bolbol
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Which transition metals does cyanide produce soluble complexes with?
I was wondering if anyone knows of any sources for this information. I haven't found one that has a full coverage of all transition metals. I have
many different samples of different mixtures of metal oxides produced from sulfide mineral bearing rocks. I want to know what, besides gold, cyanide
will dissolve so I can selectively drop them out of solution if present.
[Edited on 23-7-2019 by bolbol]
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DraconicAcid
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I'm thinking nearly all of them form stable complex anions with cyanide (although I seem to recall that copper(II) ions will react with cyanide to
give copper(I) cyanide and cyanogen).
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Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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bolbol
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Then the question becomes whether or not these complexes will be soluble enough to be fully leached into the solution..
And I'm assuming by all, it also includes the PGEs? Considering they are present and in oxidized states?
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DraconicAcid
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Yes, the platinum group metals will form complexes with cyanide. The solubility will depend on what the counterion is. (Potassium
tetracyanoplatinate(II) is only slightly water-soluble, for example.)
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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Boffis
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There is a comprehensive book on the chemsitry of cyanogen that is well worth getting. It is one of my "go to" bibles. It is called "Cyanogen
Compounds, Their chemistry, detection and estimation" by H E Williams 2nd ed 1948. It is usually available on amazon and is never expensives (like
£3). The 1915 1st edition can be downloaded from the net for free.
The basic chemistry of the cyanide complexes hasn't change much since 1948 though there are many more mixed ligand types known now.
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Hegi
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As far as I know you can make also soluble silver and platinum cyanide complexes, for sure you can make hexacyanochromate (I have worked with this
anion), cobalt(III) forms this complex too, if you take cobalt(II) and react it in inert atmosphere you will obtain beautiful green pentacyano
complex. You probably know about iron cyanide complexes.. I have no more ides.
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