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Is there a chemical compound which does not have a liquid state but a solid and a gaseous state? Meaning no matter the temperature or pressure it will never be in its liquid form. According to my rather basic knowledge of chemistry this means that it has a critical temperature lower than the melting point.

I have seen this question already, but it only talks about elements and not compounds.

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    $\begingroup$ Lots of them. They decompose on heating before they would melt, like hydrate salts, most hydroxides and carbonates, etc. $\endgroup$
    – Oscar Lanzi
    Commented Aug 26, 2022 at 11:27
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    $\begingroup$ Most organic compounds decompose before melting. So is there many unstable inorganic compounds, that decompose if the frost is not deep enough, or before reaching melting point. $\endgroup$
    – Poutnik
    Commented Aug 26, 2022 at 12:31
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    $\begingroup$ chemistry.stackexchange.com/questions/31050/can-you-melt-wood chemistry.stackexchange.com/questions/62539/… $\endgroup$
    – Mithoron
    Commented Aug 26, 2022 at 13:35
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    $\begingroup$ chemistry.stackexchange.com/questions/94003/… $\endgroup$
    – Mithoron
    Commented Aug 26, 2022 at 13:36
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    $\begingroup$ Neither of these actually answer the question if any of these compounds have a solid & and a gaseous state but no liquid state, as they decompose before they would be either gaseous or liquid. So no these do not actually answer my question. @Mithoron $\endgroup$
    – SirHawrk
    Commented Aug 26, 2022 at 13:38

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