The pKa of Pentazole (HN5)
Sanjeev Rachuru
A , Jagannadham Vandanapu B D and Adam A. Skelton C
+ Author Affiliations
- Author Affiliations
A Department of Chemistry, Geethanjali College of Engineering and Technology, Cheeryal-501301, Telangana, India.
B Department of Chemistry, Osmania University, Hyderabad-500007, India.
C Department of Pharmacy, School of Health Science, University of KwaZulu-Natal, Durban 4000, South Africa.
D Corresponding author. Email: jagannadham1950@yahoo.com
Australian Journal of Chemistry 74(8) 584-590 https://doi.org/10.1071/CH21014
Submitted: 11 January 2021 Accepted: 4 May 2021 Published: 28 May 2021
Abstract
Pentazole having the molecular formula HN5 is an archetypical five-membered homocyclic inorganic aromatic molecule consisting of five nitrogen atoms. A hydrogen atom is bonded to one of the nitrogens. Even though the molecule does not contain a carbon it appears last in the series of the heterocyclic azole family; the family containing one to five nitrogen atoms. This series of heterocyclic azoles is pyrrole, imidazole, pyrazole, triazole, tetrazole, and the last one is the pentazole. Barring pentazole, the rest of the members of the azole family are heterocyclic organic molecules. The pKa of N(1)H-acidity values of all the azole members are known, except for that of pentazole. In the present work we endeavoured to determine the pKa of pentazole by a graphical method and by performing theoretical DFT calculations.
Keywords: pentazole, pKa, DFT.
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