Structural response of diiodobutenyl-bis-thioquinolinium triiodide to high pressure and theoretical study of mechanical propertiesстатья
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Дата последнего поиска статьи во внешних источниках: 8 октября 2025 г.
Аннотация:The response of the diiodobutenyl-bis-thioquinolinium triiodide crystal structure to hydrostaticcompression from 1 atm to 4 GPa and mechanical stress was studied using experimental techniques(Raman and Brillouin spectroscopy, single-crystal X-ray diffraction) and periodic DFT modeling. A phasetransformation above 2.5(1) GPa manifested itself by abrupt changes in the unit cell parameters and nonmerohedraltwinning. The changes in the band positions in the low-wavenumber region of Raman spectrawere attributed to a change in the bridging hydrogen position in the N⋯H⋯N fragment and to thechanges in the anion. The DFT modeling of the crystal structure on compression revealed the changes inthe structural fragments that can explain why a high-pressure phase transition takes place.