Comment on ‘Thermodynamic relations and ro-vibrational energy levels of the improved Pöschl-Teller oscillator for diatomic molecules’

We argue that the canonical partition function derived by Eyube et al (2021 J. Phys. B 5 155102) is not correct because the authors did not take into account the contribution of the rotational degrees of freedom. Consequently, the thermodynamic functions derived from it are unsuitable for any physical application.