scholarly journals Investigation of Charge Transfer Complexes Formed between Mirtazapine and Someπ-Acceptors

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Hulya Demirhan ◽  
Mustafa Arslan ◽  
Mustafa Zengin ◽  
Mustafa Kucukislamoglu
Keyword(s):  
Charge Transfer ◽  
Dosage Form ◽  
Room Temperature ◽  
Equilibrium Constants ◽  
Formation Constants ◽  
Electron Acceptors ◽  
Spectral Studies ◽  
Charge Transfer Complexes ◽  
Ir And Nmr Spectroscopy ◽  
Ft Ir

Charge transfer complexes (CTC) of mirtazapine with tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), and tetracyanoquinodimethane (TCNQ) have been studied spectrophotometrically in dichloromethane at room temperature. The stoichiometries of the complexes were found to be 1 : 1 ratio by the Job Method between mirtazapine and the acceptors. The equilibrium constants and thermodynamic parameters of the complexes were determined by the Benesi-Hildebrand and Van't Hoff equations. Mirtazapine in pure and dosage form was applied in this study. The results indicate that the formation constants for the complexes depend on the nature of electron acceptors and donor. And also the spectral studies of the complexes were determined by FT-IR and NMR spectroscopy.

A study of the donor properties of the phenoxachalcogenines II: 7,7,8,8-tetracyanoquinodimethane as the acceptor

1980 ◽  
Vol 58 (11) ◽  
pp. 1133-1137 ◽  
Author(s):  
David P. Rainville ◽  
Ralph A. Zingaro ◽  
John P. Ferraris
Keyword(s):  
Free Energy ◽  
Charge Transfer ◽  
Room Temperature ◽  
Charge Transfer Complex ◽  
Equilibrium Constants ◽  
Entropy Change ◽  
Charge Transfer Complexes ◽  
Chalcogen Atom ◽  
Dc Conductivities ◽  
Type Interaction

The phenoxachalcogenines have been studied as donors towards 7,7,8,8-tetracyanoquinodimethane. For the 1:1 complexes studied, the equilibrium constants, K, vary over the range 4–6; the enthalpy, ΔH0, is about −2.0 kcal/mol; the free energy, ΔG0, is −1.4 to −1.0 kcal/mol, and the entropy change, ΔS0, is −7.3 to −3.5 eu. The entropy change is greatest in the case of the dibenzo-1,4-dioxane – 7,7,8,8-tetracyanoquinodimethane charge-transfer complex. This is attributed to the planarity of the dibenzo-1,4-dioxane molecule. The extinction coefficient, εc, for the series studied varies from 115 to 230, and no regularity in the trend has been noted.The lack of any significant changes (with change in the chalcogen atom) in the thermodynamic values for the phenoxachalcogenine – 7,7,8,8-tetracyanoquinodimethane charge-transfer complexes is interpreted in terms of a similar π to π type interaction involving a delocalized π orbital of the phenoxachalcogenine rather than a localized n orbital of the hetero atom.The room temperature four-probe dc conductivities of single crystals of PSe–TCNQ and PS–TCNQ were found to be 4 × 10−8 and 3 × 10−7 ohm−1 cm−1, respectively.

Charge-transfer interaction of bithienyls and some thiophene derivatives with electron acceptors

1976 ◽  
Vol 54 (23) ◽  
pp. 3705-3712 ◽  
Author(s):  
Rafie Abu-Eittah ◽  
Fakhreia Al-Sugeir
Keyword(s):  
Charge Transfer ◽  
Complex Formation ◽  
Molecular Complexes ◽  
Formation Constants ◽  
Electron Acceptors ◽  
Charge Transfer Complexes ◽  
Extinction Coefficients ◽  
Charge Transfer Transitions ◽  
Different Temperatures ◽  
Thiophene Derivatives

The charge transfer complexes of 2,2′-bithienyl, 5,5′-dimethyl-2,2′-bithienyl, and some thiophene derivatives as donors with tetracyanoethylene as an acceptor have been studied spectrophotometrically. In addition, complexes of the first donor with chloranil and iodine have been studied. The formation constants and extinction coefficients of the molecular complexes formed have been determined by graphical as well as iterative methods. From measurements at different temperatures, the thermodynamic functions of the complex formation have been calculated. The ionization potentials of the donors have been obtained from the energies of the charge transfer transitions.

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