G. Thirunarayanan, I. Muthuvel, V. Sathiyendiran, Effect of Substituents on Phenazine Derivatives by Spectral Studies, ILCPA Volume 48, International Letters of Chemistry, Physics and Astronomy (Volume 48)
https://www.scipress.com/ILCPA.48.114
Abstract:
    A series of eleven substituted dipyrido[3,2-a; 2<sup>′</sup>,3<sup>′</sup>-c]phenazine derivatives have been synthesized and examined their purities by literature method. The infrared and <sup>13</sup>C NMR spectral data of prepared phenazines were correlated with Hammett substituent constants, F and R parameters using single and multi-regression analysis. From the results of statistical analysis, the effect of substituents on the infrared frequencies (ν, cm<sup>-1</sup>) and <sup>13</sup>C nmr chemical shifts(δ, ppm) has been studied.
Keywords:
    <sup>13</sup>C NMR Spectra, Hammett Substituent Constants, IR Spectra, Phenazines, Spectral Correlations, Swain-Lupton’s Parameter