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Higher oxidation states[edit]

A recent paper in Nature Chemistry, authored by Mao-sheng Miao, found that under conditions of extreme pressure (greater than 30 gigapascals), the inner electrons (i.e those in the d and f shells), could possibly be used to form chemical bonds. This discovery indicates that compounds such as caesium triflouride or caesium pentaflouride could exist under such conditions[1] .

Do we really need this?

--Stone (talk) 19:06, 22 November 2013 (UTC)

I would say yes. You would include it if they were synthesized, right? So I think they deserve to be mentioned, as it's especially interesting for an alkali metal (which "should" by all rights have +1 as its maximum oxidation state, not +5!). I think this is kind of like HgF4 before its synthesis; a predicted breach of the inner subshells of a main group element by fluorine, though not confirmed experimentally as yet. (Note, it's not the d- and f-electrons that are bonding; it's the p-electrons. In these higher fluorides Cs behaves as though it were the seventh 5p element, after Xe.) Double sharp (talk) 13:45, 23 November 2013 (UTC)
P.S. A nice guy on Reddit has posted a link to the fulltext of the paper: [1]. Check it out! Double sharp (talk) 13:46, 23 November 2013 (UTC)
It is a primary source of a fact which is not in reach for quite some time, why not wait for a review picking up this? --Stone (talk) 22:44, 23 November 2013 (UTC)
I think it should still be in there, but only as a note. It's not really important as yet, being unsynthesized, but once it is it certainly would be classified as important (along with HgF4). It is still interesting. Double sharp (talk) 04:27, 24 November 2013 (UTC)

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