Department of Chemistry, Banaras Hindu University, Varanasi 221005, U.P., India.
Department of Chemistry, Banaras Hindu University, Varanasi 221005, U.P., India.
Carbohydr Polym. 2014 Sep 22;110:388-95. doi: 10.1016/j.carbpol.2014.04.035. Epub 2014 Apr 21.
Graft copolymers based on dextran (Dx) and 2-acrylamido-2-methyl-1-propane sulphonic acid (AMPS) were synthesized by free radical initiated solution polymerization technique using ceric ammonium nitrate as initiator. These graft copolymers were used to prepare Cu(II) and Ni(II) chelates by reactions with Cu(II) and Ni(II) metal ions respectively. Graft copolymer and metal chelates were characterized by elemental analysis, intrinsic viscosity, FT-IR, scanning electron microscopy (SEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA) and powder X-ray diffraction (XRD). Elemental analysis, intrinsic viscosity and FT-IR studies revealed the incorporation of metal ions to form metal chelates. SEM studies showed the change in morphology due to metal incorporation. From AFM studies it was observed that there was increase in Root mean square (RMS) roughness values in case of metal complexes. Metal chelates were observed to be thermally more stable than graft copolymer from TGA. UV-vis spectroscopy study revealed increase in absorbance values and cyclic voltammetric (CV) studies showed more than tenfold increase in redox current due to formation of Cu(II) and Ni(II) metal chelates. The binding constants of each complex determined by using UV-visible spectroscopy revealed that Cu(II) has more binding ability than Ni(II).
基于葡聚糖（Dx）和 2-丙烯酰胺-2-甲基-1-丙磺酸（AMPS）的接枝共聚物通过自由基引发的溶液聚合技术合成，使用硝酸铈铵作为引发剂。这些接枝共聚物分别与 Cu(II)和 Ni(II)金属离子反应，用于制备 Cu(II)和 Ni(II)螯合物。接枝共聚物和金属螯合物通过元素分析、特性粘度、FT-IR、扫描电子显微镜（SEM）、原子力显微镜（AFM）、热重分析（TGA）和粉末 X 射线衍射（XRD）进行表征。元素分析、特性粘度和 FT-IR 研究表明金属离子的掺入形成了金属螯合物。SEM 研究表明，由于金属的掺入，形态发生了变化。从 AFM 研究中可以观察到，金属配合物的均方根（RMS）粗糙度值增加。从 TGA 可以看出，金属螯合物比接枝共聚物在热稳定性方面更有优势。紫外可见光谱研究表明，由于 Cu(II)和 Ni(II)金属螯合物的形成，吸光度值增加，循环伏安（CV）研究表明，氧化还原电流增加了十倍以上。通过紫外可见光谱法确定的每个配合物的结合常数表明，Cu(II)的结合能力比 Ni(II)更强。
