Photodegradation study of PVC by new metal complexes of thiourea derivatives

Abstract EN

Two series of coordination complexes of Sn(II), Co(II), Ni(II) and Cu(II) metal with N-isobutyl-N /-2, 4- dichlorobenzoyl theorem (IBT) and N-propyl-N /-2, 4- dichlorobenzoyl theorem (PBT) as a ligands were prepared and characterized.

These complexes were obtained in high yield from ethologic solution of both ligand and salt.

The formed complexes results from the salt-ligand interaction with participation of both salt action and anion.

Information on the coordination chemistry of these complexes was derived from IR, UV-Visible spectra, elemental analysis and Conductivity study.

On coordination electronic structures of these ligands change as whole, affecting practically all their vibrational pattern, however, within that complex pattern some vibrations provide valuable information on the nature of the studied complexes.

These theorem derivatives behave as neutral ligands, which coordinate the metal ion through the sulfur and oxygen atoms.

Furthermore; we used the molar ratio method to find the ratio of coordination between the metal ions and ligands by using THF as a solvent, as it shows the ratio 2 ligands to 1 metal for all prepared complexes.

The Photo stabilization activity of these complexes on Poly (vinyl chloride) film was investigated.

Where the photo stabilization activity of these compounds were determined by monitoring the carbonyl and polygene indices with irradiation time.

The change in viscosity average molecular weight of PVC were also followed with irradiation time (using THF solvent) According to the experimental results obtained we suggest some mechanisms depending on the structure of the additives.

UV absorption, peroxide decomposer and radical scavenger for photo stabilizer additives were suggested.