**3.7 Correlation between global electrophilicity index wCV and Hammett's substituent constants (σp)**

To further extend the generality of the structure–property relationships to the global electrophilicity index wCV calculated from the Cyclic Voltammetry (CV) listed in **Table 1**, we examined correlations wCV vs. σp, wCV vs. *E* and wCV vs. w. As

**Figure 19.**

*Correlations of the global electrophilicity index wCV and global electrophilicity index ω calculated at DFT// B3LYP/6-31 + g(d,p) in acetonitrile for the benzofurazans 1a-f. the values of wCV are given in Table 1 and values of w are given in Table 6.*

*Structure-Property Relationships in Benzofurazan Derivatives: A Combined Experimental… DOI: http://dx.doi.org/10.5772/intechopen.99246*

can be seen, the plotting of the wCV values determined above (see **Table 1**) versus the known Hammett's constant σ<sup>p</sup> values of substituent X gives rise to two separate linear correlations corresponding to a different behavior of Cl, OCH3, OC6H5 groups and morpholinyl, piperidinyl and pyrrolidinyl groups (**Figure 17**).

Similar behaviors have also been obtained when the global electrophilicity index wCV values were plotted against the electrophilicity parameter *E* or the global electrophilicity index w (**Figures 18** and **19**). The reason for this apparent disparity is not clear at this stage. Clearly, more investigate is necessary to explicate this behavior.
