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[en] Highlights: • X-ray patterns of liquid pentylammonum nitrate in 0–25 Å−1 Q-range are reported for the first time. • Experimental data are successfully reproduced with AIMD trajectories. • An extended hydrogen bond network accounts for the liquid cohesion. • The H-bond interaction is responsible for the degeneracy loss and the large splitting of the normal mode. In this article we report the study of liquid pentylammonium nitrate with Wide Angle X-ray scattering and AIMD simulations. Static and dynamical features were characterized by comparing the experimental X-ray pattern with ab initio molecular dynamics simulation trajectories. From the analysis, we were able to focus our attention on the nature and time duration of the hydrogen bond network established between cation and anion. Such H-bond interactions occur around 2.8 Å, last about 1.55 ps and lead to the loss of degeneracy of the asymmetric stretching normal mode of the anion, with a splitting of about 84 cm−1.