Analysis of the structure of the cation in 3 A reveals barely significant elongation of the Al−Al bonds compared to Schnöckel's [(AlCp*) 4 ] tetrahedron ( d (Al−Al) avg. =2.769) [21] with values ranging from 2.769(2) Å to 2.816(2) Å ( d (Al−Al) avg. =2.798 Å).
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Low-Valent M<sub>x</sub> Al<sub>3</sub> Cluster Salts with Tetrahedral [SiAl<sub>3</sub> ]<sup>+</sup> and Trigonal-Bipyramidal [M<sub>2</sub> Al<sub>3</sub> ]<sup>2+</sup> Cores (M=Si/Ge).
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