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• W2473651756 abstract "The present paper reports the spectroscopic investigations on the complexation of Cu(II) with two macrocyclic ligands bonded to [60]Fullerene (L1 and L2) measured in N-methylpyrrolidone (NMP) as solvent. On the basis of UV–vis-NIR spectroscopy applying Jobs method of continuous variation, typical 1:1 stoichiometries were established for the complexes of Cu(II) with L1, and L2. DFT calculations suggested that superior HOMO distributions spread over the nitrogen-donor (as well as somehow oxygen- donor in L2) groups of L1 and L2 macrocycles were the key factor for the observed Kb value enhancement. Thermodynamic stabilities for these complexes have also been determined employing Benesi-Hildebrand equation and the results were compared in terms of their calculated binding constants (Kb). These measurements showed that L1 and L2 bound to these cations stronger than their parent free macrocyclic ligands 1 and 2, respectively. Furthermore, Kb values found for L2 complexes revealed that it could coordinate Cu(II) cation better than L1. Thermodynamic parameters (ΔG, ∆ H, and − ΔS) derived from Van't Hoff equation showed that L1 and L2 coordination of Cu(II) cation were occurred due to both enthalpic and entropic factors while the coordination of Cu(II) with their parent macrocyclic ligands 1 and 2 only enjoyed from only enthalpic advantages." @default.
• W2473651756 created "2016-07-22" @default.
• W2473651756 creator A5006715228 @default.
• W2473651756 creator A5052622111 @default.
• W2473651756 date "2016-12-01" @default.
• W2473651756 modified "2023-09-29" @default.
• W2473651756 title "Spectroscopic evidence on improvement in complex formation of O 2 N 2 aza-crown macrocyclic ligands with Cu(II) acetate upon incorporation with [60]Fullerene" @default.
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• W2473651756 doi "https://doi.org/10.1016/j.saa.2016.06.047" @default.
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