Metal Complexes of Phosphorus Compounds Including Indigoid Structure: Synthesis, Characterization, and Biological Study

Abstract

Interaction of hexachlorocyclodiphosph(V)azanes, (I a−h ) with 5,5 indigodisulfonic acid disodium salt (II) furnished the expected cyclodiphosph(V)azanes of the type (H 2 L 1 -H 2 L 8 ). The coordinating behavior of H 2 L 1 , where H 2 L 1 is 1M = Mn(II) and Co(II) (x = 2, n = 6, z = 1); M = Ni(II) (x = 2, n = 6, z = 1.5); M = Cu(II) (x = 2, n = 2, z = nil); M = Fe(III) (x = 4, n = 4, z = 4) and (L 1 ) = the deprotonated form of cyclodiphosphazane ligand. The molar conductance data show that all complexes are non-electrolytes. The spectral data and magnetic susceptibility measurements revealed that the ligand behaves as a dibasic tetradentate ligand coordinated to the metal ions through heterocyclic nitrogen and carbonyl oxygen atoms in an octahedral and square planar manner. Some ligand field parameters (Dq, B, and β), in addition to ligand field stabilization energy (LFSE), were calculated. The thermal behavior of these complexes is studied using TG technique and the different dynamic parameters are calculated applying Coats-Redfern equation. Antimicrobial activities have been studied using the agar-disc diffusion technique, and the higher antimicrobial activity has been observed for the iron (III) complex compared to the other metal complexes.

Metal Complexes of Indigo and of Some Related Ligands

“…It was proposed that in these complexes the metal ions are N,O ‐indigo coordinated. The magnetic moments and the antimicrobial activity of the metal compounds were studied . Furthermore, metal compounds with the dianion of indigocarmine and with Cr III , Cu II , Ag I , Zn II , and Cd II were reported …”

Cu (II), Zn (II), and Ce (III) metal complexes as antimicrobial pigments for surface coating and flexographic ink

“…[ 52 ] The negative Δ S * values for the decomposition steps indicate that all studied complexes are more ordered than the reactant. [ 53 ] The positive values of Δ H * mean that the decomposition processes are endothermic. [ 54 ] …”

Biogenic silver-doped mesoporous silica nanoparticles for multifunctional eco-designed textile printing

“…This enhancement in the activity implies that this linking manner could aid in the ability of silver ions to pass through the cell membrane. This association may also enhance the lipophilic nature of the silver atom, thus favoring the infiltration of the cell membrane by the lipid coating, resulting in the impairment of normal cell processes [75,76]. Furthermore, the bactericidal efficacy was more noticeable for the G+ compared to the G-.…”