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Chemistry Forums for Students => Organic Chemistry Forum => Organic Spectroscopy => Topic started by: stb05 on May 23, 2016, 04:04:25 PM

Title: Substance, NMR, IR, MS
Post by: stb05 on May 23, 2016, 04:04:25 PM

Can somebody please help me with this substance?
I have to find out what it is because its a task in my university.
Sorry for my bad english, i'm from Austria.
I have a H-NMR, C-NMR, IR and a MS - Spectrum

i hope somebody can help me.

Title: Re: Substance, NMR, IR, MS
Post by: Dan on May 23, 2016, 05:42:28 PM

The MS is missing.

What are your ideas so far?

Title: Re: Substance, NMR, IR, MS
Post by: stb05 on May 24, 2016, 03:39:13 AM

Sorry i uploaded the CNMR a second time accidentally.
Here is the MS.
Ich have absolutely no idea what it could be.. thats why i posted it here.
I also know that the melting point is about 214-218°C

Title: Re: Substance, NMR, IR, MS
Post by: Dan on May 24, 2016, 04:40:17 AM

Quote from: stb05 on May 24, 2016, 03:39:13 AM

Ich have absolutely no idea what it could be.. thats why i posted it here.

You must show you have attempted the question, that is a Forum Rule (http://www.chemicalforums.com/index.php?topic=65859.0).

What do the spectra tell you? How many C environments, how many H environments?

Also, what type of MS technique was used?

Title: Re: Substance, NMR, IR, MS
Post by: stb05 on May 24, 2016, 05:15:41 AM

I dont know which ms technique was used but i think its the most common one.
The c-nmr is a ATP technique.
I can see 4 peaks, 3 of them have 1 or 3 H's and one has none or two.
In the hnmr i can See that there are 10 Protons in a ratio of 2:4:4 so maby 2 benzene rings.
Or its 1:2:2 Than maybe just one benzene Ring.
But i cant figure out the substitution of the benzene.
The mass is 178 so i think there is also no nitrogen

I really tried to solve this a hole day.
Thats why i really need help.

Title: Re: Substance, NMR, IR, MS
Post by: Babcock_Hall on May 24, 2016, 09:37:23 AM

You might try applying the rule of 12 on the molecular ion in the mass spectrum.

Title: Re: Substance, NMR, IR, MS
Post by: MOTOBALL on May 24, 2016, 08:00:40 PM

Why does the MW = 178 tell you that there is no Nitrogen ?

Title: Re: Substance, NMR, IR, MS
Post by: stb05 on May 25, 2016, 02:47:58 AM

Its anthracene
I solved it with some other spectra from scifinder.

Thank you everyone for the help