Conformational and structural studies of 2-fluoroethylamine from temperature dependent FT-IR spectra of krypton and xenon solutions and ab initio calculations

Energy decomposition analysis of gauche preference in 2-haloethanol, 2-haloethylamine (halogen = F, Cl), their protonated forms and anti preference in 1-chloro-2-fluoroethane

Small, electronegative elements contribute more electrostatic and orbital stabilization to the anti → gauche isomerization, and greater steric repulsion. The first and the latter actually oppose our traditional view of conformational equilibria.

Infrared spectra, vibrational assignment, and ab initio calculations for N-bromo-hexafluoro-2-propanimine

The infrared spectra of gaseous and solid N-bromo-hexafluoro-2-propanimine, (CF(3))(2)CNBr, have been obtained from 2000 to 50 cm(-1). The vibrational assignment for the normal modes is proposed based on infrared band contours, group frequencies and normal coordinate calculations utilizing C(s) symmetry. The structural parameters have been obtained from ab initio MP2(full)/6-311+G(d,p) calculations employing the Gaussian-03 program. Additionally, the frequencies and potential energy distributions for the normal modes have been calculated with the MP2(full)/6-31G(d). All of these results are compared to the corresponding data for some similar molecules.