o-Phenanthroline

- Overview
  - o-Phenanthroline is a colorimetric reagent for iron detection. It is also used as a reagent for the solvent extraction of anions. This reagent is slightly soluble in water (3.3 g/l at room temperature) and benzene (14 g/l at room temperature), and fairly soluble in alcohol (540 g/l), acetone, and diluted mineral acids. Its proton dissociation constants are reported to be pKa1=0.70 and pKa2=4.98 (μ=0.1, 25°C). o-Phenanthroline forms a red chelate with Fe(II) [logβ3=21.1(μ=0.1, 20°C), λmax=510 nm, ε=1.1x105]. This complex is not easily extracted by organic solvents. The redox potential of FeL33+ -FeL32+ (L: o-phenanthroline) in 1 M H2SO4 is reported to be 1.06 V, and the color of the solution changes from red to pale blue. This reagent also forms colored complexes with Cu, Ni, and Co, and colorless complexes with Cd and Zn. Therefore, o-Phenanthroline can be used as a colorimetric reagent for Cu, Ni, and Co, and as a masking reagent of Cd and Zn. FeL32+ is also utilized for precipitation detection and ion-pair extraction.
    
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- Properties
  - Categories
    
    Ion Analysis
    
    CAS Number
    
    5144-89-8
    
    Molecular Formula
    
    C12H8N2, H2O
    
    Molecular Weight
    
    198.22
    
    Appearance
    
    white crystalline powder
    
    Purity
    
    99.0-101.0% (Titration)
    
    Storage
    
    ambient temperature, protect from metal
    
    Shipping
    
    ambient temperature
    
    * For research use only
- Reference
  - W. W. Brandt, et al., Anal. Chem., 21, 1313 (1949);
    
    C. V. Banks, J. W. O’Langlin, Anal. Chem., 29, 1412 (1957);
    
    R. Pribil, et al., Chemist- Analyst., 48, 87 (1959);
    
    R. Pribil, et al., Collection, 24, 3103 (1959).
    
    H. Veening, et al., Anal. Chem., 32, 1426 (1960);
    
    F. Vydra, et al., Chemist-Analyst, 52, 88 (1963);
    
    A. N. Sevchenko, et al., Izv. Akad. Nauk. SSSR, Ser. Fiz., 27, 710 (1963);
    
    L. I. Kononenko, et al., Zavod. Lab., 30, 779 (1964);
    
    B. W. Bailey, et al., Talanta, 13, 1661 (1966);
    
    R. M. Dagnall, et al., Talanta, 11, 1533 (1964);
    
    R. Pribil, Talanta, 13, 1223 (1966);
    
    K. L. Cheng, K. Ueno, T. Imamura, Handbook of Organic Analytical Reagents, CRC Press Inc., Florida (1982).

MSDS

o-Phenanthroline

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