Wang and coworkers reported a FRET-capable supramolecular polymers based
on a boron-dipyrromethene (BODIPY)-bridged pillar[5]arene dimer with BODIPY
guests for mimicking the light-harvesting system of natural photosynthesis [43].
Herein, two guest molecules were synthesized with bis-binding sites and tri-binding
sites for pillar[5]arene, thus constructing the AA/BB-type and A 2 /B 3 -type supramolecular polymers. Due to the overlap between the emission band of host molecules
and the absorption band of guest molecules, the fluorescence (or Förster) resonance
energy transfer (FRET) could be occurred, and the transfer efficiency was calculated
to be 51% and 63%, respectively. This was the first example of pillar[5]arene-based
supramolecular polymers for mimicking the light-harvesting system.
Tian and coworkers reported an emission-tunable supramolecular polymer by
changing metal ion types or using mixed metal ions (Fig. 25) [44]. Firstly, the
Fig. 25 Schematic depiction
of the fluorescent
supramolecular
hyperbranched polymer
prepared from monomer B 3 ,
AC, and metal ion by
orthogonal self-assembly.
(Reprinted with permission
from Ref. [44]. Copyright ©
2018, John Wiley and Sons)
13 Pillararene-Based Supramolecular Polymer
373
on a boron-dipyrromethene (BODIPY)-bridged pillar[5]arene dimer with BODIPY
guests for mimicking the light-harvesting system of natural photosynthesis [43].
Herein, two guest molecules were synthesized with bis-binding sites and tri-binding
sites for pillar[5]arene, thus constructing the AA/BB-type and A 2 /B 3 -type supramolecular polymers. Due to the overlap between the emission band of host molecules
and the absorption band of guest molecules, the fluorescence (or Förster) resonance
energy transfer (FRET) could be occurred, and the transfer efficiency was calculated
to be 51% and 63%, respectively. This was the first example of pillar[5]arene-based
supramolecular polymers for mimicking the light-harvesting system.
Tian and coworkers reported an emission-tunable supramolecular polymer by
changing metal ion types or using mixed metal ions (Fig. 25) [44]. Firstly, the
Fig. 25 Schematic depiction
of the fluorescent
supramolecular
hyperbranched polymer
prepared from monomer B 3 ,
AC, and metal ion by
orthogonal self-assembly.
(Reprinted with permission
from Ref. [44]. Copyright ©
2018, John Wiley and Sons)
13 Pillararene-Based Supramolecular Polymer
373