Electrical and Optical Properties of the Nitramine Group and Molecular Structure of Some N-Nitramines

The electrical and optical properties (dipole moment, electrooptical and optical Kerr constants, molecular polarizability anisotropy, polarizability tensor, molecular refraction) of N,N-dimethylnitramine as the simplest N-NO₂ derivative were studied by a set of experimental and theoretical methods with the aim to determine the components of the polarizability ellipsoid of the N-NO₂ group and develop a valence-optical scheme for calculating the optical and electrooptical parameters of N-NO₂ compounds. Conjugation of the p electrons of the imide nitrogen atom with the electrons of the nitro group results in deviation of the properties of N,N-dimethylnitramine from the additive values. Comparative evaluation of the parameters of the Csp³-NO₂, Csp²-NO₂, and N-NO₂ groups was made.     

Temperature study of Brillouin light scattering in selected dimethacrylates

Selected dimethacrylates forming multifunctional monomers have been studied using Brillouin spectroscopy. The hypersound wave propagation velocity and adiabatic compressibility of the compounds studied have been determined. It has been revealed that these quantities depend on both temperature and the structure of the molecule chain of the monomer. Some characteristic features obtained from the Brillouin study have been discussed in terms of molecular interactions.