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Investigation of copper chelate of beta-cyclodextrin by spectrophotometric titration with EDTA using window factor analysis

机译：EDTA分光光度法滴定滴定法研究β-环糊精铜螯合物

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摘要

Copper(II) is known to form a 2:1 complex with beta-cyclodextrin in alkaline solution (pH ≥ 12), but its formation constant has not been determined. The present investigation involved determination of the formation constant of the complex by spectrophotometric titration with ethylenediaminetetraacetic acid (EDTA) using Window Factor Analysis (WFA). WFA is a self-modeling chemometric technique that extracts the concentration profiles of individual species from evolutionary processes such as complexometric titration. Eleven aqueous solutions at fixed pH (pH ≥ 12) were prepared. Each solution contained a fixed amount of copper and cyclodextrin and different amount of EDTA. The visible absorption spectrum of each sample was recorded from 900 nm to 500 nm. The number of components responsible for the spectral data were determined by Principal Factor Analysis (PFA). The concentration profiles of the complexes formed were determined using WFA. Applying stoichiometric balance to the concentration profiles, the titration complex was determined to be (Cu2HO 2CD.EDTA)-7, and its logarithm of formation constant was calculated to be 8.51 +/- 0.21. The logarithm of dissociation constant for the dissociation of the titration complex into (Cu(OH)(EDTA))-3 was calculated to be -1.99 +/- 0.21. Using this information and considering the solubility product constant of Cu(OH)2 as well as the formation constant of (Cu(OH)(EDTA))-3, the logarithm of formation constant of (Cu2HO2CD)-3 was calculated to be 35.64 +/- 0.38.
机译：已知铜（II）在碱性溶液（pH≥12）中与β-环糊精形成2：1络合物，但尚未确定其形成常数。本研究涉及使用窗口因子分析（WFA）通过乙二胺四乙酸（EDTA）分光光度滴定法确定络合物的形成常数。 WFA是一种自建模化学计量技术，可从进化过程（例如复杂滴定法）中提取单个物种的浓度分布。制备了11种固定pH（pH≥12）的水溶液。每种溶液均包含固定量的铜和环糊精以及不同量的EDTA。记录每个样品在900nm至500nm的可见吸收光谱。通过主因子分析（PFA）确定负责光谱数据的组分数。使用WFA确定形成的复合物的浓度分布。将化学计量的平衡应用于浓度曲线，可以确定滴定络合物为（Cu2HO 2CD.EDTA）-7，其形成常数的对数计算为8.51 +/- 0.21。滴定络合物解离成（Cu（OH）（EDTA））-3的解离常数的对数计算为-1.99 +/- 0.21。使用此信息并考虑到Cu（OH）2的溶解度常数和（Cu（OH）（EDTA））-3的形成常数，计算出（Cu2HO2CD）-3的形成常数的对数为35.64 +/- 0.38。

著录项

  • 作者

    Darj, Mike.;

  • 作者单位

    Stevens Institute of Technology.;

  • 授予单位 Stevens Institute of Technology.;
  • 学科 Analytical chemistry.;Physical chemistry.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 117 p.
  • 总页数 117
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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