Chemical Physics Letters, Vol.342, No.1-2, 85-90, 2001
Unconventional ring currents in an'all-metal aromatic', Al-4(2-)
The square planar anion Al-4(2-) supports an unconventional diamagnetic ring current which originates in the a system, has negligible contribution from the two-electron pi system, and survives in pyramidal bimetallic clusters MAI, (M = Li, Na, Cu).