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Author: Subject: Pretty Pictures (2)
greenlight
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[*] posted on 4-6-2015 at 19:17


Very nice purple on the zipper reaction!
I purchased the powder dyes online and it did not specify on the listing or the packaging what type of exact dye they were.
I am fairly sure the yellow is solvent yellow 33 dye and the blue could be solvent blue dye 35 or 36.
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DFliyerz
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[*] posted on 5-6-2015 at 09:55


Some interesting crystals when I was decarboxylating salicylic acid to phenol, and an odd precipitate in my wash/waste bin (I think it may have been in part from the reaction of sucrose, sodium hydroxide, and copper sulfate, but the strange lumps on the bottom and lack of Rochelle's salt say otherwise.)

https://feen.us/k396.jpg
https://feen.us/4af1.jpg
(Too large to embed!)

[Edited on 6-5-2015 by DFliyerz]
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[*] posted on 5-6-2015 at 14:36


Wow, interesting crystals!
Maybe the orangish red precipitate is copper (I) oxide?




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[*] posted on 7-6-2015 at 13:39


Cool! The Zipper reaction looks great. Like to try it sometime.



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[*] posted on 7-6-2015 at 13:43


And so you shall TVC !



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[*] posted on 7-6-2015 at 17:24


What? Oh, is it common in college or something? Definitely looking forward to AP Chem & AP Bio and Calc AB next year (Junior in HS).



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Brain&Force
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[*] posted on 8-6-2015 at 16:04


Back on track guys

<blockquote class="twitter-tweet" lang="en"><p lang="da" dir="ltr">Lanthanides, part 2: dysprosium and ytterbium <a href="https://twitter.com/hashtag/realtimechem?src=hash">#realtimechem</a> <a href="http://t.co/VyyFL8OIW7">pic.twitter.com/VyyFL8OIW7</a></p>&mdash; Brain&amp;Force (@brainandforce) <a href="https://twitter.com/brainandforce/status/608061459373948928">June 9, 2015</a></blockquote> <script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script>




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mayko
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[*] posted on 8-6-2015 at 17:19


I made some iodoform recently, and recrystallized half of it from alcohol. The other half I tried to dry crude, and the base remaining on it appears to have caused it to decompose and release iodine - the filter paper and jar were stained brown. Now, though, there are these lovely formations growing on the lye I was using as a desicant!

LyeBerries.jpg - 2.9MB


Here's the conifer gall of a Gymnosporangium juniperi-virginianae . This fungus spends half its life cycle on apple trees, and the other half on junipers.



apple_cedar_rust.jpg - 2.4MB




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DFliyerz
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[*] posted on 9-6-2015 at 08:49


Quote: Originally posted by Pinkhippo11  
Wow, interesting crystals!
Maybe the orangish red precipitate is copper (I) oxide?


I was kind of thinking that too, but the color of the clumps and the chemicals in there don't really match.
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[*] posted on 10-6-2015 at 10:34


@Mayko,
Isn't iodoform yellow?




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[*] posted on 10-6-2015 at 10:55


Quote: Originally posted by PHILOU Zrealone  
@Mayko,
Isn't iodoform yellow?


Yes, but if it's contaminated with iodine, it would probably have that icky brown colour.




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mayko
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[*] posted on 10-6-2015 at 11:23


Quote: Originally posted by DraconicAcid  
Quote: Originally posted by PHILOU Zrealone  
@Mayko,
Isn't iodoform yellow?


Yes, but if it's contaminated with iodine, it would probably have that icky brown colour.


Yes - and that's a picture of the NaOH I was using as a desiccant; sorry if I was unclear.




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[*] posted on 10-6-2015 at 11:55


Nice photos. What method did you use to produce the iodoform? (And, just curious, what does iodoform smell like?)



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[*] posted on 10-6-2015 at 17:49


extract from flowers.

flors.jpg - 82kB
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[*] posted on 12-6-2015 at 05:12


Quote: Originally posted by mayko  
Quote: Originally posted by DraconicAcid  
Quote: Originally posted by PHILOU Zrealone  
@Mayko,
Isn't iodoform yellow?


Yes, but if it's contaminated with iodine, it would probably have that icky brown colour.


Yes - and that's a picture of the NaOH I was using as a desiccant; sorry if I was unclear.

What was your process for CHI3?

I2 is soluble in brown in ethanol.
--> Was your recrystallization solvent orange-brown?

In a little chloroform I2 colours the solution in violet-purple.
That would prove some I2 formation.

If some of the NaOH has decomposed the iodoform or an intermediary compouns into I(-)...then NaI complexes iodine as brown-orange NaI3.

Alternatively ethanol may be oxydised by iodine into ethanal (what is subject to iodoform reaction)...ethanal will polymerize into orange-Brown tarry material upon exposure to strong base like lye (NaOH).




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[*] posted on 12-6-2015 at 12:49


<a title="By brainandforce (Own work) [CC0], via Wikimedia Commons" href="https://commons.wikimedia.org/wiki/File%3AHolmium_shards.jpg"><img width="512" alt="Holmium shards" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/38/Holmium_shards.jpg/512px-Holmium_shards.jpg" width=800 /></a>

I uploaded my first image to Wikimedia Commons, these are holmium shards.

[Edited on 12.6.2015 by Brain&Force]




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[*] posted on 12-6-2015 at 14:30


Some pretty *disgusting* pictures, an extraction after a pdc oxydation (pyridinium dichromate). This reaction is such a pain in the @ to clean. And that is before I tried to wash it. It became worst when I started rubbing it with a brush, the crap stretched accross the glassware -_-



pdc1.jpg - 69kB pdc 2.jpg - 66kB

[Edited on 12-6-2015 by alexleyenda]




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[*] posted on 13-6-2015 at 12:50


Nice! What procedure was used?
What's the gunk made of? Is it the product, or chromium junk?




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[*] posted on 16-6-2015 at 01:46


Sodium salt of 1-hydroxy-2-naphthoyl-o-benzoic acid

Precursor to series of fluorescent dyes

Looks just like liquid gold

When dissolved in water gives deep olive-green solution

IMG_0423.JPG - 219kB
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[*] posted on 16-6-2015 at 07:13


Quote: Originally posted by plastics  
Sodium salt of 1-hydroxy-2-naphthoyl-o-benzoic acid

Precursor to series of fluorescent dyes

Looks just like liquid gold

When dissolved in water gives deep olive-green solution


Interresting! What are you going to make?




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[*] posted on 17-6-2015 at 08:51


Manganese (II) Chloride, recrystallization test sample out of batch.
It is such a deliquescent bitch, redissolving whenever it rained. This came out of about a week in a desiccant bag.
The single crystals at the beginning were much prettier but I didn't want to risk taking it out.

mncl2_1.jpg - 414kB
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[*] posted on 17-6-2015 at 19:22


Quote:

(And, just curious, what does iodoform smell like?)


A little like chloroform, but maybe more astringent. During preparation, there is a much stronger smell, a nauseating, cloying sweet smell, dissimilar to chloroform; this smell seems to remain with the aqueous layer.


Quote:

What was your process for CHI3?


I dissolved iodine in acetone and added sodium hydroxide solution.


Quote:

I2 is soluble in brown in ethanol.
--> Was your recrystallization solvent orange-brown?


It was a deep orange-yellow, but not so strong I suspected leftover iodine. The decomposition was striking: I put both samples into desiccators, the crude stuff as lumps, the pure stuff as crystals. They appeared identical colors. A day later, the crystals were fine; the lumps had turned a dark brown, almost black, which had stained the filter paper holding them.

Chloroform is reactive with base (I had vague memories of this being important when making it from bleach and acetone; the product is to be removed in a timely manner otherwise it will decay) but it isn't clear how a base would convert a haloform to a halogen.




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[*] posted on 19-6-2015 at 16:03


I like those crystals pyro!
Here are a few of my own, these are vanillic acid being recrystallized:

Remnants:

96SVaFZ.jpg - 666kB

And the final drying crystals:

2k5Evc5.jpg - 1.5MB







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[*] posted on 20-6-2015 at 18:46


"deliquescent bitch"
Lol, would make a BA band name, or a great pompous curse word to use on certain foul womenfolk :P




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[*] posted on 21-6-2015 at 20:14


Quote: Originally posted by The Volatile Chemist  
Nice! What procedure was used?
What's the gunk made of? Is it the product, or chromium junk?

The procedure could not be more simple, PDC with the molecule to oxidize in a solvent, the junk is probably chromium junk.




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