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Preferred Label : relative hardness;

IUPAC definition : The difference between the values of the absolute hardnesses (η) of a given molecule and the corresponding reference structure (η a): η r η- η a. The values of relative hardnesses correlate well with the resonance energies of cyclic compounds and may be used as an index of aromaticity.;

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The difference between the values of the absolute hardnesses (η) of a given molecule and the corresponding reference structure (η a): η r η- η a. The values of relative hardnesses correlate well with the resonance energies of cyclic compounds and may be used as an index of aromaticity.

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29/07/2025


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