Reference for diamagnetic vs paramagnetic

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    Diamagnetic Reference
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Discussion Overview

The discussion revolves around the magnetic properties of iron compounds, specifically Fe2+ and Fe3+, in solution with various ligands. Participants seek resources, such as tables or textbooks, that categorize these compounds as paramagnetic or diamagnetic, and they explore the underlying chemistry concepts related to electron configurations and ligand effects.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses difficulty in finding a comprehensive table of Fe2+ and Fe3+ compounds categorized by their magnetic properties.
  • Another participant suggests the CRC handbook as a potential resource for magnetic susceptibility data.
  • It is noted that Fe3+ has an odd number of electrons, indicating at least one unpaired electron, which contributes to its paramagnetic nature.
  • Some ionic complexes may exhibit surprising diamagnetism despite containing unpaired electrons, which raises questions about the conditions under which this occurs.
  • Participants discuss that most Fe2+ compounds typically have unpaired electrons unless specific ligand conditions are met.
  • There is mention of the differences in d electron configurations between Fe2+ (d6) and Fe3+ (d5), and how ligand field geometries (tetrahedral vs. octahedral) affect energy levels of orbitals.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the availability of comprehensive resources or the specific conditions that lead to diamagnetism in certain complexes. Multiple viewpoints on the search for information and understanding of the concepts remain present.

Contextual Notes

Limitations include the potential lack of comprehensive resources and the challenge of finding specific information on ligand effects and magnetic properties in the literature.

JustinLevy
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I am not a chemist, so I have a feeling I'm going about searching for the wrong key words or something.

What I want is a table of Fe+2 and Fe+3 compounds in solution (ie. different ligands like CO, CN-, etc.), listing each compound as paramagnetic or diamagnetic. I've searched for a nice chemistry review article that may have this, but this seems too "old" of information so I can't find anything good.

Maybe a good textbook? Or maybe I just don't know how to search for articles well without getting all kinds of noise to sift through.

Please, can anyone help?
Anyone take inorganic chem and can check their textbook, or recommend one?
 
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Try the CRC handbook
 
Fe3+ has an odd number of electrons, so at least one electron will be unpaired.
 
nbo10 said:
Try the CRC handbook
I looked through the online one which allowed searching. Found some iron compounds under a table for "MAGNETIC SUSCEPTIBILITY". I didn't think of looking for that. Maybe with that keyword I can find some more info online, but I'm still struggling to find a huge list. The CRC one was mostly limited to halogen salts. So they didn't even have CO or CN- ligands listed, let alone some common bidentite ones.

PhaseShifter said:
Fe3+ has an odd number of electrons, so at least one electron will be unpaired.
Some ionic complexes have two metallic centers, and so I have been warned that there are cases which are surprisingly diamagnetic. Also, apparently most Fe+2 compounds still have unpaired electrons, unless the ligands are 'just right' or something ... I wish I understood this better. Google books spits out snippets from some chemistry textbooks, so maybe I'll hit up the chemistry library later. But there has got to be some good information on the internet somewhere, if only I knew how to search for it better.
 
JustinLevy said:
Also, apparently most Fe+2 compounds still have unpaired electrons, unless the ligands are 'just right' or something ... I wish I understood this better. Google books spits out snippets from some chemistry textbooks, so maybe I'll hit up the chemistry library later. But there has got to be some good information on the internet somewhere, if only I knew how to search for it better.
d electron spin states

Keep in mind Fe2+ is d6, while F3+ is d5.

also, a tetrahedral ligand field will result in two lower energy orbitals and three higher energy, as opposed to three lower and two higher for octahedral complexes.
 
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