The +-Peak in the Mass Spectra of Diamines

Article abstract of DOI:10.1002/hlca.19820650521

The mass spectra of di- and polyamines containing a 1,2-ethandiamine or a 1,3-propandiamine unit are quite often characterized by ⁺-peaks.It is demonstrated that these peaks correspond to a fragment-ion formed by loss of H^. from a formaldehyde-condensation product (e. g. 15) or by loss of CH3^. from a acetalaldehyde-condensation product (e. g. 16) with the diamine.The aldehydes are usually impurities in solvents (especially methanol) used by chromatography, synthesis etc. of the diamines.