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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: lalapsycho on October 28, 2012, 03:37:38 PM

Title: GC/MS Autotune with PFTBA
Post by: lalapsycho on October 28, 2012, 03:37:38 PM

I have the autotune chromatgram that was printed after the autotune was complete, tuning using PFTBA, structure (CH3CH2CH2CH2)3N.

3 peaks came off at m/z 69, 219, and 502.

My professor identified the 69 peak as CF3 and asked that we identify what the other peaks were in relation to the structure. I would just like to understand why the 69 peak is in relation to the CF3 of the molecule. Is it just in relation to the mass..16+ (19*3)? Using the atomic masses...

Title: Re: GC/MS Autotune with PFTBA
Post by: lalapsycho on October 28, 2012, 09:24:12 PM

I figured it out! :)

Title: Re: GC/MS Autotune with PFTBA
Post by: rose55 on November 09, 2012, 03:44:37 AM

Yes, it is related to mass but actually 12+(3*19)=69 :)

Title: Re: GC/MS Autotune with PFTBA
Post by: JGK on November 09, 2012, 02:02:36 PM

Quote from: lalapsycho on October 28, 2012, 03:37:38 PM

I have the autotune chromatgram that was printed after the autotune was complete, tuning using PFTBA, structure (CH3CH2CH2CH2)3N.

3 peaks came off at m/z 69, 219, and 502.

My professor identified the 69 peak as CF3 and asked that we identify what the other peaks were in relation to the structure. I would just like to understand why the 69 peak is in relation to the CF3 of the molecule. Is it just in relation to the mass..16+ (19*3)? Using the atomic masses...

It would also help if you had given the correct formula for PTFBA (N(CF₂CF₂CF₂CF₃)₃