Table 1.

A₂ symmetry harmonic frequencies of fluorene (H₄C₆CH₂C₆H₄) estimated from a PM3 semiempirical force field

ω23 = 125 cm−1	ω28 = 792 cm−1
ω24 = 259 cm−1	ω28 = 863 cm−1
ω25 = 416 cm−1	ω30 = 896 cm−1
ω26 = 509 cm−1	ω31 = 961 cm−1
ω27 = 747 cm−1	ω32 = 1,003 cm−1

All other frequencies and symmetry assignments were taken from ref. 22.