Talk:Iodite

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please add a link to the German article "Iodige Säure" — Preceding unsigned comment added by 90.146.125.252 (talk) 10:17, 9 November 2019 (UTC)

That German page is linked to Iodous acid. An acid based on this iodite. Graeme Bartlett (talk) 04:19, 17 April 2026 (UTC)

Stable compound

Iodine with valence of 3 is supposed to exist in IO₄⁵⁻ found in the compound in Ma, Nan; Chen, Jin; Li, Bing‐Xuan; Hu, Chun‐Li; Mao, Jiang‐Gao (November 2023). "(NH 4 ) 2 (I 5 O 12 )(IO 3 ) and K 1.03 (NH 4 ) 0.97 (I 5 O 12 )(IO 3 ): Mixed‐Valent Polyiodates with Unprecedented I 5 O 12 − Unit Exhibiting Strong Second‐Harmonic Generation Responses and Giant Birefringence". Small. 19 (47). doi:10.1002/smll.202304388.

Is this an example of iodite? Graeme Bartlett (talk) 05:34, 17 April 2026 (UTC)

I think I₅O−12 is worth mentioning as an example of a (stable) polyiodate containing iodine(III). While it is formally derivable via condensation of [I^IIIO₄]⁵⁻ and [I^VO₃]⁻ units, we should be careful not to imply it contains isolated [I^IIIO₄]⁵⁻ ions.

The section on polyiodates in the just-published review Kang, Yuwei; Hu, Chun-Li; Zhang, Cai-Chun; Mao, Jiang-Gao (2026). "Recent Progress in Iodate Based Nonlinear Optical Crystals". Chemical Science. doi:10.1039/D5SC10104B. describes I₅O−12 as:

an I³⁺ ion ... coordinated by four O atoms from distinct [I^VO₃]⁻ groups, forming a square-planar [I^IIIO₄]⁵⁻ unit. All four [I^VO₃]⁻ groups are situated on the same side of this square plane, collectively assembling into a novel bowl-shaped polymeric unit [I^III(I^VO₃)₄]⁻.

The paper you've cited makes this clear this is a discrete I₅O−12 ion: it's only polymeric in the sense that it's a polyiodate. A third paper (doi:10.1002/anie.202504673) provides a name for the ion: tetraiodatoiodate(III). Preimage (talk) 13:49, 21 April 2026 (UTC)