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.

The present investigation reports the synthesis of mixedligand complexes of the type MAL, where M ¼ Ni(II), Zn(II), Cd(II) A ¼ 2,2 0 -bipyridylamine and H 2 L 1 ¼ catechol, H 2 L 2 ¼ pyrogallol, H 2 L 3 ¼ 2,3-dihydroxynaphthalene, H 2 L 4 ¼ protocatechuic acid. Their structures have been elucidated on the basis of elemental analyses, conductivity, thermogravimetric, magnetic moments and IR spectroscopy. The results are in accord with an octahedral environment around the central metal ions except for Ni(II). All chelates are diamagnetic. A study of the thermal properties has also been carried out.

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The resin (polymeric ligand) was prepared from 2-hydroxy-4-methoxy benzophenone with 1,4-butane diol in the presence of polyphosphoric acid as a catalyst at 160 C for 9 h. The poly[(2-hydroxy-4-methoxy benzophenone) butylene] L ¼ H(HMBP-BD) form 1:2, ML 2 , complexes with M ¼ La(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(III), and Dy(III). The polymeric ligand and its polychelates were characterized by elemental analyses, electronic spectra, and magnetic susceptibilities, IR-spectroscopy, NMR, and thermogravimetric analyses. The number average molecular weight (Mn) of the resin was determined by Vapour Pressure Osmometry (VPO). All the polychelates are paramagnetic in nature. The resins and their polychelates were screened for their antimicrobial activity against E. coli, B. substilis, S. aureus (bacteria), and S. cerevisiae (yeast). It was found that the polychelates show good antimicrobial activity compared to the free polymeric ligand.