Molecular antenna

Such dendrons were derivatised at the focal point to create an energy gradient within a kind of molecular antenna (see Chapter 5 for more information) [25]. Percec et al. reported a building block library of eleven phenylacetylenes [27] substituted (dendronised, dendrylated) [26] with - self-assembling - dendrons. 

Figure 5.11. Rigid phenylacetylene dendrimers have been employed as molecular antennas for the directional transduction of energy.

Electron transfer-based molecular antennas 01MI54. 

Figure 2.2 Cartoons of molecular antennae" the movement of charges responsible for emission and absorption of electromagnetic radiation at the molecular level...

The properties of metallodendrimers with a view to their potential applications have been reviewed in [195-197] sensors, binding of small molecules, catalysis, reactive centers, molecular antennas by visible light irradiation. 

Nature produces an abundant supply of carotenes as sacrificial anti-oxidants in living organisms these carotenes have discussed either as molecular antennas [64] or as molecular wires [21]. Carotenes have been used as the pi bridge n between D and A, to yield D-tc-A structures (D = Zn porphyrin, k = carotene, A = anthraquinone). It was seen, however, that both CTR and BCTR occurred at comparable rates, i.e. within a few ps of the laser excitation [64]. 

The carotenes and other conjugated linear polyenes have been touted as "molecular wires" or as "molecular antennas" [21], and certainly will provide fast electronic access to single molecules. These polyenes are, unfortunately, very susceptible to air oxidation (as is the simplest conducting polymer, doped polyacetylene). 

For example, a molecular antenna on one side of the molecule absorbs a photon, another antenna at the opposite end of the molecule emits another photon. 

Luponosov YN, Ponomarenko SA, Surin NM, Borshchev OV, Shumilkina EA, Muztifaiov AM (2009) The first organosilicon molecular antennas. Chem Mater 21 447-455... 

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