Electron count in transition metal complex

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Discussion Overview

The discussion revolves around determining the total electron count in transition metal complexes, specifically using examples like W(CO)6 and RuH(Cl)(PPh3)3. Participants explore the concept of total electron count versus d electron count and the implications of oxidation states and overall charge on these calculations.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant queries how to find the total electron count in transition metal complexes, distinguishing it from d electron count.
  • Another participant argues that without specified oxidation states or overall charge, one cannot determine the total electron count accurately.
  • A third participant expresses confusion regarding the definition of "total electron count" and questions which electrons should be considered as part of the complex.
  • A link to a resource on the 18-electron rule is provided by one participant, indicating they found the information they needed.
  • Another participant mentions they have never used the 18-electron rule in their research on metallo-organic complexes, suggesting a divergence in approaches to the topic.

Areas of Agreement / Disagreement

Participants do not reach a consensus on how to define or calculate the total electron count in transition metal complexes. There are competing views regarding the necessity of oxidation states and charge specification.

Contextual Notes

Participants express uncertainty about the definition of total electron count and its application, highlighting the dependence on oxidation states and overall charge for accurate calculations.

plexus0208
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How do I find the total electron count in a transition metal complex? For example, something simple like W(CO)6 or even more complicated like RuH(Cl)(PPh3)3?

(Note: I don't mean "d electron count" [which I know how to find], I mean "total electron count.")
 
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You can't. That's what oxidation numbers are for.

Sure, you might be able to guess; e.g. if one (and only one) oxidation state of tungsten tended to be hexacoodinated. But the short of the long is that if someone hasn't specified the overall charge of the complex or the oxidation state, then they haven't specified the compound.
 
I am not sure I understand the question.

plexus0208 said:
How do I find the total electron count in a transition metal complex? For example, something simple like W(CO)6 or even more complicated like RuH(Cl)(PPh3)3?

What is "total electron count in a complex"?

W(CO)6 is neutral, so there are 74+6*(12+16) electrons in total (if charge is given just subtract it from the number calculated). Which of those electrons count as "electrons in complex", which don't?

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Hmm. I've never ever actually used the 18-electron rule for anything.

Which is saying something since my main research topic involves metallo-organic complexes!
 

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