Spectroscopic Evidence for Excitonic Localization in Fractal Antenna Supermolecules

Kopelman, Raoul; Shortreed, Michael R.; Shi, Zhu‐Pei; Tan, Weihong; Xu, Zhen; Moore, Jeffrey S.; Bar-Haim, Arie; Klafter, J.

doi:10.1103/physrevlett.78.1239

Cited by 284 publications

(375 citation statements)

References 8 publications

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“…Although the enhanced effect that stems from many identical end groups being present simultaneously at the same place is of great importance, the combination of utilizing the multivalency and the precise architecture as an active framework able functioning more than just a scaffold, opens the way for novel and exciting dendrimeric devices. Two such concepts that conceal both the multivalency and the active framework features are the use of dendrimers as light harvesting antennae [19][20][21][22], and as molecular amplifiers [7,21,23,24]. The latter use of dendrimers is based on disintegrating the dendrimeric skeleton into its subunits, thus releasing all of its functional end-groups as a result of a signal initiated at the core of the dendrimer.…”

Section: Figurementioning

confidence: 99%

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Some new aspects of dendrimer applications

Flomenbom

Amir

Shabat

et al. 2005

Journal of Luminescence

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Dendrimers are characterized by special features that make them promising candidates for many applications. Here we focus on two such applications: dendrimers as light harvesting antennae, and dendrimers as molecular amplifiers, which may serve as novel platforms for drug delivery. Both applications stem from the unique structure of dendrimers. We present a theoretical framework based on the master equation within which we describe these applications. The quantities of interest are the first passage time (FPT) probability density function (PDF), and its moments. We examine how the FPT PDF and its characteristics depend on the geometric and energetic structures of the dendrimeric system. In particular, we investigate the dependence of the FPT properties on the number of generations (dendrimer size), and the system bias. We present analytical expressions for the FPT PDF for very efficient dendrimeric antennae and for dendrimeric amplifiers. For these cases the mean first passage time scales linearly with the system length, and fluctuations around the mean first passage time are negligible for large systems. Relationships of the FPT to light harvesting process for other types of system-bias are discussed.

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Section: Figurementioning

confidence: 99%

“…In recent years efforts have been devoted to create and manipulate molecular scale systems that can be used as efficient light harvesting antennae [15][16][17][18][19][20]22]. Dendrimers, due their special architecture, have been proposed as candidates for serving as antennae.…”

Section: Dendrimers As Light Harvesting Antennaementioning

confidence: 99%

Some new aspects of dendrimer applications

Flomenbom

Amir

Shabat

et al. 2005

Journal of Luminescence

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“…[11][12][13] Understanding the electronic excitations of these segments should be the first step in analyzing the dendrimer spectra. In this section we examine the linear (parasubstituted) molecules denoted Pn with n ) 1, 2, 3, 7 repeat units (triple bonds) and the M7 molecule made of linear P1, P2, P3 segments connected at the meta-position with overall n ) 7 repeat units (see Figure 3).…”

Section: Collective Electronic Excitations In Linear Oligomersmentioning

confidence: 99%

“…To calculate the absorption spectra of dendrimers [11][12][13] we modeled family A as a collection of P1 chromophores. The spectra will thus only show one low-frequency peak a1 whose intensity will increase with growing molecular size.…”

Section: Spectra and Energy Funneling In Dendrimersmentioning

confidence: 99%

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Localized Electronic Excitations in Phenylacetylene Dendrimers

1998

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Electron-hole pairs created upon optical excitation of conjugated dendrimers (fractal antenna macromolecules) are shown to be localized within segments connected by benzene rings substituted at the meta-position. The absorption spectra of two families of dendrimers are analyzed using collective electronic normal modes representing the changes in charge and bond-order distributions induced by the optical field. The present approach may be used in the design of artificial light-harvesting antennae with controlled energy-funneling pathways.

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Dendritische Pseudorotaxane

1998

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Selbstorganisation ist der Schlüssel zu einer Reihe dendritischer Pseudorotaxane, die sich in guten Ausbeuten aus komplementären Bausteinen aufbauen lassen: aus einem dreiarmigen, dreifach geladenen Ammoniumsalz und aus Benzylether‐Dendronen der ersten bis dritten Generation, die die Dibenzo[24]krone‐8‐Einheit enthalten. Das Pseudorotaxan mit dem Dendron der dritten Generation ist im Bild schematisch dargestellt.

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Spectroscopic Evidence for Excitonic Localization in Fractal Antenna Supermolecules

Cited by 284 publications

References 8 publications

Some new aspects of dendrimer applications

Some new aspects of dendrimer applications

Localized Electronic Excitations in Phenylacetylene Dendrimers

Dendritische Pseudorotaxane

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