Laeb. De Carvalho et al., Conformational study of 1,2-diaminoethane by combined ab initio MO calculations and Raman spectroscopy, J MOL STRUC, 483, 1999, pp. 639-646
A conformational analysis of the linear polyamine 1,2-diaminoethane was per
formed by both Raman spectroscopy and ab initio SCF-MO methods (with and wi
thout inclusion of water solvent effects). Ten different conformers were de
tected by ab initio calculations, the most stable ones being TGG' and GGG'.
When considering the solvent, the conformations having a higher dipole mom
ent were found to be favoured over the less polar ones. The Raman spectra o
f this amine obtained for the pure liquid, the aqueous solution and the sol
id sample, allowed to conclude that its conformational preferences are dete
rmined by the relative importance of intra- versus intermolecular hydrogen
bonds. (C) 1999 Elsevier Science B.V. All rights reserved.