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In 1-(2-iodo-benzo-yl)-4-(pyrimidin-2-yl)piperazine, C 15 H 15 IN 4 O, the central piperazine ring adopts an almost perfect chair conformation with the pyrimidine substituent in an equatorial site. The planar amide unit makes a dihedral angle of 80.44 (7)° with the phenyl ring. A combination of C-H⋯O and C-H⋯π(arene) hydrogen bonds links the mol-ecules into a complex three-dimensional network structure, augmented by a π-π stacking inter-action and an I⋯N halogen bond, all involving different pairs of inversion-related mol-ecules. Comparisons are made with the structures of a number of related compounds.

acta crystallographica. section e, crystallographic communications

The crystal structure of 1-(2-iodobenzoyl)-4-(pyrimidin-2-yl)piperazine: a three-dimensional hydrogen-bonded framework, augmented by π–π stacking interactions and I...N halogen bonds