title: 2-(2-Hydroxy-ethyl)phthalazin-1(2H)-one.
abstract: In the mol-ecule of the title compound, C(10)H(10)N(2)O(2), the rings are nearly coplanar, making a dihedral angle of 2.35 (5)°. In the crystal structure, inter-molecular C-H⋯O, C-H⋯N and O-H⋯O hydrogen bonds link the mol-ecules, generating R(4) (4)(22) and R(4) (4)(24) ring motifs to form a three-dimensional network. A weak π-π inter-action between the pyridazinone and benzene rings further stabilizes the crystal structure, with a centroid-centroid distance of 3.709 (3) Å and an inter-planar separation of 3.312 Å.
authors.forename: Orhan
authors.initials: O
authors.lastname: Büyükgüngör
authors.forename: Mustafa
authors.initials: M
authors.lastname: Odabaşoğlu