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Polymorphs of 2,4,6‐tris(4‐pyridyl)‐1,3,5‐triazine and their mechanical properties
Author(s) -
Yuan Liangqian,
Xing Mengyao,
Pan Fangfang
Publication year - 2019
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s2052520619012514
Subject(s) - intermolecular force , crystallography , 1,3,5 triazine , crystallization , tris , chemistry , triazine , materials science , molecule , polymer chemistry , organic chemistry , biochemistry
The second polymorph of the compound 2,4,6‐tris(4‐pyridyl)‐1,3,5‐triazine (TPT) is reported, TPT‐II, which crystallizes in space group I 2/ a . Its higher density and more efficient space filling indicate the lower entropy of TPT‐II, while its slightly lower melting point indicates its weaker intermolecular interactions. The conditions of the crystallization experiments for TPT‐I and TPT‐II are the dominant factors that determine the final crystalline products. The crystals of TPT‐II are long needles. They exhibit bending behaviour along the crystallographic b direction when a mechanical force is imposed perpendicular to it, and regain their original shape after the external stress is removed. The elasticity of the single crystals is interpreted in terms of intermolecular interactions and an energy framework analysis.