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CHARGE LOCALIZATION IN THE DIANION OF TETRAPHENYLGERMOLE ACCORDING TO 13C NMR DATA

The complete assignment of the resonances of the C NMR spectrum of the 2,3,4,5tetraphenylgermole dianion (lb) was carried out by 2D NMR spectroscopy. Chemical shifts of ring carbon atoms in the germole dianion in THF solution compared with those of uncharged analogs appears to be the result of the polarization which depends on the negative charge localized on the heteroatom. Introduction Dianions of 1-silaand 1 -germacyclopentadienes (siloles and germoles) have become recently a subject of intensive experimental and theoretical studies because of their potential aromatic character. Possible aromaticity of these species has been suggested based on X-ray structural data obtained for crystals of la and lb [1-5] as well as on the results of NMR studies [6-10] and ab initio calculations at different levels [11-13]. Ph