Structurally Informative Isotopic Shifts in Ion Mobility Spectra for Heavier Species was written by Pathak, Pratima;Baird, Matthew A.;Shvartsburg, Alexandre A.. And the article was included in Journal of the American Society for Mass Spectrometry in 2020.HPLC of Formula: 615-55-4 This article mentions the following:
The isotopic mol. envelopes due to stable isotopes for most elements were a staple of mass spectrometry since its origins, often leveraged to identify and quantify compounds However, all isomers share one MS envelope. As the mol. motion in media also depends on the isotopic composition, separations such as liquid chromatog. (LC) and ion mobility spectrometry (IMS) must also feature isotopic envelopes. These were largely not observed because of limited resolution, except for the (structurally uninformative) shifts in LC upon H/D exchange. We recently found the isotopic shifts in FAIMS for small haloanilines (∼130-170 Da) to hinge on the halogen position, opening a novel route to isomer characterization. Here, we extend the capability to heavier species: dibromoanilines (DBAs, ∼250 Da) and tribromoanilines (TBAs, ∼330 Da). The 13C shifts for DBAs and TBAs vary across isomers, some changing sign. While 81Br shifts are less specific, the 2-D 13C/81Br shifts unequivocally differentiate all isomers. The trends for DBAs track those for dichloroanilines, with the 13C shift order preserved for most isomers. The peak broadening due to merged isotopomers is also isomer-specific. The absolute shifts for TBAs are smaller than those for lighter haloanilines, but differentiate isomers as well because of compressed uncertainties. These results showcase the feasibility of broadly distinguishing isomers in the more topical ∼200-300 Da range using the isotopic shifts in IMS spectra. In the experiment, the researchers used many compounds, for example, 3,4-Dibromoaniline (cas: 615-55-4HPLC of Formula: 615-55-4).
3,4-Dibromoaniline (cas: 615-55-4) belongs to organobromine compounds. A variety of minor organobromine compounds are found in nature, but none are biosynthesized or required by mammals. Organobromine compounds have fallen under increased scrutiny for their environmental impact. Bromine-containing agents predominate because not only are they more efficient than similar chlorine-containing species, but also the high atomic weight of bromine ensures that it is present in a high mass fraction within most organobromine compounds.HPLC of Formula: 615-55-4
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary