The positive solvatochromism exhibited by 2‐(dimethylamino)‐7‐nitrofluorene (DMANF) and 2‐fluoro‐7‐nitrofluorene (FNF) was used to determine the solvent dipolarity/polarizability (SPP) of 29 saturated aliphatic alcohols, four unsaturated alcohols, an aromatic alcohol, a triol, and water. The SPP values for the alcohols lie at the top of the SPP solvent polarity scale. The SPP values for n‐alkanols decreases with increasing chain length, in contrast to the behavior of n‐alkanes. On the other hand, the polarity of n‐alkanols, like that of n‐alkanes, increases on cyclization. The polarity of m‐cresol (1.0) and of 1,1,1,3,3,3‐hexafluoro‐2‐propanol (1.007) places these solvents at the top of the SPP scale.
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Catalán et al. (1995) studied this question.
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