Abstract
The basic structural unit of the 1:1 co-crystal of 2-amino-5-nitro-1,3-thiazole with 4-aminobenzoic acid, [(2-antz)(4-aba)], comprises two constituent molecules associated by a hydrogen-bonded R2 2(8) graph set dimer through the carboxylic group across the N/N site of the thiazole [O–H···N, 2.614(3) Å; N–H···O, 2.991(3) Å]. Additional hydrogen-bonding associations from the three remaining amino hydrogen atoms construct a non-centrosymmetric packing lattice (space group: P21). The bulk ungraded powder exhibits a second harmonic signal of I/Iurea= 5.7. Manuscript received: 16 July 2001. Final version: 9 November 2001.
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