All-metal antiaromatic molecule: rectangular Al4(4-) in the Li3Al4(-) anion.
We report the experimental and theoretical characterization of antiaromaticity in an all-metal system, Li3Al4(-), which we produced by laser vaporization and studied with the use of photoelectron spectroscopy and ab initio calculations. The most stable structure of Li3Al4(-) found theoretically contained a rectangular Al4(4-) tetraanion stabilized by the three Li+ ions in a capped octahedral arrangement. Molecular orbital analyses reveal that the rectangular Al4(4-) tetraanion has four pi electrons, consistent with the 4n Hückel rule for antiaromaticity.
Kuznetsov
Aleksey E
AE
Department of Chemistry and Biochemistry, Utah State University, Logan, UT 84322, USA.
Birch
K Alexander
KA
Boldyrev
Alexander I
AI
Li
Xi
X
Zhai
Hua-Jin
HJ
Wang
Lai-Sheng
LS