dangerous amateur
Hazard to Others
Posts: 144
Registered: 8-7-2011
Member Is Offline
Mood: No Mood
|
|
Ethylenediamine with a red tint
I just got some ethylenediamine, wich is hard to get here.
Thing is, this stuff seems to be rather old.
It is not colorless, it has a slight reddish tint.
I do not have experience with this stuff yet, but it is supposed to look like clear water.
It smokes white when it has air contact like it should and it smells like it should.
Do you think it's still OK to use?
How does outdated ethylenediamine look like?
[Edited on 14-7-2012 by dangerous amateur]
|
|
|
Mailinmypocket
International Hazard
Posts: 1351
Registered: 12-5-2011
Member Is Offline
Mood: No Mood
|
|
Dont really know what could be causing the red color, mine is a fairly old bottle and the color is a very light amber... sort of looks like watered
down beer. Its supposed to be colorless though... Either way it has always worked just fine.
Try making some transition metal complexes with it to see if it performs reasonably!
|
|
|
kristofvagyok
National Hazard
Posts: 659
Registered: 6-4-2012
Location: Europe
Member Is Offline
Mood: No Mood
|
|
Quote: Originally posted by dangerous amateur  | I just got some ethylenediamine, wich is hard to get here.
Thing is, this stuff seems to be rather old.
Do you think it's still OK to use?
How does outdated ethylenediamine look like?
[Edited on 14-7-2012 by dangerous amateur] |
Fresh and clear ethylenediamine looks like water, it is smelly as ***** and if it's not like this, it is recommended to distill it from anhydrous KOH.
And it should be stored under argon in a sealed ampoule.
I have a blog where I post my pictures from my work: http://labphoto.tumblr.com/
-Pictures from chemistry, check it out(:
"You can’t become a chemist and expect to live forever." |
|
|
ScienceSquirrel
International Hazard
Posts: 1863
Registered: 18-6-2008
Location: Brittany
Member Is Offline
Mood: Dogs are pets but cats are little furry humans with four feet and self determination! 
|
|
I would not worry about it.
A little coloured material goes a long way.
|
|
|
dangerous amateur
Hazard to Others
Posts: 144
Registered: 8-7-2011
Member Is Offline
Mood: No Mood
|
|
Thanks for your opinions guys.
It's really just a slight tint, watered down beer is a pretty good description.
| Quote: |
Try making some transition metal complexes with it to see if it performs reasonably! |
Can you suggest a certein synthesis that gives a significant result?
|
|
|
Dr.Bob
International Hazard
Posts: 2658
Registered: 26-1-2011
Location: USA - NC
Member Is Offline
Mood: No Mood
|
|
Most amines turn dark over time due to N-oxides, amine carbonate salts, and other decomp. products. It is difficult to tell the extent of purity
without some analytical method or device, but often the color is due to a small impurity. I would not purify something I don't need immediately, as
it will only go bad again, unless you can keep it cold, and under argon or nitrogen.
|
|
|
Mailinmypocket
International Hazard
Posts: 1351
Registered: 12-5-2011
Member Is Offline
Mood: No Mood
|
|
| Quote: |
Try making some transition metal complexes with it to see if it performs reasonably! |
Can you suggest a certein synthesis that gives a significant result?[/rquote]
Sure - give this a try: http://infohost.nmt.edu/~jaltig/CobaltComplex.pdf
It yields a nice crop of glistening, forest green crystals 
You can also try making a similar salt with nickel instead of cobalt
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
