Three crystalline forms of 1,3,5-benzene-tri(3-pyridinyl)carboxamide from the same solvent system

The crystallization of the title compound from the MeOH resulted in three crystalline forms depending on the concentration of the solution, one of which contains N–H⋯N hydrogen bonds between pyridine and amide moieties, while the second one is constituted by amide-to-amide N–H⋯O hydrogen bonds and the third one crystallizes in a different crystalline phase (threads) and the phase could not be identified. These three phases have shown different behaviours in TGA and DSC studies.