A new polymorph of ammonium succinate – serendipity in action

Succinic acid has been known since 1546 and was first chemically identified in the mid-19th century. In an attempt to prepare a molecular salt of succinic acid with (S)-(−)-α-methylbenzylamine, we have obtained the second polymorph of the monoammonium salt of succinic acid, NH4 +·C4H5O4 −. The crystal structure determination proves the structure of the ionic compound and the intimate role of the ammonium ion in the structure, which is compared to the earlier described polymorph.

Isoniazid cocrystallisation with dicarboxylic acids: vapochemical, mechanochemical and thermal methods

A systematic study on mechanochemical, thermal and vapochemical cocrystallisation demonstrates the effect of compound properties on the outcome of the reaction.

Solvent control in the formation of supramolecular host–guest complexes of isoniazid with p-sulfonatocalix[4]arene

The position of the anti-tuberculosis drug isoniazid inside (endo) or outside (exo) to the macrocyclic cavity of p-sulfonatocalix[4]arene can be regulated by the appropriate choice of the solvent system.