Ammonia as a carrier gas for acidic-basic chromatography

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V G Berezkin1, V R Alishoev, A A Korolev

  • 1A.M Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow. berezkin@ips.ac.ru

Journal of Chromatography. A
|January 12, 2001
PubMed

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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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Amines can behave as Brønsted–Lowry bases by accepting a proton from the acid to form corresponding conjugate acids. Due to a lone pair of nonbonding electrons, aliphatic amines can also act as Lewis bases by forming a covalent bond with an electrophile.
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