The TD-DFT results for A1, A2 and B1 suggest that the drop in absorbance is unrelated to the coupling of their excited states as the chromophore binds the pillar. We then considered the overall structure of the LHC macromolecule, to see what other effects could influence the non-additivity of UV-Vis absorbance in the chromophore. The overall LHC was constructed and optimised using the GFN2-xTB program, using a semi-empirical tight binding GFN2 Hamiltonian along with the analytical linearised Poisson-Boltzmann solvent model using parameters for dichloromethane as a solvent. From the optimised structure, four 𝜋-stacked dimeric chromophore moieties can be identified as labelled in Figure .