The construction of 32 scaffolds at the periphery of a fifth generation poly(propyleneimine) dendrimer, in which glycinylurea‐modified molecules can be selectively bound, represents a novel approach to functionalize dendrimers (see schematic representation). These supramolecular architectures have enhanced rigidity and show reversibility of the modification.

We have studied the mobility of charge carriers along self-organizing pi-stacks of hydrogen-bonded phenylene vinylene oligomers in solution, by time-resolved microwave conductivity measurements. The value deduced for the mobility along the stacks is 3 x 10(-3) and 9 x 10(-3) cm2/(V s) for holes and electrons, respectively. Additionally, we have calculated the mobility along the pi-stacks using a hopping model based on parameters from density functional theory. The mobility values obtained from these calculations are in good agreement with the experimental values if it is assumed that there are relatively large twist angles between neighboring molecules in the stack. It is shown that a significantly higher mobility can be attained if the twist angle between neighboring oligomers is reduced.

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undecithiophenes, the longest characterized oligothiophenesHoeve, ten, W.; Wynberg, H.; Havinga, E.E.; Meijer, E.W.