Binding of hydroxychromones with Al3+ in methanol

被引：17

作者：

Binbuga, Nursen

Henry, William P.

Schultz, Tor P.

机构：

[1] Mississippi State Univ, Dept Chem, Mississippi State, MS 39762 USA

[2] Mississippi State Univ, Dept Forest Prod, FWRC, Mississippi State, MS 39762 USA

来源：

POLYHEDRON | 2007年 / 26卷 / 01期

关键词：

hydroxychromones; Al3+; chelation; UV-Vis spectroscopy;

D O I：

10.1016/j.poly.2006.07.032

中图分类号：

O61 [无机化学];

学科分类号：

070301 [无机化学]; 081704 [应用化学];

摘要：

The chelation of 3-hydroxy-, 5-hydroxy- and 5,7-dihydroxychromone with Al3+ was studied spectrophotometrically. Both the molar ratio method and method of continuous variation (Job's method) were used to determine the composition of the complexes. In all cases, complex formation involved 1: 1 aluminum ion to hydroxychromone ratios. For the 5-hydroxy and 5,7-dihydroxy derivatives, this composition agrees with that for the corresponding hydroxyflavone. However, 3-hydroxyflavone (flavonol) forms a 2:1 complex with Al3+ in methanol in contrast to the results for 3-hydroxychromone in this study. The importance of the cinnamoyl mesomeric form for stabilizing the complex between flavonol and Al3+ is invoked to explain this discrepancy. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：6 / 10

页数：5

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