TY - JOUR

T1 - Physicochemical study of the processes of b-cyclodextrin hydrates dehydration

AU - Zelenina, L. N.

AU - Rodionova, T. V.

AU - Chusova, T. P.

AU - Sartakova, A. V.

AU - Manakov, A. Yu

PY - 2024/11/12

Y1 - 2024/11/12

N2 - The research involved synthesizing b-cyclodextrin hydrates of the b-CD·nH2O (n = 11.9–0.9) composition. The obtained compounds were studied by powder X-ray diffraction (XRD), which revealed the transition from a monoclinic unit cell to an orthorhombic one with a decrease in the water content in the samples. The pressure of saturated vapor of the water in the b-CD·nH2O (n = 10.6–7.0) hydrates was measured by static tensimetry with membrane null-manometer over a wide temperature range (293–384 K) under conditions of a quasi-constant hydrate composition. The measured vapor pressure increases in proportion to the increase in the water content of the hydrate samples. The experimental data reduced to a single composition of b-CD·1H2O were approximated by the lnp(1/T) equation, from which the thermodynamic parameters (ΔprH°T and ΔprS°T) of the process of b-cyclodextrin hydrate dehydration were calculated. This information was used to estimate the binding energies of the water molecules to the b-CD framework.

AB - The research involved synthesizing b-cyclodextrin hydrates of the b-CD·nH2O (n = 11.9–0.9) composition. The obtained compounds were studied by powder X-ray diffraction (XRD), which revealed the transition from a monoclinic unit cell to an orthorhombic one with a decrease in the water content in the samples. The pressure of saturated vapor of the water in the b-CD·nH2O (n = 10.6–7.0) hydrates was measured by static tensimetry with membrane null-manometer over a wide temperature range (293–384 K) under conditions of a quasi-constant hydrate composition. The measured vapor pressure increases in proportion to the increase in the water content of the hydrate samples. The experimental data reduced to a single composition of b-CD·1H2O were approximated by the lnp(1/T) equation, from which the thermodynamic parameters (ΔprH°T and ΔprS°T) of the process of b-cyclodextrin hydrate dehydration were calculated. This information was used to estimate the binding energies of the water molecules to the b-CD framework.

KW - Dehydration enthalpy

KW - PXRD

KW - Saturated vapor pressure

KW - Static tensimetry

KW - b-cyclodextrin hydrates

KW - entropy

UR - https://www.mendeley.com/catalogue/d5f5c599-46e5-387d-9695-8df9fd5a59cd/

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85214798812&origin=inward&txGid=e2095f58255380fb54c2b5fd67d3f8ad

U2 - 10.17308/kcmf.2024.26/12435

DO - 10.17308/kcmf.2024.26/12435

M3 - Article

VL - 26

SP - 716

EP - 724

JO - Конденсированные среды и межфазные границы

JF - Конденсированные среды и межфазные границы

SN - 1606-867X

IS - 4

ER -