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I could find many sources confirming the hydrate isomerism(with water as solvent) but I couldn't find any information about any other solvent. In all the sources "hydrate/solvate isomerism" is written but no example with any other solvent.

I came across this question:

The total number of possible isomers for $\ce{[Pt(NH3)4Cl2]Br2}$ are?

If we consider $\ce{[Pt(NH3)3Cl2Br]Br.NH3}$ and $\ce{[Pt(NH3)3ClBr2]Cl.NH3}$ also, then the answer should be 12. Without them, the answer would be 6.

Any help will be appreciated.

PS: I have seen this. But I don't think the reasoning is correct because hydrate isomers do exist.

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    $\begingroup$ I can produce no example nor completely refute their existence. However, they should be significantly rarer than hydrates, because ammonia is both a much better ligand than water and is much more volatile, both factors which should destabilise ammonia solvates. $\endgroup$ Oct 5 '21 at 4:51
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    $\begingroup$ Also, $\ce{Cu[PtCl6]·18NH3}$ $\endgroup$ Oct 5 '21 at 5:28
  • $\begingroup$ Also I would like to ask, does all the 6 ionisation isomers do exist in real, or are they only theoretical? $\endgroup$
    – Govind
    Oct 5 '21 at 5:48
  • $\begingroup$ I was looking to give a bounty but OP did it. Thanks. Ànyways, here's the bounty message: "Answer should contain explanation (a bit of history if possible) and some examples of such complexes. Nicolau's reasoning can be expanded to an answer. Also, it would answer OP's compound." I don't have time for an answer so someone can answer this. $\endgroup$ Oct 8 '21 at 2:23
  • $\begingroup$ Some links: researchgate.net/figure/… ... researchgate.net/figure/… $\endgroup$ Oct 8 '21 at 2:30

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