Software Chem & Mat BV, De Boelelaan 1083, NL-1081 HV Amsterdam - Netherlands
 Lucian Blaga Univ Sibiu, Dept Environm Sci Phys Phys Educ & Sport, Ioan Ratiu St 7-9, Sibiu 550012 - Romania
Número total de Afiliações: 5
Tipo de documento:
Journal of Physical Chemistry A;
DEC 13 2018.
Citações Web of Science:
Vibrational circular dichroism (VCD) is a spectroscopic technique used to resolve the absolute configuration of chiral systems. Obtaining a theoretical VCD spectrum requires computing atomic polar and axial tensors on top of the computationally demanding construction of the force constant matrix. In this study we evaluated a VCD model in which all necessary quantities are obtained with density functional based tight binding (DFTB) theory. The analyzed DFTB parametrizations fail at providing accurate vibrational frequencies and electric dipole gradients but yield reasonable normal modes at a fraction of the computational cost of density functional theory (DFT). Thus, by applying DFTB in composite methods along with DFT, we show that it is possible to obtain accurate VCD spectra at a much lower computational demand. (AU)