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itchyfruit
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This all looks rather interesting,is copper thiocyanate as toxic as it sounds?
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woelen
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Thiocyanates are not really toxic and do not have to do much with cyanide. Potassium- or sodium thiocyanate and ammonium thiocyanate are easy to
obtain chemicals and they can be purchased without any eyebrows raised. They are used extensively in hobby photography, darkroom processes.
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ammonium isocyanate
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Depends. The thiocyanate anion is much less toxic than the cyanide anion, so much so that back in adv. chem in 10th grade they let us work with it.
Copper ions are somewhat toxic, but again nothing compared to cyanide. Sigma Aldrich lists it as Xn and N (harmful and hazardous to the environment),
but they don't list any serious safety phases, other than dispose properly, keep away from food, etc.
In summary, I wouldn't be too worried about working with it.
Edit: whoops, looks like I got beaten to it.
[Edited on 12-9-2009 by ammonium isocyanate]
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itchyfruit
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Cool !!! i'm quite interested in copper salts myself and i think i have some ammonium thiocyanate.
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JohnWW
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The soluble (mainly alkali-metal and ammonium) and volatile (capable of being inhaled, particularly light organic esters) thiocyanates should be more
toxic (and more immediately so) than the heavy-metal ones, due to the latter being much less soluble and so less reactive. The latter may be
decomposed by stomach acid if ingested, but this would be a relatively slow process (enabling detoxification at the same time) compared to the rapid
effects of soluble ionic thiocyanates.
[Edited on 13-9-09 by JohnWW]
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woelen
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With the latter I disagree, e.g. lead thiocyanate and mercury thiocyanate are MUCH more toxic than e.g. potassium thiocyanate, simply because of the
toxic metal ion, despite their low solubility. Many insoluble thiocyanates easily dissolve in stomach acid (contains dilute HCl), due to formation of
HSCN and the consequent release of the toxic heavy metal ion.
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Jor
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Talking about mercury thiocyanate, something really fun can be done with this substance:
http://www.youtube.com/watch?v=T-eagMQ6vNE
Not recommended though due to the mercury vapours released, wich are bad for health and environment.
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itchyfruit
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Cool, any idea what you end up with? compound wise, i know it looks like a big piece of tree bark.
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DJF90
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Thats the basis for the "snakes in the grass" experiment (basically that combined with an ammonium dichromate volcano). Quite interesting, although
I'm not sure what the products of the reaction is.
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woelen
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I updated my experiments with copper/pyridine/iodide. I now was able to make the complex with green/cyan fluorescence and again made the complex with
yellow fluorescence and I made two durable display samples:
http://woelen.homescience.net/science/chem/exps/fluorescent_...
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cyanureeves
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woelen do you have copper cyanide? mixing potasium cyanide with copper sulfate makes copper cyanide but also cyanogen and cyanogen is toxic.will
cyanide dissolve copper sponge as easy as dissolving silver sponge?copper cyanide is supposed to be a pale yellow color which precipitates after
adding sodium sulphide to copper sulfate but also makes cyanogen,i think.
[Edited on 11-8-2015 by cyanureeves]
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woelen
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I do not have copper cyanide. I see no relation with the subject of my previous post. Can CuCN be used to make interesting fluorescent complexes?
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cyanureeves
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dont know if if copper cyanide glows with a fluorescent light but i know scorpions do.
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careysub
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Quote: Originally posted by woelen  | | I do not have copper cyanide. I see no relation with the subject of my previous post. Can CuCN be used to make interesting fluorescent complexes?
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Possibly he is thinking of the use of potassium cupric cyanide in the luminol clock reaction?
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cyanureeves
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no i just saw copper complex and jumped right in because i was curious as to how copper cyanide was made.this thread is about glowing copper only and
i just know about the glowing scorpions.at least i know they glow under a black light but fluorescent light might be different maybe.a luminol clock
huh?well i'll just go over to google to see what all that is about.
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woelen
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With morpholine, also interesting fluorescence is exhibited. I tried in a similar way as with pyridine, add a solution of morpholine in water to a
suspension of CuI in a solution of KI. A pale yellow precipitate is obtained, which gives bright orange light when irradiated with black-light.
I also tried with 2,2-bipyridyl, but this does not give fluorescence. A nice, bright orange/brown precipitate is fomed though. On dilution with water,
part of this dissolves, but the color of the remaining material becomes even brighter, red/brown.
I will add this findings to my webpage as well.
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