Abstract
The properties of N,N′-bis(4-cyanophenyl)piperazine are described. This molecule has been devised to exhibit bridging properties, together with the possibility of giving twisted internal charge transfer (TICT) states following irradiation. The crystal structure shows that the molecule is almost planar in the ground state. Photochemical excitation on the charge transfer band at 300 nm gives rise to a luminescence which is very sensitive to the solvent polarity. In butanol, the dual luminescence characteristic of TICT is observed, which is attributed to the twisting motion of the acceptor(s) part of the molecule with respect to the donor. Transient absorption measurements have been also performed, which characterize the triplet state. A comparison with dimethylaminobenzonitrile is made.
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