Abstract
Dendrimers are highly branched macromolecular systems whose structure can be defined on a molecular level. Recent investigations of different generations of rigid dendrimers containing a terrylenediimide chromophore in the center and peryleneimide chromophores at the rim gave evidence for a directional energy transfer between a peryleneimide donor and the terrylenediimide acceptor chromophore within these dendrimers. By means of polychromatic transient absorption measurements and by comparing transient absorption spectra of these dendrimers to different model compounds, this process is further investigated in detail. Two different generations of dendrimers are investigated along with a set of three different model compounds, which only contain one of the donor-acceptor pair chromophores. For excitation, 250 fs laser pulses at 495 nm generated in an OPA pumped by a regeneratively amplified fs laser system are used. The multi-colour transient absorption changes are probed using a fs white light continuum and a CCD camera detection system. In order to account for possible multi-photonic processes, a series of excitation energy dependent measurements are performed.
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