Phytol as one of the determinants of chlorophyll interactions in solution

  Optical assimilation and fluorescence ambit of chlorophyll a and the Phytol chlorophyllide a, as able-bodied as of their Mg-depleted derivatives, were compared in a alternation of amoebic solvents. In adverse to prevailing opinion, the ashen backdrop of chlorophyll are not aloof to the abatement of phytol. The cyberbanking assimilation spectra of chlorophyll a and chlorophyllide a alter and affectation a altered assurance on the attributes of the solvent, which cannot be explained alone by the area of a answerable carboxylic accumulation in the adjacency of the π– electron system.  In fact, abstracts in media of capricious basicity appearance that deprotonation of the chargeless carboxylic accumulation in chlorophyllide, i.e., the attendance of a abrogating point allegation abreast the macrocycle, has no aftereffect on colorant assimilation spectra. Analysis of the bread-and-butter aftereffect on the QY energies in agreement of bread-and-butter polarity reveals that the phytyl atom perturbs the ashen appearance of chlorophyll, mainly due to its interactions with the colorant solvation shell.  The phytyl balance ability aswell be appropriately partly complex in authoritative the axial metal articulation in chlorophylls. This access of phytol on the ashen appearance of chlorophyll should be taken into annual if comparing the spectra in band-aid with assorted ashen forms of chlorophyllin vivo.