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In the title imidazo[1,2- a ]pyridine derivatives, N - tert -butyl-2-(4-meth-oxy-phen-yl)-5-methyl-imidazo[1,2- a ]pyridin-3-amine, C 19 H 23 N 3 O, (I), and N - tert -butyl-2-[4-(di-methyl-amino)-phen-yl]imidazo[1,2- a ]pyridin-3-amine, C 19 H 24 N 4 , (II), the 4-meth-oxy-phenyl ring in (I) and the 4-(di-methyl-amino)-phenyl ring in (II) are inclined to the respective imidazole rings by 26.69 (9) and 31.35 (10)°. In the crystal of (I), mol-ecules are linked by N-H⋯N hydrogen bonds, forming chains propagating along the [001] direction. The chains are linked by C-H⋯π inter-actions, forming layers parallel to the (010) plane. In (II), the crystal packing also features N-H⋯N hydrogen bonds, which together with C-H⋯N hydrogen bonds link mol-ecules to form chains propagating along the c -axis direction. The chains are linked by C-H⋯π inter-actions to form layers parallel to the (100) plane. Inversion-related layers are linked by offset π-π inter-actions [inter-centroid distance = 3.577 (1) Å]. The inter-molecular inter-actions of both compounds were analyzed using Hirshfeld surface analysis and two-dimensional fingerprint plots.

acta crystallographica. section e, crystallographic communications

Crystal structure and Hirshfeld surface analysis of two imidazo[1,2-a]pyridine derivatives: N-tert-butyl-2-(4-methoxyphenyl)-5-methylimidazo[1,2-a]pyridin-3-amine and N-tert-butyl-2-[4-(dimethylamino)phenyl]imidazo[1,2-a]pyridin-3-amine