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A Thermodynamic Study of Charge Transfer Complexes of C60 and Some Macrocyclic Ligands

Journal: Journal of Chemistry and Applied Biochemistry (Vol.1, No. 2)

Publication Date:

Authors : ;

Page : 1-8

Keywords : Charge transfer; C60; Stability constant; Macrocyclic ligand; Thermodynamic parameters;

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4 and Schiff base crown ethers 5 and 6 was studied in toluene using UV/ Vis spectrophotometry at five different temperatures. The values of stability constant (Kc) for each complex were determined using Benesi-Hildebrand equation. The obtained Kc values were found to depend on the cavity size, the macrocyclic effect and the substituents on the host. All complexes were found to have 1:1 stoichiometry as obtained by Job’s plot method. In addition, the enthalpy and the entropy of complexation were estimated for all complexes. The complexation between C60 and Ligands 1, 2 and 4 are enthalpy favored and entropy unfavored, while the complexation with 3, 5 and 6 are enthalpy unfavored and entropy favored.

Last modified: 2015-06-23 15:40:57