F number is a number used in the chemistry of polycyclic aromatic hydrocarbons (PAHs) as a descriptor of their molecular size. It was proposed by R.J. Hurtubise et al in 1977.
Calculation
From a PAH it can be calculated using the formula: F = B2 + C12 - R / 2,
Example
For fluorene, the F number is: F = 6 + 1 - 0.5 = 6.5.
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