In this study, the most stable conformation of 1,4-diaminobutane molecule were determined form the previous works. The geometrical parameters and vibrational frequencies of the most stable conformation of 1,4-diaminobutane were calculated by B3LYP/6-311G(d,p) level of theory. Vibrational frequencies of 1,4-diaminobutane assignment and the Infrared and Raman intensity was determined by means of DFT. Also, the dipole moment, electronegativity, electron affinities etc. of the 1,4-diaminobutane were calculated by using DFT approximation. (C) 2019 Elsevier B.V. All rights reserved.