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This answer shows why ozone should be diamagnetic. Still, Wikipedia article says it is weakly paramagnetic, having positive magnetic susceptibility $χ = \pu{+6.7E−6 cm^3 mol^-1}.$ There's a paper discussing it [1], saying it's only a value reported for liquid $\ce{O3},$ but it's paywalled. What is the reason for such discrepancy?

Reference

  1. Anantakrishnan, S. V. The Structure of Ozone—An Interpretation of Its Magnetic Susceptibility. Proc. Indian Acad. Sci. (Math. Sci.) 1947, 25 (6), 520. DOI: 10.1007/BF03172553.
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  • $\begingroup$ The 1947 paper you cite concludes that "Calculation of magnetic susceptibility for the different valence bond structures indicate that ozone should be diamagnetic, the susceptibility being about -18 x 10^6 while reported experimental values show that it is feebly paramagnetic in the liquid state, diamagnetic values being reported for the gaseous state." $\endgroup$
    – ACR
    Commented Nov 6, 2021 at 16:02
  • $\begingroup$ Basically when you think about such questions, you have to also think about the state of that compound/element and also the temperature. Ozone can be a gas, liquid, or a solid. This is how you can critically analyze the thoughts. $\endgroup$
    – ACR
    Commented Nov 6, 2021 at 16:04
  • $\begingroup$ OP can read another open access article on ozone's magnetic behavior. It is dated but you can enjoy the original experiments. ncbi.nlm.nih.gov/pmc/articles/PMC1085222 $\endgroup$
    – ACR
    Commented Nov 6, 2021 at 16:43
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    $\begingroup$ doi.org/10.1080/00268978300100581 might be of interest: "Ozone is a quite exceptional molecule in several respects; it is van Vleck paramagnetic, there is extreme antishielding of the nuclei and the dependence of both χ and σ on small changes of the geometry is fantastic." $\endgroup$
    – Ian Bush
    Commented Nov 6, 2021 at 22:04
  • $\begingroup$ It is also difficult to determine experimentally, since ozone is non-cooperative. See Derek Lowe on working with ozone and its derivatives. science.org/content/blog-post/… . $\endgroup$
    – DrMoishe Pippik
    Commented Nov 8, 2021 at 0:41

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