Theoretical study on structures and aromaticities of P(sub 5)- anion, [Ti (mu(super 5)-P5)]- and sandwich complex [Ti(mu(super 5)-P5)(sub 2)](super 2-)

The equilibrium geometries, energies, harmonic vibrational frequencies, and nucleus independent chemical shifts (NICSs) of the ground state of P(sub 5)- anion, [Ti (mu(super 5)-P5)]- and sandwich complex [Ti(mu(super 5)-P5)(sub 2)](super 2-) are calculated. The results revealed that in each of the three molecules, the P-P and Ti-P bond distances are perfectly equal.