principle

Hi Smokefoot, I thought that the history section gives a more generally understandable access to the topic, at least for non-chemists; this is why I put it to the top. Furthermore I believe that the Isolobal principle allows a better understanding of some metal carbonyl structures. I think it should be mentioned somewhere in the article (ok, may be not in the synthesis section). -- Linksfuss (talk) 13:36, 1 May 2012 (UTC)

Usually our articles focus on the basic observables (structures, formulas, syntheses, apps) before discussing theoretical aspects, at least at length. That arrangement is my understanding, and I think it is a good idea. I will suggest this on a talk page of our Manual of Style and see what others think. Thanks for noticing.--Smokefoot (talk) 12:50, 17 May 2012 (UTC)

## Tri-/Tetramerization

Hi Smokefoot, Wolfgang A. Herrmann called this in a review article about metal carbonyls (W. A. Herrmann: 100 Jahre Metallcarbonyle. In: Chemie in unserer Zeit. 1988, 22. Jahrg., Nr. 4, ISSN 0009-2851, pp. 113–122) a "legendary reaction discovered by Reppe" (W. Reppe, 0. Schlichting, K. Klager and T. Toepel. Cyclisierende Polymesrisation des Acetylens. In: Justus Liebigs Ann. Chem. 560, 1 (1948).) -- Linksfuss (talk) 09:38, 17 May 2012 (UTC)

Trimerization is a legendary reaction. But it is not useful and definitely not an application. I am almost certain that the tetramerization to COT is also not used for anything except to supply researchers. Also, according to our article cyclooctatetraene, it is more commonly prepared by non carbonyl routes. Looking forward to your future edits.--Smokefoot (talk) 12:28, 17 May 2012 (UTC)
Just checked my favorite source on industrial routes for the synthesis of substituted pyridines from alkynes and nitriles. Ullmann's Encyclopedia of Industrial Chemistry indicates that it is used, but the catalyst is CpCo(cod), which also fits my recollection. There is a review by Boennemann (MPI-Muelheim) in ACIE many years ago on this theme if you want to dig forward in time (DOI: 10.1002/anie.197805051).--Smokefoot (talk) 12:50, 17 May 2012 (UTC)

## Quality Rating

Is the quality rating "C" still valid? I must admit that I would rate it higher than that. -- Linksfuss (talk) 10:29, 22 December 2012 (UTC)

## Wrong designation of MO scheme

Concerning the correct labeling of the MO scheme (only the valence electrons shown):

The 4sigma label of the highest MO should be exchanged by 6sigma — Preceding unsigned comment added by 2A02:120B:2C7E:71D0:9CF6:5400:4E09:9B7E (talk) 17:43, 29 May 2015 (UTC)

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1. ^ Gregory B. Vásquez, Xinhua Ji, Clara Fronticelli, Gary L. Gilliland (1998). "Human Carboxyhemoglobin at 2.2 Å Resolution: Structure and Solvent Comparisons of R-State, R2-State and T-State Hemoglobins". Acta Crys. D. 54 (3): 355–366. doi:10.1107/S0907444997012250.