Wydział Chemii

Jolanta Jóźków

Ryszard Jakubas

Jan Baran

2000

Journal of Molecular Structure

555

273-279

10.1016/S0022-2860(00)00610-4

Naukowa

Angielski

Artykuł

Infrared spectra (4000–500 cm⁻¹) of polycrystalline samples of (C₅H₅NH)₆Bi₄Cl₁₈ were investigated in the temperature range 23–309 K. An assignment of the observed bands at 23 and 309 K is proposed. A temperature dependence study of the frequencies, ν, half-widths, Δν_1/2 and intensities of some internal bands of organic cations confirm the presence of phase transitions at 122 and 154 K. In the low-temperature phases numerous internal modes show splitting that indicates a distinct change in the motional state of the pyridinium cations. The spectroscopic results are consistent with earlier ¹H NMR studies showing that the phase transitions are governed by the in-plane complex motion of the C₅H₅NH⁺ cations.

https://doi.org/10.1016/S0022-2860(00)00610-4

http://www.elsevier.com