Molar electric conductance of nicotinic and isonicotinic hydrazide metal complexes in correlation with their stoichiometry and substitution

ABSTRACT

New nicotinic and isonicotinic hydrazides as well as their corresponding metal chelates in the solid state have been prepared and identified. Solution molar electrical conductance was followed as a function of composition, substitution in organic ligands and metal ion variations. Results obtained lead to a better understanding about the mechanism of interaction of the present organic ligand molecules with the different metal ions in which the ligand exhibits the keto form. Based on the metal/ligand ratio, three types of complexes are evaluated. The variation of ligand field strength highly affects the final solution molar electrical conductance. At infinity, the latter has a useful application as a sensitive tool to test for decimal variations in ionic radii of the investigated transition metal ions