Host-guest interaction into the cage of a supramolecular iron-organic complex - Is the process enthalpically or entropically- driven?

Author(s)

Kfouri, Marta Simao ^[1] ; Reis Andrade, Mariana Martins ^[1] ; Sabadini, Edvaldo ^[1]

Affiliation

^[1] Univ Estadual Campinas, Inst Chem, Dept Phys Chem, POB 6154, BR-13084862 Campinas, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF CHEMICAL THERMODYNAMICS; v. 131, p. 613-619, APR 2019.
• Web of Science Citations: 0

Abstract

We report a calorimetric study of the binding in aqueous solution of some guests (dichloromethane, furan, tetrahydrofuran, 1,4- dioxane and tetrahydropyran) with the cage of the supramolecular iron-organic host ((Fe4L6)-L-II)(4-), where L is formed by 2-formylpyridine and 4,4'-diaminobiphenyl-2,2'-disulfonic acid. This supramolecular iron-organic host has a tetrahedral structure with a cage capable to complex specific guests. The study was carried out by using an isothermal titration calorimeter, allowing the determination of the binding constants between some of the guests with ((Fe4L6)-L-II)(4-). Depending on the molecular nature of the guests their incorporation can be fast or very slow. In this latter case, the rate of energy released during the process was used to determine the kinetic constant for the assemblage between the guests with ((Fe4L6)-L-II)(4-). For the cases of fast encapsulation, the correspondent values for Delta H-298(0), Delta HG(298)(0) and Delta S-298(0) were determined and the thermodynamic driven force was elucidated. (C) 2018 Elsevier Ltd. (AU)

• FAPESP's process: 15/25406-5 - Organizing matter: colloids formed by association of surfactants, polymers and nanoparticles
• Grantee: Watson Loh
• Support Opportunities: Research Projects - Thematic Grants