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Aggregation-controlled excimer emission from anthracene-containing polyamidoamine dendrimers.

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Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 10, 2010
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Anthracene-modified polyamidoamine (PAMAM) dendrimers form aggregates in acetonitrile-water mixtures, leading to unique pre-arranged structures. These structures enable intense, exclusive excimer emission from anthracene, controllable by aggregation propensity.

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Area of Science:

  • Supramolecular Chemistry
  • Polymer Science
  • Photophysics

Background:

  • Polyamidoamine (PAMAM) dendrimers are highly branched macromolecules with tunable properties.
  • Peripheral modification of dendrimers with chromophores allows for the study of their photophysical behavior.
  • Anthracene moieties are known to exhibit excimer emission, indicative of close proximity.

Purpose of the Study:

  • To investigate the excimer emission of anthracene-modified PAMAM dendrimers.
  • To explore the influence of solvent composition and pH on aggregate formation and excimer generation.
  • To understand the relationship between ground-state aggregation and the types of excimers formed.

Main Methods:

  • Synthesis of lower generation PAMAM dendrimers peripherally modified with anthracene.
  • Fluorescence spectroscopy (steady-state and time-resolved) in acetonitrile-water mixtures.
  • Investigation of pH effects on aggregation and emission properties.

Main Results:

  • Substantial aggregation of anthracene-modified PAMAM dendrimers observed in 15-20 vol% water in acetonitrile.
  • Aggregate formation leads to pre-arranged anthracene units in the ground state, facilitating stable excimer formation upon photoexcitation.
  • Three distinct types of anthracene excimers (face-to-face, angular, T-shaped) were identified and confirmed.
  • Control over excimer type is achievable by modulating the propensity for ground-state aggregation.
  • Increased pi conjugation resulted in intense and exclusive room-temperature excimer emission.

Conclusions:

  • Anthracene-modified PAMAM dendrimers exhibit controllable aggregation and excimer formation in mixed solvents.
  • The geometry of anthracene excimers can be tuned by altering aggregation behavior.
  • These findings open possibilities for developing novel fluorescent materials based on dendrimer architecture.