Structural and vibrational characterisation of 3-amino-1-propanol a concerted SCF-MO ab initio, Raman and infrared (matrix isolation and liquid phase) spectroscopy study
C. Cacela et al., Structural and vibrational characterisation of 3-amino-1-propanol a concerted SCF-MO ab initio, Raman and infrared (matrix isolation and liquid phase) spectroscopy study, SPECT ACT A, 56(6), 2000, pp. 1051-1064
Citations number
21
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Results obtained for the isolated and liquid 3-amino-1-propanol by a concer
ted molecular orbital and vibrational spectroscopic approach are reported.
The relative energies and both structural and Vibrational data of the diffe
rent conformers of the studied compound were calculated using the extended
6-31G* basis set both at the HF-SCF and MP2 ab initio levels of theory and
the theoretical results used to interpret Raman and infrared experimental d
ata. In the gaseous phase and for the molecule isolated in an Argon matrix,
monomeric 3-amino-1-propanol exists as a mixture of conformers, the first
and second lowest energy forms corresponding to conformers which exhibit an
intramolecular OH-N hydrogen bond (forms I and II). On the other hand, in
the pure liquid, where intermolecular H-bonding occurs, the monomeric unit
within the aggregates assumes a conformation similar to that of the third m
ost stable form found for the isolated molecule situation (form III), which
is characterised by having a weak intramolecular NH-O bond. The experiment
al data obtained for the pure liquid also reveals the presence of monomeric
form I in this phase, a result that is in consonance with the strongly sta
bilizing OH-N intramolecular hydrogen bond that is present in this conforme
r. (C) 2000 Elsevier Science B.V. All rights reserved.