M. Ystenes et al., VIBRATIONAL ANALYSIS OF THE P7(3-), AS7(3-), AND SB7(3-) CAGE-LIKE (C3(V)) ANIONS BASED ON SCALED QUANTUM-MECHANICAL (SQM) CALCULATIONS ON P7(3-), Journal of molecular structure. Theochem, 111, 1994, pp. 27-34
A scaled quantum mechanical (SQM) vibrational analysis at the 6-31G/S
CF level was performed for P-7(3-). The force field was transferred to
the isostructural homologues As-7(3-) and Sb-7(3-) and rescaled with
two parameters. For As-7(3-) and Sb-7(3-) the calculations confirm an
earlier assignment of the vibrational spectra, whereas for P-7(3-) som
e bands are reassigned. Transfer of a 6-31G/SCF force field from the
isostructural and isoelectronic molecule P4S3 to P-7(3-) confirms the
revised assignments. The mechanism of the valence tautomerism in P-7(3
-) is also verified.