Melatonin charge transfer complex with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone: Molecular structure, DFT studies, thermal analyses, evaluation of biological activity and utility for determination of melatonin in pure and dosage forms

2017 ◽  
Vol 182 ◽  
pp. 143-159 ◽  
Author(s):  
Gehad G. Mohamed ◽  
Maher M. Hamed ◽  
Nadia G. Zaki ◽  
Mohamed M. Abdou ◽  
Marwa El-Badry Mohamed ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Biological Activity ◽  
Charge Transfer ◽  
Charge Transfer Complex ◽  
Thermal Analyses ◽  
Dosage Forms ◽  
Dft Studies

scholarly journals Application of Certain π-Acceptors for the Spectrophotometric Determination of Alendronate Sodium in Pharmaceutical Bulk and Dosage Forms

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Asad Raza ◽  
Muhammad Zia-ul-Haq
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Complex ◽  
Heating Time ◽  
Dosage Forms ◽  
Reagent Concentration ◽  
Alendronate Sodium ◽  
Experimental Conditions ◽  
Spectrophotometric Methods ◽  
Significant Difference

Two simple, fast, and accurate spectrophotometric methods for the determination of alendronate sodium are described. The methods are based on charge-transfer complex formation of the drug with twoπ-electron acceptors 7,7,7,8-tetracyanoquinodimethane (TCNQ) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) in acetonitrile and methanol medium. The methods are followed spectrophotometrically by measuring the maximum absorbance at 840 nm and 465 nm, respectively. Under the optimized experimental conditions, the calibration curves showed a linear relationship over the concentration ranges of 2–10 μg mL−1and 2–12 μg mL−1, respectively. The optimal reactions conditions values such as the reagent concentration, heating time, and stability of reaction product were determined. No significant difference was obtained between the results of newly proposed methods and the B.P. Titrimetric procedures. The charge transfer approach using TCNQ and DDQ procedures described in this paper is simple, fast, accurate, precise, and extraction-free.

scholarly journals DETERMINATION OF TRIMETHOPRIM BY CHARGE-TRANSFER COMPLEX FORMATION

1994 ◽  
Vol 3 (2) ◽  
pp. 132-141
Author(s):  
Mohamed El Balkiny ◽  
Gamal Ragab ◽  
Magda Ayad
Keyword(s):  
Charge Transfer ◽  
Complex Formation ◽  
Charge Transfer Complex

Spectrophotometric and photocatalytic studies of H-bonded charge transfer complex of oxalic acid with imidazole: single crystal XRD, experimental and DFT/TD-DFT studies

2019 ◽  
Vol 43 (23) ◽  
pp. 9039-9051 ◽  
Author(s):  
Ishaat M. Khan ◽  
Kehkashan Alam ◽  
Mohammad Jane Alam ◽  
Musheer Ahmad
Keyword(s):  
Hydrogen Bonding ◽  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Oxalic Acid ◽  
Single Crystal ◽  
Charge Transfer Complex ◽  
Single Crystal Xrd ◽  
Dft Studies ◽  
Td Dft ◽  
Ct Complex

The photocatalytic activity of a new CT complex was tested. Spectrophotometric studies were performed to understand its formation through N+–H⋯O− hydrogen bonding, and the structure was confirmed by single crystal XRD.

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