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The hydrogen bond basicity scale pKHB(logarithm of the formation constant of 4-fluorophenol–base complexes in CCl4) has been measured for nitro-compounds. This thermodynamic basicity scale is correlated to a spectroscopic basicity scale. The Yukawa–Tsuno equation is obeyed in the nitroaromatics. We have shown that nitroenamines are the most basic nitro-compounds presently known and have hydrogen bond basicity comparable to tributylamine.
Laurence et al. (Sat,) studied this question.