Abstract
Realizing a synthetic model for a light-harvesting (LH) antenna is challenging from the viewpoint of elucidating electron transfer processes, high efficiency for electron charge separation, and efficient photo energy usage. The crystal structure of the LH antenna complex (LH2) from the Rhodopseudomonas acidophila strain 10050 shows that the active assembly consists of two concentric cylinders of helical protein subunits enclosing the dimeric pigment molecules. Developing a model compound through noncovalent bonds in water is challenging from the viewpoint of supramolecular architecture. In this study, we successfully prepared a β-cyclodextrin-linked porphyrin zinc complex, and observed the addition of potassium 2-bromo-1,4-naphthoquinone-3-sulfonate to the β-cyclodextrin-linked porphyrin solution and the structure of the complex by means of 1H NMR spectroscopy. Using Job's method, 1:1 stoichiometry was estimated for the system. Moreover, the inclusion complex was discussed in detail.
