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bnull
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| Quote: | | To bnull: I can't seem to find any links to the supplementary paper, so I can't provide it. I'd like to try out this synthesis of MnCl2
myself, but I am currently trying to obtain a 10cm borosilicate dish for this process. I will be preparing ≈30g of anhydrous MnCl2 with
excess HCl. |
I'm not surprised. Odds are that it wouldn't have enough details on the process anyway. Thanks for trying.
[Edited on 9-1-2026 by bnull]
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Fery
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| Quote: | Manganese(II) chloride is commercially available as MnCl2 . 4 H2O containing 36.4% water. Under an argon atmosphere most of the water is lost at 350
C, but absolutely anhydrous material is only obtained after prolonged heating at 400 C.
Our method is as follows: Finely ground MnCl2 . 4 H2O (50 g) was heated in vacuo at 200 C for 6 h, the cake finely ground, and then further heated in
vacuo at 220 C for 6 h. |
https://sci-hub.st/10.1016/S0020-1693(00)90464-X
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Altreon
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| Quote: |
Manganese(II) chloride is commercially available as MnCl2 . 4 H2O containing 36.4% water. Under an argon atmosphere most of the water is lost
at 350 C, but absolutely anhydrous material is only obtained after prolonged heating at 400 C.
Our method is as follows: Finely ground MnCl2 . 4 H2O (50 g) was heated in vacuo at 200 C for 6 h, the cake finely ground, and then further heated in
vacuo at 220 C for 6 h.
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This source seems quite dubious. Not only does it not mention hydrolysis in any way, despite the absurd temperatures, it seemingly implies the
existence of a hemihydrate, which has not been supported by any of the sources quoted in this thread. Now, I must admit that I cannot confirm or deny
a hemihydrate existing, as I cannot accurately measure yield because of the MnCO3 used for purification. It may be the case that my product
is a hemihydrate, but I highly doubt that these guys would happen to be the only ones who would mention a dehydration issue this severe.
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bnull
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Have you checked parts I through VI of the same series?
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Altreon
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I have, and they seem to use harsher dehydration conditions as the articles progress (from 110-130°C 8h in III, to 100-200°C 6h in V, and finally to
200-220°C 12h in VII, all under vacuum)
I'm not sure why they seem to be the only ones having such a hard time dehydrating MnCl2, even compared to other sources already mentioned
here which just use dry HCl at regular atmospheric pressure in some way.
VII mentions
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Painstaking investigations of a large number of dehydration-without-decomposition methods, which will be the subject of another publication, ...
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but I cannot seem to find that article.
[Edited on 13-1-2026 by Altreon]
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bnull
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The series goes up to part 14 at least, https://doi.org/10.1039/DT9850000135.
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