fausap
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potassium tetrachloroplatinate solution
Hello all,
Thanks a lot for allowing join me this board.
I'm an amateur analogue photographer, and I love chemistry, so I prefer mixing all my photo chemicals by myself.
I started to do some platinum printing and I'm trying to find a way of making a potassium tetrachloroplatinate solution (in water) using
chloroplatinic acid and potassium hydroxide.
Because there are two salts obtained from chloroplatinic acid, tetra- and hexa-, I am quite confused about which one I got from this reaction.
I have some rudimentary knowledge about acid-base reactions, but this maybe is to complex for my experience 
Looking around some web sites, I found another way to make potassium tetrachloroplatinate: reducing potassium hexachloroplatinate with hydrazine, but
this is beyond my comprehension.
Could you help me?
Thanks a lot,
Fausto
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Bedlasky
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Hi.
Welcome on SM forum .
Quote: Originally posted by fausap  | Hello all,
Because there are two salts obtained from chloroplatinic acid, tetra- and hexa-, I am quite confused about which one I got from this reaction.
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Chloroplatinic acid = hexachloroplatinic acid. So you'll get hexachloroplatinate.
For what purpose you need potassium hexachloroplatinate? This salt is insolube in water - so if you want to do aqueous Pt chemistry, just use
chloroplatinic acid.
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fausap
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Hello,
thanks for the clarification.
I don't want the hexa-, because, as you said, it's insoluble in water. I need the tetra.
Here in Poland, it's quite hard to find the tetra salt, but I can get the hexa and the chloroplatinic acid.
So, as you said, I'm out of luck about the potassium hydroxide and chloroplatinic acid reaction.
Do you know, instead, about this reaction with hydrazine?
thanks,
Fausto
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Bedlasky
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I found this:
http://www.ch.ic.ac.uk/local/projects/s_liu/Html/Synthesis.h...
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fausap
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Thanks a lot! This is quite interesting.
I have a couple of questions:
1) handling hydrazine hydrochloride will require some special equipment?
2) if I stop at step two because I do not need crystals, can I filter the remaining insoluble hexa, to get a solution of potassium
tetrachloroplatinate?
thanks a lot,
Fausto
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S.C. Wack
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Reduction by potassium bisulfite or hypophosphite:
http://www.ajsonline.org/content/s3-48/287/397.full.pdf+html
https://books.google.com/books?id=6fDRAAAAMAAJ&pg=PA397
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fausap
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Thanks a lot! I bought the article right now and it's very interesting.
The reduction with potassium acid sulfite (I suppose this is the other name of potassium bisulfite) seems to me quite interesting and the easiest.
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mackolol
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You can buy tetrachloroplatinate in Poland. It's quite costy but available.
here's the link: https://pol-aura.pl/tetrachloroplatynian-potasu-ii-46-47-pt-...
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fausap
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Yes... but those prices are too much over the standard price for that product.
Maybe because of the purity. In the US I can find the potassium tetrachloroplatinate at $40 per gram, for example. And the shipping cost is $25
Here in Poland I can find the hexa at a reasonable price: 170zl per gram.
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Bedlasky
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What will you do with potassium tetrachloroplatinate, may I ask? I never did Pt
chemistry, so I am interested.
[Edited on 14-4-2020 by Bedlasky]
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fausap
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Sure
It's the metallic salt needed for platinum printing. You can use also palladium, but now it's more expensive than platinum, so it's not a good idea
It reacts (under UV light) with ferric oxalate.
Then the exposed coated paper is developed with potassium oxalate, for example, or ammonium citrate (dibasic).
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Bedlasky
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It's really interesting! I never heard about platinum printing.
I did some ferric carboxylate photochemistry (https://colourchem.wordpress.com/2019/06/25/photochemical-ox...). I tried also few very simple blueprints.
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S.C. Wack
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The last few entries in vol. 2 of Inorg Syn are Pt cpds., including this one using H2SO3.
https://archive.org/details/in.ernet.dli.2015.11546
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mackolol
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May I know in which company?
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fausap
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Sure.
Keten.com.pl
but now he is posting the Amidol on Allegro too.
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fausap
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this is very interesting!
I would like to try this!
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fausap
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this is very interesting. Did you try some prints with these sensitizers?
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mackolol
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Oh, thanks very much. There are quite a few good chemical companies in Poland, and each of them has something different to offer. I forgot about this
one, but it seems very interesting.
[Edited on 17-4-2020 by mackolol]
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Bedlasky
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No, I never tried prints with this. Only simple shapes, just for fun. But NileRed have some videos about blueprints.
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