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Sandwich Complexes Based on the “All‐Metal” Al 4 2− Aromatic Ring
Author(s) -
Mercero Jose M.,
Formoso Elena,
Matxain Jon M.,
Eriksson Leif A.,
Ugalde Jesus M.
Publication year - 2006
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200600106
Subject(s) - aromaticity , ring (chemistry) , alkali metal , crystallography , metal , transition metal , chemistry , square (algebra) , materials science , molecule , organic chemistry , catalysis , geometry , mathematics
We report on novel sandwichlike structures [Al 4 MAl 4 ] q − ( q =0–2 and M=Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W) based on the recently synthesized all–metal aromatic Al 4 2− square ring. The sandwichlike structures have two aromatic tetraaluminum square rings which trap a transition‐metal cation from either the first, second, or third row. The stability of the anionic sandwichlike complexes towards electron detachment is discussed, and addition of alkali cations is found to stabilize the 2− charged complexes, preventing spontaneous electron detachment. Once the sandwichlike complexes are formed, the Al 4 2− square properties remain nearly unchanged; this fact strongly supports the hypothesis that in these complexes the Al 4 2− square rings remain aromatic.