Hive Chemistry Discourse

	Main Index Search Register Login Who's Online FAQ Links
	Main Index Search Register Login Who's Online FAQ Links

	1 Online, 0 Active		You are not logged in

This is a historical archiveThe forum is read-only. Private information has been removed. It is not possible to login.

	Chemistry Discourse	Thread: Previous Forum index Next

All 5 posts Subject: Spectroscopic Analysis of Amines Please login to post Down

Methlaab
(Newbee)
11-08-04 00:34
No 540278
      Spectroscopic Analysis of Amines

Spectroscopic Analysis

* IR - The -N-H should be apparent. -NH one band, -NH2 two bands (symmetric and asymmetric)

Absorbance (cm-1) Interpretation
3500 - 3100 NH stretch
1350 - 1000    C-N stretch

* 1H NMR - The -N-H proton(s) tend to be broad peaks. N is less electronegative than O so it deshields less.

Resonance (ppm)    Interpretation
0.5 - 5.0 (broad, exchangeable) -NH proton
1.5 - 3.0 CH2-NR2

* 13C NMR

C-N typically 35 - 50 ppm (deshielding due to N)
note: the deshielding is less than that observed in alcohols, C-O = 50 - 65 ppm)

*   UV-VIS

   maxima due to n®s* (190 nm)
o n electron from N lone pair
o s* antibonding C-N

*   Mass Spectrometry

Peak for the molecular ion, M+, is usually apparent.
The nitrogen rule : compounds composed of only C, H, O have an even molecular weight.
If a compound contains an odd number of N atoms will have an odd molecular weight. (the Nitrogen rule).
Since N is very good at stabilising positive charge, cleavage at the b-carbon are common.

You say over, Nothing is Over until We decide it is

Methlaab
(Newbee)
11-08-04 00:52
No 540283
      Chromatography

Good link to the The Coupling of Gas and Liquid Chromatography
with Mass Spectrometry

http://www.spectroscopynow.com/Spy/pdfs/JMS34157.pdf

You say over, Nothing is Over until We decide it is

methyl_ethyl
(Guardian)
11-08-04 02:23
No 540306
User Picture       informative

Informative link, although somewhat dated. I wonder what your reason for posting that link in this thread has to do with anything relevent.

Thread: Spectroscopic Analysis of Amines

Your Post: GC/MS LC/MS Theory and Background

Does not mention anything about the analysis of amines. Then again neither does this post. I guess I better dig up some information on the spectroscopic analysis of amines crazy

sorry,

m_e

   Unipolar Mania, It's good for life... laugh

Methlaab
(Newbee)
11-08-04 03:31
No 540326
      ????

* IR - The -N-H should be apparent. -NH one band, -NH2 two bands (symmetric and asymmetric)

Absorbance (cm-1) Interpretation
3500 - 3100 NH stretch
1350 - 1000 C-N stretch


* 1H NMR - The -N-H proton(s) tend to be broad peaks. N is less electronegative than O so it deshields less.

Resonance (ppm)    Interpretation
0.5 - 5.0 (broad, exchangeable) -NH proton
1.5 - 3.0 CH2-NR2

* 13C NMR

C-N typically 35 - 50 ppm (deshielding due to N)
note: the deshielding is less than that observed in alcohols, C-O = 50 - 65 ppm)

*   UV-VIS

   maxima due to n®s* (190 nm)
o n electron from N lone pair
o s* antibonding C-N

*   Mass Spectrometry

Peak for the molecular ion, M+, is usually apparent.
The nitrogen rule : compounds composed of only C, H, O have an even molecular weight.
If a compound contains an odd number of N atoms will have an odd molecular weight. (the Nitrogen rule).
Since N is very good at stabilising positive charge, cleavage at the b-carbon are common.

____________________________________________________________
Don't understand your comment but for you i've marked everything red what is typical for amines, related to spectroscopic analysis

(miss)understand

Nicodem
(Hive Bee)
11-08-04 11:15
No 540398
User Picture       Politeness

I think Methyl_ethyl wanted to say that your two posts Post 540278 (Methlaab: "Spectroscopic Analysis of Amines", Chemistry Discourse) and Post 540283 (Methlaab: "Chromatography", Chemistry Discourse) are unrelated to each other and the second one is therefore off topic since the first one determines the topic of the thread. tongue Anyway, I'm sure he will explain it you much better.

But what I wanted to ask you is:
Why the hell do you post material found on the net inside the posts and without providing the link to the original location, thus not giving credit to the real authors?
That, at least in my personal view, is considered something like being very rude and lacking consideration for other people's work and effort. (Not to mention that on the original sites the formatting is better.)

So, next time you can simply post something like this:
{Insert here your comments on why is this important for The Hive "community" and your personal view on the subject.}

Amines: Spectroscopic Analysis (http://www.chem.ucalgary.ca/courses/351/Carey5th/Ch22/ch22-4.html)

The same goes for Post 540145 (Methlaab: "Ritter and Grignard Reaction. An overview...", Chemistry Discourse) where you (still) did not provide the link to Grignard Reaction / Grignard Reagents (http://www.organic-chemistry.org/frames.htm?http://www.organic-chemistry.org/namedreactions/grignard-reaction.shtm) even though in another thread, Post 540137 (Methlaab: "A short story about amines", Chemistry Discourse), I expressed you that, at least I, miss the link very much.

“The real drug-problem is that we need more and better drugs.” – J. Ott

	https://the-hive.archive.erowid.org	the-hive@erowid.org



Powered by Tea & Milk^TM 1.14 (unregistered), (C) 2022-2023, Despite Cops Happy United
Links Erowid Rhodium

	All 5 posts		Subject: Spectroscopic Analysis of Amines		Please login to post		Down


		Methlaab (Newbee) 11-08-04 00:34 No 540278				Spectroscopic Analysis of Amines
						Spectroscopic Analysis * IR - The -N-H should be apparent. -NH one band, -NH2 two bands (symmetric and asymmetric) Absorbance (cm-1) Interpretation 3500 - 3100 NH stretch 1350 - 1000 C-N stretch * 1H NMR - The -N-H proton(s) tend to be broad peaks. N is less electronegative than O so it deshields less. Resonance (ppm) Interpretation 0.5 - 5.0 (broad, exchangeable) -NH proton 1.5 - 3.0 CH2-NR2 * 13C NMR C-N typically 35 - 50 ppm (deshielding due to N) note: the deshielding is less than that observed in alcohols, C-O = 50 - 65 ppm) * UV-VIS maxima due to n®s* (190 nm) o n electron from N lone pair o s* antibonding C-N * Mass Spectrometry Peak for the molecular ion, M+, is usually apparent. The nitrogen rule : compounds composed of only C, H, O have an even molecular weight. If a compound contains an odd number of N atoms will have an odd molecular weight. (the Nitrogen rule). Since N is very good at stabilising positive charge, cleavage at the b-carbon are common. You say over, Nothing is Over until We decide it is



		Methlaab (Newbee) 11-08-04 00:52 No 540283				Chromatography
						Good link to the The Coupling of Gas and Liquid Chromatography with Mass Spectrometry http://www.spectroscopynow.com/Spy/pdfs/JMS34157.pdf You say over, Nothing is Over until We decide it is



		methyl_ethyl (Guardian) 11-08-04 02:23 No 540306				informative
						Informative link, although somewhat dated. I wonder what your reason for posting that link in this thread has to do with anything relevent. Thread: Spectroscopic Analysis of Amines Your Post: GC/MS LC/MS Theory and Background Does not mention anything about the analysis of amines. Then again neither does this post. I guess I better dig up some information on the spectroscopic analysis of amines sorry, m_e Unipolar Mania, It's good for life...



		Methlaab (Newbee) 11-08-04 03:31 No 540326				????
						* IR - The -N-H should be apparent. -NH one band, -NH2 two bands (symmetric and asymmetric) Absorbance (cm-1) Interpretation 3500 - 3100 NH stretch 1350 - 1000 C-N stretch * 1H NMR - The -N-H proton(s) tend to be broad peaks. N is less electronegative than O so it deshields less. Resonance (ppm) Interpretation 0.5 - 5.0 (broad, exchangeable) -NH proton 1.5 - 3.0 CH2-NR2 * 13C NMR C-N typically 35 - 50 ppm (deshielding due to N) note: the deshielding is less than that observed in alcohols, C-O = 50 - 65 ppm) * UV-VIS maxima due to n®s* (190 nm) o n electron from N lone pair o s* antibonding C-N * Mass Spectrometry Peak for the molecular ion, M+, is usually apparent. The nitrogen rule : compounds composed of only C, H, O have an even molecular weight. If a compound contains an odd number of N atoms will have an odd molecular weight. (the Nitrogen rule). Since N is very good at stabilising positive charge, cleavage at the b-carbon are common. ____________________________________________________________ Don't understand your comment but for you i've marked everything red what is typical for amines, related to spectroscopic analysis (miss)understand



		Nicodem (Hive Bee) 11-08-04 11:15 No 540398				Politeness
						I think Methyl_ethyl wanted to say that your two posts Post 540278 (Methlaab: "Spectroscopic Analysis of Amines", Chemistry Discourse) and Post 540283 (Methlaab: "Chromatography", Chemistry Discourse) are unrelated to each other and the second one is therefore off topic since the first one determines the topic of the thread. Anyway, I'm sure he will explain it you much better. But what I wanted to ask you is: Why the hell do you post material found on the net inside the posts and without providing the link to the original location, thus not giving credit to the real authors? That, at least in my personal view, is considered something like being very rude and lacking consideration for other people's work and effort. (Not to mention that on the original sites the formatting is better.) So, next time you can simply post something like this: {Insert here your comments on why is this important for The Hive "community" and your personal view on the subject.} Amines: Spectroscopic Analysis (http://www.chem.ucalgary.ca/courses/351/Carey5th/Ch22/ch22-4.html) The same goes for Post 540145 (Methlaab: "Ritter and Grignard Reaction. An overview...", Chemistry Discourse) where you (still) did not provide the link to Grignard Reaction / Grignard Reagents (http://www.organic-chemistry.org/frames.htm?http://www.organic-chemistry.org/namedreactions/grignard-reaction.shtm) even though in another thread, Post 540137 (Methlaab: "A short story about amines", Chemistry Discourse), I expressed you that, at least I, miss the link very much. “The real drug-problem is that we need more and better drugs.” – J. Ott

All 5 posts	End of thread	Top