Light Harvesting and Energy Transfer in Laser−Dye-Labeled Poly(aryl ether) Dendrimers

Abstract

The photophysical properties of a series of laser-dye-labeled poly(aryl ether) dendrimers, generations 1-4, have been determined. The dendrimers act as extremely efficient light-harvesting antennae capable of transferring light energy through space from their periphery to their core. The light-harvesting ability of these molecules increases with generation due to an increase in the number of peripheral chromophores. The energytransfer efficiency was found to be quantitative for generations 1-3, with only a slight decrease observed for the fourth generation (∼93%). Due to the high extinction coefficients and fluorescence quantum yields of the chromophores and the efficient intramolecular energy transfer of the dendritic assemblies, these macromolecules have the potential to become integral components of molecular photonic devices.

Electrical and magnetic properties of electro-oxidative polymerized poly(tris(thienylphenyl)amine)s

“…However, this spin-spin interaction exists in the polymers explained not by a through bond but by a through space [18,19]. The linear structure of PMeTPA enables close contact between the polymer chains.…”

Investigations of excitation energy transfer and intramolecular interactions in a nitrogen corded distrylbenzene dendrimer system

“…Organic dendrimers 1 have shown great promise for energy funneling processes as well as several other possible applications including light emitting diodes, [2][3][4][5] solid-state organic laser devices, 6 new nanocomposite materials 7 and artificial light-harvesting systems. 8 These applications, and the fundamental physics and chemistry behind novel dendritic macromolecular architectures, have motivated the investigation of the mechanisms involved in the energy transfer processes in novel organic dendrimers.…”

“…6,[17][18][19][20][21][22] Critical works by Aida, 19,21 Moore, 20,22 and Frechet 6 have provided the synthetic basis for the development of useful dendritic architectures for efficient energy transfer. Aida's dendrimer system ͑a poly͑aryl͒ether͒ harvests low-energy photons and transfers the energy to an azobenzene core.…”

Recognition mediated encapsulation and isolation of flavin–polymer conjugates using dendritic guest moieties

“…Various methods have been used to mimic this effective biological insulation of redox-active core moieties for use in artificial enzymes, 2 catalysts, 3 light harvesting systems, 4 construction of insulated molecular wires, 5 light-emitting diodes 6 and fiber optics. 7 Additional efforts have focused on synthetic systems, such as inclusion complexes and dendrimer cages, 8 for applications as data storage units, sensors, catalysts, and magnets.…”