A magnetic study of an Fe-chitosan complex and its relevance to other biomolecules.
A magnetic study of an Fe-chitosan complex and its relevance to other biomolecules.
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DOI：
10.1021/bm0002959
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发表时间：
2000-07
影响因子：
6.2
通讯作者：
Subhash C. Bhatia;Natarajan Ravi
中科院分区：
文献类型：
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作者：
Subhash C. Bhatia;Natarajan Ravi
用穆斯堡尔谱研究了铁-壳聚糖络合物的结构和磁性。从不同温度下测量的穆斯堡尔谱推算出的异构体位移表明，该络合物中的金属离子处于高自旋Fe(III)状态，并与至少5个N和/或O配体配位。4.2K穆斯堡尔谱是磁性的，内部磁场为441千克，大大小于高自旋Fe(III)的理想值，表明该金属与其周围的配体之间存在很强的共价性。实验数据还表明，该体系在100K左右发生相变，表现为四重双穆斯堡尔谱。对异构体位移的温度依赖性的分析表明，原子之间的谐和耦合是一个合理的近似值。通过对实验数据的分析，提出了铁-壳聚糖络合物的制备方案。
Structural and magnetic properties of an Fe-chitosan complex is investigated by Mössbauer spectroscopy. From the isomer shift deduced from the Mössbauer spectra measured at various temperatures, it is concluded that the metal ion in the complex is in the high-spin Fe(III) state and is coordinated to at least five N and/or O ligands. The 4.2 K Mössbauer spectrum is magnetic with an internal magnetic field of 441 kG, considerably smaller than the ideal theoretical value for a high-spin Fe(III), suggesting a strong covalency between the metal and its surrounding ligands. The experimental data also indicate that the system undergoes a phase transition at around 100 K as evidenced by the appearance of a quadruple doublet Mössbauer spectrum. An analysis of the temperature dependence of the isomer shift indicates the harmonic coupling between the atoms to a reasonable approximation. From the analysis of the experimental data, a scheme for the Fe-chitosan complex has been proposed.