AM1-type semiempirical molecular orbital calculations at the level of RHF a
pproach have bean performed on certain [2(2)](1,4)-cyclophane-fused tetraaz
aporphyrins having Be+2, Si+2, Si+4, Ge+2, Ge+4 and Zn+2 as the central ion
s. The geometries, stabilities and the frontier molecular orbital energies
were discussed. (C) 2000 Elsevier Science B.V. All rights reserved.