Crystal structures of di-bromido-{-[(pyridin-2-yl-κ)methyl-idene]picolinohydrazide-κ',}cadmium methanol monosolvate and di-iodido{-[(pyridin-2-yl-κ)methyl-idene]picolinohydrazide-κ',}cadmium.

The title compounds, [CdBr(CHNO)]·CHOH, (I), and [CdI(CHNO)], (II), are cadmium bromide and cadmium iodide complexes of the ligand ()-'-(pyridin-2-yl-methyl-ene)picolinohydrazide. Complex (I) crystallizes as the methanol monosolvate. In both compounds, the Cd cation is ligated by one O atom and two N atoms of the tridentate ligand, and by two bromide anions forming a BrNO penta-coordination sphere for (I), and by two iodide anions forming an INO penta-coordination sphere for (II), both with a distorted square-pyramidal geometry. In the crystal of complex (I), mol-ecules are linked by pairs of N-H⋯O and O-H⋯Br hydrogen bonds, involving the solvent mol-ecule, forming dimeric units, which are linked by C-H⋯Br hydrogen bonds forming layers parallel to (101). In the crystal of complex (II), mol-ecules are linked by N-H⋯I hydrogen bonds, forming chains propagating along [010]. In complex (II), measured at room temperature, the two iodide anions are each disordered over two sites; the refined occupancy ratio is 0.75 (2):0.25 (2).