Ghazanfar, S. A. S. published the artcileRaman spectra of diamines and diammonium ions: effects of ionization on carbon-hydrogen stretching frequencies, Computed Properties of 10517-44-9, the publication is Journal of the American Chemical Society (1964), 86(4), 559-64, database is CAplus.
Raman spectra are reported for ethylenediamine, 1,3-propanediamine, 1,4- butanediamine, cadaverine, ethanolamine, and their hydrochlorides, and for malonic acid and its disodium salt, in aqueous solution All the amines except 1,4-butanediamine were also studied as pure liquids, and 1,3-propanediamine was also studied in D2ODCl solution after nearly complete conversion of the NH2 to ND2 groups. When one of these diamines dissolves in water the C-H stretching frequencies near 2900 cm.-1 generally increase by 1525 cm. -1 On addition of HCl, with the protonation of the amino groups, there is a further and considerably larger increase in these frequencies, by 35-70 cm. -1 above that of the basic amine in water solution This change is much less marked in ethanolamine, which contains only one amino group. It is relatively small in cadaverine, in which only two of the five methylene groups immediately adjoin amino groups. The upward displacement of the methylene C-H stretching frequencies when a neighboring amino group acquires a pos. charge is in accord with earlier observations on glycine, ¦Â-alanine, and cysteine. The methylene stretching frequencies of malonic acid are displaced downward by 20-25 cm. -1 when the two carboxyl groups lose their protons, although no such effect has been noted in chloroacetic acid when its carboxyl group ionizes. Complete deuteration of an NH2 or NH3+ group has almost no influence on the C-H frequencies of an adjoining methylene group; it is the state of charge of the amino group, not the mass of the attached atoms, that is important. The addition of 3M NaCl has no significant effect on the Raman spectrum of ethylenediamine in aqueous solution; therefore, the observed frequency shifts on protonation of the amino group are not dependent on the large increase in ionic strength that accompanies the addition of acid. The C-H deformation frequencies are, in general, little affected by ionization or deuteration of the amino group, although many frequencies <1400 cm.-1 are of course greatly altered.
Journal of the American Chemical Society published new progress about 10517-44-9. 10517-44-9 belongs to catalysis-chemistry, auxiliary class Salt,Amine,Aliphatic hydrocarbon chain, name is Propane-1,3-diamine dihydrochloride, and the molecular formula is C3H12Cl2N2, Computed Properties of 10517-44-9.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia