Summary
Complexes of 2,6-dipicolinic acid hydrazide, DPH, with ZnII, CdII and HgII have been prepared and characterized by elemental analysis, i.r. and electronic spectra and by electrical conductance measurements. The ligand is terdentate, having coordination sites at two deprotonated amide-nitrogen and pyridine-nitrogen atoms. The ZnII and HgII complexes are pentacoordinate whereas the CdII complexes are hexacoordinate and have trigonal bipyramidal and pseudooctahedral stereochemistries, respectively. The Zn, Cd and Hg ions induce cyclization of DPH complexes upon reaction withβ-diketones. The complexes of macrocyclic ligands so formed have the same stereochemistries as those of DPH.
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Sahni, S.K. Novel five- and six-coordinate zinc (II), cadmium (II) and mercury(II) complexes of macrocyclic ligands. Transition Met Chem 4, 73–76 (1979). https://doi.org/10.1007/BF00618828
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DOI: https://doi.org/10.1007/BF00618828