Novel Schiff base transition metal complexes for imparting UV protecting and antibacterial cellulose fabric: Experimental and computational investigations

Abstract

In the search for ultraviolet radiation exposure protective textile to minimize risk factors for skin cancer, we synthesized a Schiff base ligand from the condensation reaction 2,4‐dihyroxybenzaldehyde with p‐amino aniline. Also, the Schiff base complexes with Fe (III), Mn (II), and Cr (III) were synthesized. The ligand and the complexes were characterized by ultraviolet (UV)‐visible, Fourier transform infrared spectroscopy, 1H 13C NMR, X‐ray diffraction, and elemental analysis. We treated cotton fabric (CF) with the complexes to achieve the conventional fabric materials with highly efficient and durable UV protection properties. The modified CF is also characterized via different techniques. UV protection properties of coated fabrics are investigated by measuring UV protection factor values. Excellent UV protection even after 10 washing cycles can be used in protective textiles. In contrast to fungal activity, modified CF demonstrated strong antibacterial activity. We used the density functional theory to compute the reactivity indices and the binding energy of the complexes with the cellulosic fiber. The theoretical results favor binding the Fe (III) complex with the cellulose fiber. Also, Fe (III) metal complexes gave the highest antibacterial and UV protection. The modified fabrics' antibacterial and excellent UV protection make the studied complexes potential candidates for applying UV protective (ultraviolet protection factor) textiles.

Coordinated metal complexes with curcumin Schiff base: Synthesis, investigation, antibacterial screening, antioxidant studies, molecular docking and density function theory calculations

“…It showed that Cr(III), Mn(II), and Fe(III) complexes had higher inhibition zone diameters than Saeed's complexes. These results encouraged us that our synthesized complexes gave good activities and hence the possibilities of further studies as antimicrobial drugs 52 …”

Preparation, characterization, and computational study on transition metal complexes derived from thiophene Schiff base and evaluation of their cytotoxicity against hepatic cell line, antioxidant activities, and ligand's anticorrosive properties

“…The electronic spectrum of the Schiff base established a strong band at 370 nm, which can be related to n‐π* transition of the azomethine group. This band shifted in all complexes to lower wavenumber indicating its participation in coordination 44 …”

Novel Pyrimidinethione Hydrazide Divalent and Trivalent Metal Complexes for Improved High-Performance Antimicrobial and Durable UV Blocking Cellulosic Fabric

“…Compared with antibacterial activity, modified fabrics have no activity against fungal strains, except Co-PTH-C, Ni-PTH-C, and Cd-PTH-C, which showed antifungal activities Figures 8 and 9. The outstanding antimicrobial activity of the metal-PTH-C over those of the ligand can be explained by the overtone concept and chelation theory [35]. Due to the overlap of the ligand orbital and the partial sharing of the positive charge of the metal ion with the donor groups, chelation will result in a greater reduction in the polarity of the metal ion [36].…”