Preparation, Characterisation and Crystal and Molecular Structure of [N₂H₅Cu(HEDTA)]H₂O

Abstract

New hydrazinium copper(II) hydrogen ethylenediaminetetraacetate monohydrate, [N₂H₅Cu(HEDTA)]H₂O has been prepared and characterized by analytical, spectral and thermal techniques. The conductivity value indicates the non-electrolyte nature of the complex. Analytical and bond length measurements indicate the distorted octahedral geometry around the copper ion with EDTA acting as pentadentate ligand. The crystal structure of the complex has been determined from single crystal X-ray analysis. The complex crystallizes in orthorhombic system; space group Pccn. The unit cell parameters are a = 25.1858(14) Å, B = 7.3305(4) Å, C = 15.8291(9) Å, α = 90°, β = 90°, γ = 90°, V = 2,922.4(3) ų and Z = 8. The copper ion is six coordinated, three carboxylate oxygen atoms and two nitrogen atoms from EDTA occupy five coordination sites, while the sixth site is occupied by hydrazinium cation and a water molecule present outside coordination sphere as lattice water. The complex undergo multi-step degradation to give copper oxide as the final residue.

Graphical Abstract

New hydrazinium copper(II) hydrogen ethylenediaminetetraacetate monohydrate, [N₂H₅Cu(HEDTA)]H₂O has been prepared and characterized by analytical, spectral, thermal and X-ray single crystal structure techniques.