New complexes of mercury(II) tetrafluoroborate with the dicarboxylic acid hydrazides of oxalic, malonic, succinic, adipic, phthalic and terephthalic acids have been synthesized using 1:1 and 1:2 metal to ligand reactant ratios. They have been characterized by their spectral, magnetic and conductance measurements. The molar magnetic susceptibilities indicate that they are diamagnetic with some evidence of polarization paramagnetism. The IR studies suggest bidentate coordination through any two of the carbonyl, amino and amide groups. Octahedral coordination about the metal ion has been proposed for the complexes, with the tetrafluoroborate anion in the outer sphere. Plausible structures have been suggested.
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