Effect of cyclodextrin modification on complexation thermodynamics with hexadecyltrimethylammonium cation with emphasis on subsequent surfactant micellization

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F24%3A43930875" target="_blank" >RIV/60461373:22340/24:43930875 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0167732224018191?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0167732224018191?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.molliq.2024.125760" target="_blank" >10.1016/j.molliq.2024.125760</a>

Result language

angličtina

Original language name

Effect of cyclodextrin modification on complexation thermodynamics with hexadecyltrimethylammonium cation with emphasis on subsequent surfactant micellization

Original language description

Surfactant-cyclodextrin based complexes, are ideal guest-hosts for fundamental studies since both surfactant hydrophobic region with head group, and cyclodextrin cavity can be systematically varied. This allows, better understanding of the contributions that different chemical entities do to the stabilization of the complex and subsequent surfactant micellization. We studied systematically the interaction of hexadecyltrimethylammonium bromide ([Formula presented]) with native α-, β- and γ-CDs, 2-hydroxypropylated and methylated α- and β-CDs, using isothermal titration calorimetry (ITC), measuring below critical micellization concentration (CMC) at least at three temperatures in the range (288.15 to 318.15) K. Data were treated simultaneously allowing the estimation of thermodynamically consistent temperature dependences of the equilibrium constant, the enthalpy and heat capacity for the inclusion complex formation. The data for cation/CD interaction were analysed mostly by the sequential binding model with 1:1 and 1:2 (cation:CD) stoichiometries, while some cation-CD combinations were examined using only 1:1, or more complicated 1:1, 2:1 and 2:2 stoichiometries. Thermodynamic quantities for complexation are discussed in terms of structural features, their temperature dependence with previous literature being examined. The shift of the CMC in presence of CDs was calculated founding large discrepancies with data in the literature. An extended mass-action chemical equilibrium model is proposed including free surfactant, free CD, complexes of the above mention stoichiometries, also including micelle, surfactant-cyclodextrin complexes of higher order stoichiometry, similar to that found for sodium dodecylsulfate-CDs systems. The new model provides a qualitative match with our own calorimetric titration curves measured above CMC for all studied [Formula presented]/CD combinations, and matches quantitatively with literature CMC values. © 2024 Elsevier B.V.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10406 - Analytical chemistry

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

JOURNAL OF MOLECULAR LIQUIDS

ISSN

0167-7322

e-ISSN

1873-3166

Volume of the periodical

411

Issue of the periodical within the volume

1.10.2024

Country of publishing house

ZA - SOUTH AFRICA

Number of pages

10

Pages from-to

125760

UT code for WoS article

001301630900001

EID of the result in the Scopus database

2-s2.0-85201719465