Cyclic structure of pyrrole-acetone binary clusters: Comparative study of the N-H⋯OC hydrogen bond

- We measured the NH stretches of pyrrole-acetone clusters by IR spectroscopy.
- The band at 3334 cm−1 was decomposed into two Lorentzian components.
- We assigned a component at 3334 cm−1 to the NH stretch of the 2-1 cluster.
- Vibrational analysis revealed that the 2-1 cluster shows cyclic structure.