Figure 1. pKa versus number of nitrogen atoms of azines

From

pKaH of the Two Conjugate Acids (CH2N5+) and (HN6+) of Two Hypothetical Molecules the Pentazine (CHN5) and the Hexazine (N6) of Azabenzene Series: A Chemical Education Perspective

R. Sanjeev, R. Ravi, D. A. Padmavathi, V. Jagannadham

World Journal of Chemical Education. 2022, 10(3), 105-109 doi:10.12691/wjce-10-3-3