Chromatography Forum

I received a compound that is a Br salt (HBr) and BrEthanol used in synthesis. I see a unique void volume peak in UV at 210 and in ELSD--not in blank. Area% corresponds roughly with weight% expected for the salt. No peak seen in MS at this RT. Is there anyway to see a peak in MS, or any other way to ID this peak seen in UV and ELSD? I tried infusion of Br-ETOH and don't see anything other than background peaks. Thanks!

I would expect you would see peaks for Bromine in negative ion mode (79 AMU and 81 AMU) if it were present as a salt. Remember there are 2 stable and abundant isotopes so you will see 2 peaks.

You might also see Br3- in neg ion mode.

Br-EtOH might be visible in positive ion mode if you can protonate the OH group.