title: A spectrophotometric and thermodynamic study of the charge-transfer complexes of N-aryl-N'-isopropyloxycarbonylsulfamides with DDQ and TCNE.
abstract: 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.
authors: Laboratoire de Chimie Physique, Université 08 Mai 45, BP401, Guelma 24000, Algeria.
authors: Moufida
authors: M
authors: Belfaragui
authors: Achour
authors: A
authors: Seridi
authors: Jean-Yves
authors: JY
authors: Winum
authors: Mohamed
authors: M
authors: Abdaoui
authors: Mekki
authors: M
authors: Kadri
mesh_terms: D000042:Absorption; D016227:Benzoquinones / Q000737:chemistry*; D002725:Chloroform / Q000737:chemistry; D004583:Electrons; D005030:Ethylenes / Q000737:chemistry*; D007700:Kinetics; D009570:Nitriles / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013449:Sulfonamides / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D016227:Benzoquinones; D005030:Ethylenes; D009570:Nitriles; D012997:Solvents; D013449:Sulfonamides; C000928:dichlorodicyanobenzoquinone; D002725:Chloroform; C003393:tetracyanoethylene