Timeline for How does the Jahn-Teller distortion result in both elongation and compression?
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Mar 25, 2019 at 9:34 | comment | added | orthocresol | (1) looking at the geometry is the easiest way (2) it is both at the same time, but it gets really wordy | |
| Mar 25, 2019 at 3:17 | comment | added | Tan Yong Boon | @orthocresol Actually, it isn't quite right to say that it is compression along the z axis but rather an elongation along the x and y axes. Is that right? | |
| Mar 25, 2019 at 3:13 | comment | added | Tan Yong Boon | @orthocresol So is there any way to predict axial elongation/compression? I have read that electron density measurements performed on the complex ion can help us determine the orbital occupation in the eg set, allowing us to decide on whether elongation (when $\ce {d_{z^2}}$ is populated) or compression (when $\ce {d_{x^{2}-y^{2}}}$ is populated) occurs. | |
| May 26, 2018 at 1:55 | history | tweeted | twitter.com/StackChemistry/status/1000193659827113984 | ||
| May 25, 2018 at 23:42 | comment | added | Tan Yong Boon | @orthocresol Thanks for the insightful comment. I can send you the paper if you could give me some mailing address. Also, have you actually heard of this explanation using the nature of d orbitals before? | |
| May 25, 2018 at 23:33 | comment | added | orthocresol | I cannot access the article right now because the ACS website is acting up, but I don't actually like the explanation as quoted: it seems to be circular logic. For the compression case, though, you simply need to replace $z^2$ with $x^2-y^2$ and $z$-axis with $xy$-plane. As an aside, the Jahn–Teller theorem, by itself, does not predict whether elongation or compression is observed. It only predicts that a distortion from $O_\mathrm h$ to $D_\mathrm{4h}$ symmetry will occur. Both elongation and compression fulfil this requirement. | |
| May 25, 2018 at 23:09 | history | asked | Tan Yong Boon | CC BY-SA 4.0 |