Synthesis, crystal structure and Hirshfeld surface analysis of N-(4-methoxyphenyl)picolinamide

Abstract

The synthesis, crystal structure, and Hirshfeld surface analysis of N-(4-methoxyphenyl)picolinamide (MPPA), C13H12N2O2, are presented. MPPA crystallizes in the monoclinic space group P21/n, with a single molecule in the asymmetric unit. Structural analysis reveals that all non-hydrogen atoms are nearly coplanar, and the molecule exhibits two intramolecular hydrogen bonds that stabilize its conformation. Supramolecular features include significant intermolecular interactions, primarily C—H...π and various hydrogen bonds, contributing to the overall crystal cohesion, as confirmed by energy framework calculations yielding a total interaction energy of −138.3 kJ mol−1. Hirshfeld surface analysis indicates that H...H interactions dominate, followed by C...H and O...H interactions, highlighting the role of van der Waals forces and hydrogen bonding in crystal packing.