Summary:

The work includes the synthesis and characterization of three ligands that contain three heterocyclic rings, one of these is thiadiazole while the others are two triazoles rings. The preparation of ligands is carried out through synthesis two precursors, the first is alkyl azides, which is prepare from the reaction of alkyl halides with sodium azide and the second is terminal alkyne was prepared by the addition reaction of propargylbromide with 2,5-dimercapto-thiadiazole dipotassium salt, then the collection between two precusors via click chemistry reaction obtained, the general preparation reaction equations summarized by the following scheme:

The prepared ligands were characterized by FT-IR, UV-Vis, ¹H,¹³C-NMR, Elemental micro analysis of elements C.H.N.S, spectroscopies in addition the solubility in different solvents was tested.

The ligand complexes were prepared by reaction of the titled ligands with Co²⁺, Ni²⁺, Cu²⁺, Pd²⁺ and Pt⁴⁺ ions, the complexes were characterized by FT-IR, UV-Vis, magnetic susceptibility and Molar conductivity measurements. The solubility of prepared complexes were tested with different solvents.

From the spectroscopies, magnetic moments and molar conductivity the suggested geometry around the metal ions can be described as:

Tetrahedral of cobalt(II) complexes with all ligands, square planar of palladium(II) complexes with all ligands, while the octahedral geometry for nickel(II), copper(II) and platinum(IV) complexes.