Bezaleel
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Ion exchange resin for converting CsCl to CsSCN
H.L. Wells describes Cs4[Mn(SCN)6] as magnificent massive crystals, pale yellowish-green (American Chemical Journal, 1902, 28, p 261-262). I'd like to
see those, but I don't have any CsSCN, nor any Cs2CO3 to make it from HSCN solution.
So I thought that maybe CsSCN can be made through ion exchange. Can anyone refer me to a document or site which describes what resin could be used for
this? Starting material is preferably CsCl.
I found some basic knowledge about ion exchange resins, like here, but I'm interested in more detailed or practical knowledge, like column size, flow speed, preparation and regeneration conditions, etc.
Thanks!
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Bedlasky
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I think, that this salt will precipitate from solution containing Mn2+, SCN- and Cs+. Double salts of Cs are in most cases insoluble.
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Tsjerk
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You don't really need a column, you can just stir a suspension of resin for a while and repeat the process a couple of times to make sure you get out
most of the chloride. The equilibration of chloride/thiocyanate is fast, a couple of minutes should be more than sufficient.
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Bezaleel
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Quote: Originally posted by Bedlasky  | | I think, that this salt will precipitate from solution containing Mn2+, SCN- and Cs+. Double salts of Cs are in most cases insoluble.
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The Cs Tutton salts are all very well soluble.
So, there's only one way to find out - to the lab! 
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Boffis
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Hi Bezaleel, Yes I am sure it will work. When you have got/chosen your resin find the data sheet for this specific product. It will usually give a
figure for exchangable ions in millimoles per gram and the wet packing density. From these figures you can calculate the amount you require. I have
done similar preps using other ions. Larger ions like the thiocyanate ion may diffuse into the resin more slowly than smaller ones like chloride so I
would soak your resin in a large excess of thiocyanate say x2 by running this through a column first then clean water. Saturate the column with
deionised water and then run your CsCl solution through slowly. I used a 40% excess of resin over what was theoretically required.
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Bezaleel
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| Quote: Originally posted by Boffis | | Hi Bezaleel, Yes I am sure it will work. When you have got/chosen your resin find the data sheet for this specific product. It will usually give a
figure for exchangable ions in millimoles per gram and the wet packing density. From these figures you can calculate the amount you require. I have
done similar preps using other ions. Larger ions like the thiocyanate ion may diffuse into the resin more slowly than smaller ones like chloride so I
would soak your resin in a large excess of thiocyanate say x2 by running this through a column first then clean water. Saturate the column with
deionised water and then run your CsCl solution through slowly. I used a 40% excess of resin over what was theoretically required.
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Thanks so much, Boffis!
Q: You said: "When you have got/chosen your resin find the data sheet for this specific product." Do you mean the data sheet for the resin, coming
from the supplier? Or do you mean a specific data sheet for that resin for SCN- exchange?
I'm still very new to this, so I'm trying to find my way in a dark room...
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