title: Phthalazin-1(2H)-one-picric acid (1/1).
abstract: The geometric parameters of the title compound, C(8)H(6)N(2)O·C(6)H(3)N(3)O(7), are in the usual ranges. The three nitro groups are almost coplanar with the aromatic picrate ring [dihedral angles 10.2 (2)°, 7.62 (16) and 8.08 (17)°]. The mol-ecular conformation of the picric acid is stabilized by an intra-molecular O-H⋯O hydrogen bond. The phthalazin-1(2H)-one mol-ecules are connected via N-H⋯O hydrogen bonds, forming centrosymmetric dimers.
authors.forename: H S
authors.initials: HS
authors.lastname: Yathirajan
authors.forename: B
authors.initials: B
authors.lastname: Narayana
authors.forename: M T
authors.initials: MT
authors.lastname: Swamy
authors.forename: B K
authors.initials: BK
authors.lastname: Sarojini
authors.forename: Michael
authors.initials: M
authors.lastname: Bolte