March 28, 2024, 05:50:19 PM
Forum Rules: Read This Before Posting


Topic: About reporting of Mass spec rsult involving bromine atom  (Read 3390 times)

0 Members and 1 Guest are viewing this topic.

Offline kamiyu

  • Full Member
  • ****
  • Posts: 181
  • Mole Snacks: +8/-7
  • Gender: Male
About reporting of Mass spec rsult involving bromine atom
« on: August 07, 2014, 04:47:30 PM »
Not sure if I should place a topic here but i am writing my paper and I am stuck with reporting one of my compound that has a bromine on it.

The m/z peaks are 245 and 247, clearly suggesting the presence of bromine and this is correct.

But how about reporting these number ??

Shoudl I say the molecular ion is 245? or 247??? or I should report both?? If so, HOW???

Thanks

Offline rwiew

  • Regular Member
  • ***
  • Posts: 88
  • Mole Snacks: +10/-6
  • Gender: Male
  • MChem, PhD Researcher in Chemical Biology
Re: About reporting of Mass spec rsult involving bromine atom
« Reply #1 on: August 07, 2014, 06:30:30 PM »
You're writing a journal paper? Will depend on the style of the journal of course, see past articles.

Offline clarkstill

  • Chemist
  • Full Member
  • *
  • Posts: 476
  • Mole Snacks: +77/-4
Re: About reporting of Mass spec rsult involving bromine atom
« Reply #2 on: August 08, 2014, 03:33:40 AM »
I was always taught that you give the lowest mass molecular ion, since all the higher peaks are contaminated by the 1% carbon-13, or by any deuterium that might have found its way in from an NMR solvent etc., but if in doubt just give both.

Offline MOTOBALL

  • Full Member
  • ****
  • Posts: 371
  • Mole Snacks: +50/-5
Re: About reporting of Mass spec rsult involving bromine atom
« Reply #3 on: August 08, 2014, 10:17:00 AM »
A common way of handling this is,

"The [M+H]+ ion was observed as an approximately 1:1 doublet at m/z 245, 247 which is consistent with the presence of a single Br atom."

Have you resolved the issue of M +16 and +28 m/z signals that you had mentioned in an earlier post ??

Offline kamiyu

  • Full Member
  • ****
  • Posts: 181
  • Mole Snacks: +8/-7
  • Gender: Male
Re: About reporting of Mass spec rsult involving bromine atom
« Reply #4 on: August 08, 2014, 10:54:35 AM »
Thanks for your reply

M+16 is oxidized molecular ion because the method is ASAP

There is nothing that increases molecular ion by 28. The M+28 that I have is 391m/z which is the plasticizer. (diooctyl phthlate)


Sponsored Links