Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
Journal of Coordination Chemistry
Year: 2008  |  Volume: 61  |  Issue: 19  |  Page No.: 3147 - 3157

Synthesis and pH-sensitive redox properties of 1,10-phenanthroline-5,6-dione complexes

Ying-Ying Kou, Guang-Jun Xu, Wen Gu, Jin-Lei Tian and Shi-Ping Yan    

Abstract: Synthesis and pH-sensitive electrochemical properties of three complexes, [Cu(PD)3] · (ClO4)2 · 2.25CH3CN · 6H2O (1), [Cu(PD)(DMSO)Cl2] · DMSO · H2O (2) and [Co(PD)3] · (ClO4)2 · CH3CN · 2H2O (3) (PD=1,10-phenanthroline-5,6-dione), are reported. Single-crystal X-ray diffraction of the complexes suggest that the structure of 1 is orthorhombic, 2 triclinic and 3 orthorhombic. The electrochemical properties of free PD and the three complexes in phosphate buffer solutions in a pH range between 2 and 9 have been investigated using cyclic voltammetry. The redox potentials of these compounds are strongly dependent on the proton concentration in the range -0.3 V ∼ 0.4 V versus SCE (saturated calomel reference electrode). The reduction behavior of PD can be described from quinone species to semiquinone anion then to the fully reduced dianion. At pH < 4, the reduction of PD proceeds via 2e-/3H+ processes, while at pH > 4, the reduction of PD proceeds via 2e-/2H+. For all complexes, the N-N chelate PD ligand is electrochemically active and underwent step reduction via 2e-/2H+.

View Fulltext    |   Related Articles   |   Back
   
 
 
 
  Related Articles

No Article Found
 
 
 
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility