Isophthalic acid–3,6-bis(2-pyrazinyl)-1,4-dihydro-1,2,4,5-tetrazine (1/1)

Abstract

The cocrystallization of isophthalic acid (H2ip) with 3,6-bis­(2-pyrazin­yl)-1,4-dihydro-1,2,4,5-tetra­zine (H2bpztz) yields the title binary mol­ecular cocrystal, C8H6O4·C10H8N8 or [(H2ip)·(H2bpztz)]. In the isophthalic acid molecule, a crystallographic twofold rotation axis passes between the carboxyl substituents. In the tricyclic molecule, a crystallographic twofold rotation axis is perpendicular to the central ring. Inter­molecular O—H⋯N and C—H⋯O inter­actions between the carboxyl and pyrazinyl groups of the two components produces a one-dimensional zigzag tape. Further N—H⋯N hydrogen bonds between adjacent H2bpztz mol­ecules generate a three-dimensional supra­molecular network. The resulting diamond networks are of fivefold parallel inter­penetration and are consolidated by π–π stacking inter­actions (3.70 Å) between the aromatic rings.