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.

BACKGROUND: In this era, polymer‐supported catalysts are gaining more attention, as they are effective in reduction of pollution, production cost and give good yield. Due to the versatility of lanthanide catalysts in organic synthesis, we envisioned that lanthanides(III) supported polymers would afford a novel type of solid phase Lewis acids.RESULTS: The polymer–metal complexes are found to be efficient and effective catalysts in the Biginelli three‐component, one‐pot synthesis of 3,4‐dihydropyrimidin‐2(1H)‐ones. The synthesized polymer is thermally more stable and porous in nature than polychelates.CONCLUSION: The polymer–metal complexes can be used as economical and eco‐friendly catalysts for synthesis of substituted 3,4‐dihydropyrimidin‐2(1H)‐ones with different aromatic aldehydes and β‐ketoesters. Thermal stability of the polymer is higher than that of polychelates due to the presence of intramolecular hydrogen bonding. Copyright © 2009 Society of Chemical Industry

ABSTRACT:Malaria epidemic is one of the complex spatial problems around the world. According to WHO, an estimated 6, 27, 000 deaths occurred due to malaria in 2012. In many developing nations with diverse ecological regions, it is still a large cause of human mortality. Owing to the incompleteness of epidemiological data and their spatial origin, the quantification of disease incidence burdening basic public health planning is a major constrain especially in developing countries. The present study focuses on the integrated Geospatial and Multi-Criteria Evaluation (AHP) technique to determine malaria risk zones. The study is conducted in Vadodara district, including 12 Taluka among which 4 Taluka are predominantly tribal. The influence of climatic and physical environmental factors viz., rainfall, hydro geomorphology; drainage, elevation, and land cover are used to score their share in the evaluation of malariogenic condition. This was synthesized on the basis of preference over each factor and the total weights of each data and data layer were computed and visualized. The district was divided into three viz., high, moderate and low risk zones .It was observed that a geographical area of 1885.2sq.km comprising 30.3% fall in high risk zone. The risk zones identified on the basis of these parameters and assigned weights shows a close resemblance with ground condition. As the API distribution for 2011overlaid corresponds to the risk zones identified. The study demonstrates the significance and prospect of integrating Geospatial tools and Analytical Hierarchy Process for malaria risk zones and dynamics of malaria transmission.

No abstract