The He(I) photoelectron spectrum of 4,5-bis(dimethylamino)fluorene (1) has been recorded and compared with those of 4-(dimethylamino)- and 4-aminofluorene, 3 and 4, respectively. The assignment of the PE spectra is based on ZDO calculations and on the correlation of the bands. It is shown that the split between the two lone pairs of the dimethylamino groups in 1 amounts to 2.2 eV. MINDO/3 calculations on 1, 3, and 4 reproduce the PE results of 3 and 4 reasonably well but fail to reproduce the split of the lone pairs in 1.
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Gleiter et al. (1984) studied this question.
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