DNA scaffold supports long-lived vibronic coherence in an indodicarbocyanine (Cy5) dimer.

ABSTRACT: Vibronic coupling between pigment molecules is believed to prolong coherences in photosynthetic pigment-protein complexes. Reproducing long-lived coherences using vibronically coupled chromophores in synthetic DNA constructs presents a biomimetic route to efficient artificial light harvesting. Here, we present two-dimensional (2D) electronic spectra of one monomeric Cy5 construct and two dimeric Cy5 constructs (0 bp and 1 bp between dyes) on a DNA scaffold and perform beating frequency analysis to interpret observed coherences. Power spectra of quantum beating signals of the dimers reveal high frequency oscillations that correspond to coherences between vibronic exciton states. Beating frequency maps confirm that these oscillations, 1270 cm^-1 and 1545 cm^-1 for the 0-b

SUBMITTER: Sohail SH 

PROVIDER: S-EPMC8163443 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature