Jozef Hodyl PhD Thesis - Theses - Flinders University

χG∆δ∆δGFigure 3.4 Job's Plot for p-nitrophenolate inclusion in the cavity of [Cd(TracHP12)](ClO 4 ) 2 , 49,showing composition of between 1:1 and 1:2 for the complex defined by a slightasymmetry toward higher χ G .χ GThe barely discernible sharpening of the curve for phenoxyacetate inclusioncompared to p-nitrophenolate inclusion suggests a higher binding constant. This wassubsequently verified quantitatively, and is reported in Section 3.2.5.At a glance the Job’s plot for p-nitrophenolate appears to be symmetrical aboutχ G = 0.5. However, careful inspection of the χ G ∆δ G values reveals that they aregreater between χ G = 0.5 and 1.0, compared to those between χ G = 0 and 0.5. Theappearance of this curve suggests a small contribution from a 1:2 H:G species to asolution that predominantly contains a 1:1 H:G species and is consistent with the 1:2ratio of H:G found in the crystal structure of 76, for which K 2