Admagistr
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Metallic citrates
Has anyone made metallic citrates?Do you have any photos,or interesting practical experience with it...?Copper citrate is decomposed by heat into self
igniting copper powder,ferric citrate is reduced by UV radiation, undoubtedly wil be interesting chromium or aluminium citrate and other...
[Edited on 6-5-2023 by Admagistr]
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mayko
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There's this thread on copper citrate:
https://www.sciencemadness.org/whisper/viewthread.php?tid=62...
al-khemie is not a terrorist organization
"Chemicals, chemicals... I need chemicals!" - George Hayduke
"Wubbalubba dub-dub!" - Rick Sanchez
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Bezaleel
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Lion850 made some, IIRC. I recommend to search this forum on his posts.
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Admagistr
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Thanks,I'll check it out,Lion850 has quality posts.
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Bedlasky
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I played little bit with UV decomposition of Fe(III) citrate, tartrate and oxalate complexes. I just dissolved NH4Fe(SO4)2 and corresponding
carboxylic acid in water, add little bit of H2SO4, put these solutions under UV and observe colour change. I found some article describing method for
determination of carboxylates using this reaction. They meassured amount of CO2 with CO2 electrode.
https://cdnsciencepub.com/doi/pdf/10.1139/v78-401
Reaction of oxalate and Fe(III) under UV can be also used for determination of Fe(III). Fe(II) which formed under UV is titrated with standard Na3VO4
solution in acidic environment - vanadate doesn't react with excess of oxalate, unlike dichromate or permanganate which are usually used for titration
of Fe2+.
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KoiosPhoebus
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An interesting idea is to add an monovalent cation to divalent metal citrates to
increase their solubility. My understanding is that divalent metal citrates of the form M3(Citrate)2 have low solubility due to
the formation of a polymer-like structure which is difficult to dissolve. Adding a monovalent cation like ammonium or potassium would instead form
M1X1Citrate, and because citrate has low affinity for most monovalent cations, the double salt would dissociate into a
negatively charged MCitrate- complex and X+ in solution.
For an example of what I mean - see this video where cupric ammonium citrate was prepared: https://www.youtube.com/watch?v=M460YRaBC6s
I've been meaning to try my hand at the preparation of cupric ammonium citrate for a while now, but it's slid down the priorities list.
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Sir_Gawain
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Ferric ammonium citrate is a light-sensitive compound used in making blueprints (the real kind). I've done the synthesis once and do not wish to
repeat it because it involves concentrated ammonia and iron hydroxide, two chemicals I have an extreme dislike for. It also has to be carried out in
the dark, for obvious reasons.
“Alchemy is trying to turn things yellow; chemistry is trying to avoid things turning yellow.” -Tom deP.
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maldi-tof
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I tried ferric citrate, but cero success on it.
If someone has some experience on that, i will try my best and report it back 
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SnailsAttack
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I’ve been meaning to research metal citrates. Bought a large bag of citric acid last year.
The iron citrate behavior sounds interesting
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