A spectrophotometric and thermodynamic study of the charge-transfer complexes of N-aryl-N′-isopropyloxycarbonylsulfamides with DDQ and TCNE - Université de Montpellier Accéder directement au contenu
Article Dans Une Revue Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy [1994-...] Année : 2013

A spectrophotometric and thermodynamic study of the charge-transfer complexes of N-aryl-N′-isopropyloxycarbonylsulfamides with DDQ and TCNE

Résumé

Molecular charge-transfer complexes of three N-aryl-N'-isopropyloxycarbonylsulfamides derivatives with π-acceptors tetracyanoethylene (TCNE), and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), were studied by using zero and second order derivative UV spectrophotometry in different solvents at four different temperatures within the range of 20-35 °C. The stoichiometries of the complexes were found to be 1:1 ratio between donors and acceptors using Job's method. The data were analyzed in terms of their stability constant (K), molar extinction coefficient (εCT), thermodynamic standard reaction quantities (ΔG°, ΔH°, ΔS°), oscillator strength (f), transition dipole moment (μEN) and ionization potential (ID). The results show that the stability constant (K) for the complexes was found to be dependant upon the nature of electron acceptor, electron donor, and polarity of used solvents.

Domaines

Chimie

Dates et versions

hal-03617847 , version 1 (23-03-2022)

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Citer

Moufida Belfaragui, Achour Seridi, Jean-Yves Winum, Mohamed Abdaoui, Mekki Kadri. A spectrophotometric and thermodynamic study of the charge-transfer complexes of N-aryl-N′-isopropyloxycarbonylsulfamides with DDQ and TCNE. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy [1994-..], 2013, 108, pp.55-61. ⟨10.1016/j.saa.2013.01.083⟩. ⟨hal-03617847⟩
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