DrIronic101
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Aluminum amalgam -- is there any good reason to use it?
It seems like with how easily accessible hydride reducing agents (NaBH4 and LiAH4) are, there should be no reason for one to make Al/Hg for a
reduction reaction. Are there any reduction reactions where Al/Hg is necessary, or can I get away with not dealing with Hg at all?
"Technically, chemistry is the study of matter, but I prefer to see it as the study of change. Electrons—they change their energy levels. Molecules
change their bonds. Elements—they combine and change into compounds. Well, that’s all of life, right? It’s the constant. It’s the cycle.
It’s solution, dissolution, just over and over and over. It is growth, then decay, then transformation." -Walter White on what chemistry is.
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Ubya
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surely one factor is cost. NaBH4 and LiAlH4 are expensive, if you need to reduce 10g or more of a compound, it starts getting expensive, even more if
the value of the compound you are reducing is less than the hydride itself. while dealing with mercury waste is a pain in the ass, it is cheap, or at
least cheaper than NaBH4 and LiAlH4
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rockyit98
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i really don't like lead and mercury compounds specially soluble ones.in case of making Aluminum amalgam it use Hg(NO3)2 or HgCl2 as much effective
than Hg metal.but for some reactions you can use GALLIUM and aluminium.like making Aluminium isopropoxide. gallium chloride can be reuse like Mercury
but with much more safely.play with care, use mercury compounds as last resort. watch Nurdrage's and NileRed's videos about mercury Aluminum amalgam
and mercury , gallium + Aluminum.
"A mind is a terrible thing to lose"-Meisner
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monolithic
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NaBH4 and LAH are easily available only if you work in an academic or industrial facility. This is why people use Al/Hg.
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karlos³
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I prefer to use Al/Hg for oxime reduction, as this isn't as cost or yield wise effective with a combination of borohydride with an additional reagent,
for example-
Al/Hg is superior for this matter only in my opinion.
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draculic acid69
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Quote: Originally posted by monolithic  | | NaBH4 and LAH are easily available only if you work in an academic or industrial facility. This is why people use Al/Hg. |
These things seem to be getting easier to acquire now than they were five or ten or 15yrs ago.
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Ubya
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but still hard and very expensive
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DrIronic101
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| Quote: Originally posted by rockyit98 | | i really don't like lead and mercury compounds specially soluble ones.in case of making Aluminum amalgam it use Hg(NO3)2 or HgCl2 as much effective
than Hg metal.but for some reactions you can use GALLIUM and aluminium.like making Aluminium isopropoxide. gallium chloride can be reuse like Mercury
but with much more safely.play with care, use mercury compounds as last resort. watch Nurdrage's and NileRed's videos about mercury Aluminum amalgam
and mercury , gallium + Aluminum. |
I've heard about using Gallium as an alternative to Hg. I'm very interested in it. Is Gallium easily available?
"Technically, chemistry is the study of matter, but I prefer to see it as the study of change. Electrons—they change their energy levels. Molecules
change their bonds. Elements—they combine and change into compounds. Well, that’s all of life, right? It’s the constant. It’s the cycle.
It’s solution, dissolution, just over and over and over. It is growth, then decay, then transformation." -Walter White on what chemistry is.
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Ubya
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on the internet yes, it is quite easy, getting a low price for it is a bit harder. i bought mine on ebay, some bought it from galliumsource.com (now
closed), there are many options while mercury is quite hard to find in reasonable quantities and prices
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karlos³
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I have to say, I have never read, heard or seen of any success stories with gallium activated aluminium for the usual reduction methods.
I am very doubtful of its properties yet.
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rockyit98
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finding gallium
mercury free thermometers have Galinstan .an alloy of Gallium, if you know some one as a vet , nurse , or doctor, thermometers get
broken all the time so hospitals buy them in bulk so cheap. some times custom agents or security confiscate glass thermometers at the airport .mercury
ones are very dense even if you can't tell them apart
only Galinstan will react with HCl. https://en.wikipedia.org/wiki/Galinstan
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Ubya
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i've not seen a glass termometer in a hospital in at least 10 hears, maybe where you live they still use them
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rockyit98
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| Quote: Originally posted by Ubya | | on the internet yes, it is quite easy, getting a low price for it is a bit harder. i bought mine on ebay, some bought it from galliumsource.com (now
closed), there are many options while mercury is quite hard to find in reasonable quantities and prices |
200$ for a kilo not that much.(The average price in for low-grade gallium was $120 per kilogram in 2016)but when you buy 50g or so it cost much more.
because it need to be ship as a hazardous material for obvious reasons.
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Fery
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I've bought 1 kg of g.r. grade mercury for slightly more than 800 CZK (32 EUR) recently. If possible I would substitute it with less toxic compound in
any reaction no matter of money.
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rockyit98
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| Quote: Originally posted by Ubya | | i've not seen a glass termometer in a hospital in at least 10 hears, maybe where you live they still use them |
i know, but vets still use them because you can fully sterilize them with iPrOH. unlike electronic ones.i seen hospitals use temperature strips.
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subsecret
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Gallium may not be used commercially for amalgams because it's less common than mercury and a little more messy. I've experimented with it some. The
chloride can be prepared by dissolving in nitric acid, precipitating the hydroxide, filtering out, and then adding HCl to make the chloride. Is there
any disadvantage to just using the nitrate?
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fusso
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Because nitrate is strong oxidiser?
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nleslie321
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NaBH4 is so easy to get and cheap i pay like $18 for 100g i dont bother with the huge toxic mess of Al/Hg amalgam.
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monolithic
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What country? It's way more than that in the USA.
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DrIronic101
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Where the hell do you live that NaBH4 costs that little? Here in the US it's not only nearly impossible to find for sale to the average individual,
but it's tremendously expensive.
"Technically, chemistry is the study of matter, but I prefer to see it as the study of change. Electrons—they change their energy levels. Molecules
change their bonds. Elements—they combine and change into compounds. Well, that’s all of life, right? It’s the constant. It’s the cycle.
It’s solution, dissolution, just over and over and over. It is growth, then decay, then transformation." -Walter White on what chemistry is.
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