Depression of the Melting Point in Naturally Grown Circular Crystals.

ABSTRACT: The melting point is one of the most fundamental properties of crystalline materials and has been commonly used to determine the chemical and phase purity of organic compounds. Here, we report a significant depression in the melting point of about 1.4 K in naturally grown crystals with a circular shape obtained for one polymorph of the tetradecamorphic compound 5-methyl-2-((2-nitrophenyl)-amino)-3-thiophenecarbonitrile (ROY). Crystals of ROY grown by microspace sublimation have peculiar habits, with irregular, elongated, occasionally bent, or curled habits, and with one or both of their ends closed into loops. In contrast to the straight crystals, the Mueller matrix microscopic analysis suggested the continuous reorientation of electrical dipole moments in the curled crystals. When heated,

SUBMITTER: Jia S 

PROVIDER: S-EPMC12933368 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature