Abstract
AbstractPoly(benzyl ether) dendrimers with o‐, m‐, and p‐isomers of dialkoxybenzene at their focal points [o‐, m‐, and p‐(Gn)2Ar], having generation numbers (n) of 0–3, were synthesized. 1H NMR pulse relaxation times (T1) of the exterior MeO groups of o‐ and m‐(Gn)2Ar (n = 0–3) all remained in the range of 0.92–1.43 s. In sharp contrast, an exceptionally short T1 value (0.23 s) was observed for p‐(G3)2Ar. Although their absorption spectral profiles were slightly different from one another, an essential difference was observed for their fluorescence properties. When the generation number was increased, the fluorescence efficiency of o‐(Gn)2Ar increased, but that of p‐(Gn)2Ar decreased, whereas m‐(Gn)2Ar exhibited a relatively small change in the fluorescence efficiency. Fluorescence depolarization studies showed a highly efficient intramolecular energy migration in p‐(G3)2Ar as compared with o‐(G3)2Ar and m‐(G3)2Ar. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 3524–3530, 2003
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