Synthesis, characterization, ion‐exchange, and antimicrobial study of poly[(2‐hydroxy‐4‐methoxybenzophenone) propylene] resin and its polychelates with lanthanides (III)

Abstract

The polymeric ligand (resin) was prepared from 2-hydroxy-4-methoxybenzophenone with 1,3-propane diol in the presence of polyphosphoric acid as a catalyst on constant heating at 1608C for 13 h. The poly[(2-hydroxy-4-methoxybenzophenone) propylene] (HMBP-PD) form 1 : 2 metal/ligand polychelates (metal-polymer complexes) with La(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(III), and Dy(III). The polymeric ligand and its polychelates (metal-polymer complexes) were characterized on the basis of elemental analyses, electronic spectra, magnetic susceptibilities, IR-spectroscopy, NMR, and thermogravimetric analyses. The molecular weight was determined using number average molecular weight (M n ) by a vapor pressure osmometry (VPO) method. Activation energy (E) of the resin was calculated from differential scanning calorimetry (DSC). All the polychelates are paramagnetic in nature except La(III). Ion-exchange studies at different electrolyte concentrations, pH, and rate have been carried out for lanthanides(III) metal ions.

In Vitro Bacterial Screening and Degradation Kinetics of a Terpolymer Ligand and Its Transition Metal Complexes

“…This effect increases the lipophilic character of the metal ion, which favors the permeation through the lipoid layers of the bacterial membranes. 45 The factors such as solubility, conductivity, dipole moment, and cell permeability may also contribute to the increased activity of the complexes. The results were found to be very close to the standard (amoxicillin).…”

Synthesis, characterization and applications of coordination polymers of Ln(III)

“…3) 2 ] is acceptable. [11] In this geometry equilibrium is established between the metal ion, two ligand molecules and two water molecules, where the minimum steric hindrance results. Owing to steric hindrance, the coordination tendency of ligand always decreases with decreasing ionic radius along the series.…”

“…[11] The polymeric ligand 2-hydroxy-4-ethoxybenzophenone-1,4 butylene (HEBP-1,4-BD; 2.96 g, 0.01 mol) was dissolved in DMSO (50 ml). The lanthanum acetate (1.72 g, 0.005 mol) was dissolved in DMSO (25 ml …”

Synthesis, Thermal and Electrical Properties of 2, 2’-HBBF Copolymer Resin

“…Copolymer resin (2, 2'-HBBF-I) was prepared by condensing 2, 2'-dihydroxybiphenyl (1.86 g, 0.1 mole), biuret (1.3 g, 0.1 mole) and formaldehyde (7.5 mL of 37%, 0.2 mole) in the presence of 2 M HCl (200 mL) as a catalyst at 118 +2 0 C in an oil bath for 6 h [13][14][15][16][17] . The solid product obtained was immediately removed from the flask as soon as the reaction period was over.…”