Highly efficient modulation of FRET in an orthogonally arranged BODIPY–DTE dyad

Abstract

The photoswitchable boron-dipyrromethene–dithienylethene molecular dyad is introduced as a prototype for the efficient fluorescence intensity modulation on the molecular level. The functionality of the system is based on the photochromism of the dithienylethene, which facilitates an efficient on- and off-switching of a Förster-type intramolecular energy transfer between the photoexcited BODIPY donor and the dithienylethene acceptor moiety. The switching behavior and dynamics of the molecular dyad are monitored by steady state and time-resolved spectroscopic methods. A quenching efficiency of up to 96% in the off-state is observed and explained by a drastically accelerated decay of the boron-dipyrromethene excited state due to the efficient energy transfer despite the orthogonal arrangement of donor and acceptor. An energy transfer time orders of magnitude shorter than the lifetime of the boron-dipyrromethene in the open state is determined.

A single-stranded coordination copolymer affords heterostructure observation and photoluminescence intensification

“…The distinctive bell curve emerges as N increases, and similarity to the experimental result is found with N ≥ 70. The PL lifetime spans 1.61 to 2.89 ns (table S2); therefore, the exciton hopping frequency is calculated to be at least 24 to 43 ns −1 , which is consistent with those for precedential pigment multiads ( 50 , 51 ). In summary of this section, the numerical simulation accounts for the PL enhancement in random copolymers Co-1- k , and the existence of fast intrawire exciton migration is also deduced.…”

Molecular photoswitches in aqueous environments

“…358,371 Alternatively, DAEs can be used to construct systems for (internal) fluorescence quenching via FRET in one but not the other photoisomer when covalently linked to a suitable fluorophore. 377 3.3.2 Dimethyldihydropyrene. The dimethyldihydropyrenecyclophanediene (DHP-CPD, Fig.…”

Investigating supramolecular systems using Förster resonance energy transfer

“…149 Secondly, increasingly more switchable fluorophores are being developed. Molecules and nanoparticles whose fluorescence can be switched on or off upon irradiation 151–153 will surely benefit future conformational mapping studies, but are also finding applications in FRET-based switching and amplification of optical signals. 154 In addition to physically changing the behavior of a fluorophore, spectral unmixing through advanced FRET signal observation technologies is a highly active field of research.…”