Other than triarylamines, which are protonated by strong acids both at their N-atom and aromatic rings, pyrrole its N-substituted derivatives were exclusively the carbon atoms of heteroaromatic rings. Whereas with trifluoromethane sulfonic acid (TFS) stable pyrrolium salts obtained, weaker trifluoroacetic (TFA) oligomers formed. E.g., from N-(tert-butyl)pyrrole a dimeric compound could be unamb...

Improvement in sensing layer properties of quartz crystal microbalance (QCM) sensors are crucial developing gas with high sensitivity and selectivity. In this work, we study the use chitosan thin film as on a QCM sensor to identify presence volatile organic compounds specifically isopropyl alcohol (IPA). The effect dissolved different acetic acid concentrations towards overlay performance were ...

Mass Spectrometry The ionization of N-protonated Verapamil by electrospray (ESI) is investigated in the Communication (e202116794) W. Scott Hopkins et al. using differential mobility spectrometry (DMS). spectral behaviour caused protonation-induced chirality.