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Complex formation in the Fe(II)-Fe(III)-acrylamide–water system and chemical models
Journal of Coordination Chemistry ( IF 2.2 ) Pub Date : 2020-05-18
M. Rakhimova, E. Faizulloev, A. Mametova, N. Askalieva, H. Gafforova, A. Dzhumanazarova, G. Zhakypova, Z. Abdullaeva

This paper investigates complex formation in the Fe(II)-Fe(III)-acrylamide-water system. Dependences of oxidative potentials on the concentration and model parameters of iron acrylamide complexes are discussed. Effect of reaction pH on polymerization of acrylamide and applications of polyacrylamide crosslinking reactions are described. At low pH and high temperatures, formation of water-insoluble cross-linked polymers is possible due to creation of imide bridges between the macromolecules (–CO–NH–CO–). Calculations of the formation constants according to their chemical and physical properties such as pH, temperature and ionic strength of the solution are outlined. Chemical models of acrylamide coordination compounds with Fe(III) and Fe(II) at 298.16 K and energy J = 0.5 are shown in this article. A chemical model of the equilibria numerical values of the complexes for oxidized and reduced forms of the metal, the number of protons they contain, the number of coordinated ligands, hydroxyl groups (g, p, s, l and k), are calculated by comparing the slopes of the experimental curves and partial derivative oxidative potentials of concentration variables. Dependences of the Fe(II) and Fe(III) complexes formation on pH for the systems of Fe(II)-Fe(III)-acrylamide-H2O have been determined.



中文翻译:

Fe(II)-Fe(III)-丙烯酰胺-水系统中的络合物形成和化学模型

本文研究了Fe(II)-Fe(III)-丙烯酰胺-水系统中的络合物形成。讨论了氧化电位对丙烯酰胺铁络合物的浓度和模型参数的依赖性。描述了反应pH对丙烯酰胺聚合和聚丙烯酰胺交联反应的应用的影响。在低pH和高温下,由于在大分子(–CO–NH–CO–)之间形成了酰亚胺桥,因此可能形成水不溶性交联聚合物。概述了根据其化学和物理性质(例如溶液的pH值,温度和离子强度)计算形成常数的方法。本文显示了在298.16 K和能量J = 0.5时具有Fe(III)和Fe(II)的丙烯酰胺配位化合物的化学模型。化学模型的金属的氧化和还原形式的配合物的平衡数值的化学模型,它们包含的质子数,配位体的数目,羟基(g,p,s,l和k)的计算公式如下:比较实验曲线的斜率和浓度变量的偏导数氧化电位。Fe(II)-Fe(III)-丙烯酰胺-H体系的Fe(II)和Fe(III)配合物形成对pH的依赖性2 ö已被确定。

更新日期:2020-05-18
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