Abstract
The title compounds, [CdBr2(C12H10N4O)]·CH3OH, (I), and [CdI2(C12H10N4O)], (II), are cadmium bromide and cadmium iodide complexes of the ligand (E)-N'-(pyridin-2-yl-methyl-ene)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 penta-coordination sphere for (I), and by two iodide anions forming an I2N2O 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).
Highlights
Chemical contextThe cadmium(II) ion, has a d10 electronic configuration and exhibits a variety of coordination geometries and modes
Kristoffersen,c Zeliha Atioğlu,d Mehmet Akkurte* and Carl Henrik Görbitzc a Edited by H
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)
Summary
The cadmium(II) ion, has a d10 electronic configuration and exhibits a variety of coordination geometries and modes. Hydrazone ligands are one of the most important classes of flexible and versatile polydentate ligands and show very high efficiency in chelating transition metal ions (Afkhami et al., 2017a). Hydrazone ligands obtained from 2-pyridine carboxylic acid can act as ditopic ligands via two different donor sites (a tridentate coordination pocket and through an Ndonor pyridine group), and have the potential to form monoand multinuclear structures (Afkhami et al, 2017b). We report on the crystal structures of two new CdII complexes based on the tridentate hydrazone ligand, (E)-N0 -(pyridin-2ylmethylene)picolinohydrazide, obtained by condensation of an equimolar mixture of 2-pyridinecarbaldehyde and picolinic acid hydrazide in methanol
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