On the Stability of Trioxo(η5 ‐Cyclopentadienyl) Compounds of Manganese, Technetium, and Rhenium : An ab initio SCF Study

An isolobal analogy exists between the radicals TcO3, ReO3, and CH3, but not between MnO3 and CH3, according to ab initio SCF calculations. Consequently, compounds containing RTcO3 and RReO3 groups (where R is an organic or inorganic residue) should be stable. These results confirm calculations based on CpMO3 (1), which predict positive force constants for M  Tc or Re, but repulsion in the case M = Mn.