Spectroscopic study of the effect of a new metal chelate on the stability of PVC

Abstract

This work deals with the preparation of a new tetradentate ligand [ H 2 L] of the N 2 O 2 type, N{2[3(1-carboxyiminoethyl)-1-phenyl]butilydene-2-amino propionic acid}, and its metal complexes with Cr(III), Fe(III), Cu(II) and Zn(II) and fully characterized by H 1 NMR, C 13 NMR, FT-IR, UV-Vis, CHN elemental analysis, magnetic moment and molar conductance in DMF solutions. Based on the experimental results obtained, octahedral geometries of Cr(III) and Fe(III) have been suggested, while Cu(II) and Zn(II) had square planar and tetrahedral symmetries, respectively. The effect of this new metal complex on the photo degradation of poly(vinyl chloride) PVC films blended with a concentration range of 2-2.5% by weight of this new complex was investigated. The changes in the average molecular weight of PVC with irradiation time were tracked to determine the order of activities of each metal complex toward the photodegradation of PVC, andthe photodegradation of PVC films was determined by measuring carbonyl, hydroxyl and polyene indices. The results showed that Cr(III) and Fe(III) complexes increase the rate of CC cleavage and behave as UV photo degradation substances, while the Zn(II) complex behaves as a UV stabilizer.

Ultra-violet spectra studies of photodegradation of PVC films in presence of Fe(III) chelate complex

“…The photodegration always possess high Kd values, which mean that these modified polymers degradated towards UV light. On the other side, there is another method for characterization degradation reaction; it is the measurement of the quantum yield of the chain scission (Φcs) [33]. The quantum yield for chain scission was calculated for PVC films of modified polymers by using this relation:…”

Efficient removal of Cu(ii) from aqueous systems using enhanced quantum yield nitrogen-doped carbon nanodots

“…It is believed that O atoms can donate a lone pair of electrons to the Cu 2+ , forming a coordinate covalent bond between Cu 2+ and O owing to the high oxidability of copper. [64][65][66][67] Considering the above results, the proposed Cu(II) adsorption by N-CDs was illustrated in Fig. 6d, in which a N-CDs-Cu 2+ complex was formed due to the electrostatic interaction between Cu(II) and the -COO À , -OH and -N functional sites on the surface of N-CDs.…”

Synthesis, characterization, density functional theory, X‐ray study, thermal stability, and biological and MOE relevance of metal complexes of griseofulvin

“…The GFV ligand showed two sharp bands at 291 and 236 nm, which may be assigned to the n–π* and π–π* transitions, respectively. The complexes showed two sharp bands in the ranges 290–292 and 233–237 nm which were assigned to n–π* and π–π* intra‐ligand transitions, respectively . In the spectra of the complexes, the n–π* transitions due to the O atom of two methoxy groups and one oxygen atom of furan ring of the ligand were shifted to higher wavelengths.…”