Experimental Calculated The distortion-interaction model, which is routinely implemented to gain insight into the underlying influences on activation energies, was carried out for the calculated transitions states of 6, 2, 7 and 3, the results of which are shown in Figure (with tabulated values provided in the Supporting Information). Differences in the distortion energies are evident, revealing that that the phenanthroline species 7 and 3 have larger distortion energies than triazines 6 and 2. The distortion energy accounts