Jozef Hodyl PhD Thesis - Theses - Flinders University

studies undertaken with the first generation of four armed cyclen derived receptorcomplexes, such as 26. In that work the guests were mostly p-substituted aromaticring molecules with C 2 symmetry, Figure 3.5, as their 1 H NMR spectra have an AA ’BB ’ pattern of resonances whose chemical shifts are suitably removed from those ofthe host complex.Figure 3.5The generic structure of p-substituted aromatic anionic guest species containing ananionic substituent at position X with a different, non-ionic, substituent at Y.In this work a typical pattern of chemical shift changes is seen in the inclusion ofp-nitrophenolate into the cavity of the molecular receptor [Cd(TracHP12)](ClO 4 ) 2 ,49, in DMSO-d 6 , Figure 3.6.BB ’abAA ’cFigure 3.61 H NMR spectra of (a), 10 -3 mol dm -3 sodium p-nitrophenolate, (b), 10 -3 mol dm -3sodium p-nitrophenolate plus 5 x 10 -3 mol dm -3 receptor 49, and, (c), 10 -3 mol dm -3sodium p-nitrophenolate plus 10 -2 mol dm -3 receptor 49. All spectra were obtained inDMSO-d 6 . Host resonances are truncated for clarity.58