The dimer (9,9‘-bianthryl), trimer, and tetramer of anthracene,
linked in the 9,10-position and equipped with
solubility-increasing alkyl substituents, were investigated by steady
state and time-resolved fluorescence
spectroscopy and by transient absorption. In polar solvents,
charge separation occurs with dipole moments
increasing with chain length. The ease of charge separation
depends on the energetic competition of the
charge transfer (CT) and the lowest excitonic state. It is
especially favorable for the tetramer in which the
CT state was observed even in a 77 K frozen alcoholic
matrix.
In its current version, the ECG algorithm cannot replace visual EEG arousal scoring. Sensitivity for detecting <10-s EEG arousals needs to be improved. However, in a nonclinical population, it may be valuable to supplement visual EEG arousal scoring by this automatic, objective, reproducible, cheap, and time-saving method.
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