ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS, vol.73, pp.698-709, 2017 (ESCI)
The title compounds, [CdBr2(C12H10N4O)]center dot CH3OH, (I), and [CdI2(C12H10N4O)], (II), are cadmium bromide and cadmium iodide complexes of the ligand (E)-N'-(pyridin-2-ylmethylene)picolinohydrazide. Complex (I) crystallizes as the methanol monosolvate. In both compounds, the Cd2+ cation is ligated by one O atom and two N atoms of the tridentate ligand, and by two bromide anions forming a Br2N2O pentacoordination sphere for (I), and by two iodide anions forming an I2N2O pentacoordination sphere for (II), both with a distorted square-pyramidal geometry. In the crystal of complex (I), molecules are linked by pairs of N-H center dot center dot center dot O and O-H center dot center dot center dot Br hydrogen bonds, involving the solvent molecule, forming dimeric units, which are linked by C-H center dot center dot center dot Br hydrogen bonds forming layers parallel to (101). In the crystal of complex (II), molecules are linked by N-H center dot center dot center dot I hydrogen bonds, forming chains propagating along . 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).