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Supramolecular synthon polymorphism in 2 : 1 co-crystal of 4-hydroxybenzoic acid and 2,3,5,6-tetramethylpyrazine.

Chemical communications (Cambridge, England) (2007-09-12)
B R Sreekanth, Peddy Vishweshwar, K Vyas
ABSTRACT

Co-crystals of 4-hydroxybenzoic acid and 2,3,5,6-tetramethylpyrazine (2 : 1) exhibit the first supramolecular synthon polymorphism in a co-crystal; metastable anti-hierarchic polymorph I converts to stable hierarchic form II.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
2,3,5,6-Tetramethylpyrazine, 98%