Iron¨Cdextran complex: Geometrical structure and magneto-optical features

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• 作者：Bartł ; omiej Graczykowski ; Andrzej Dobek  ; ;   ; ^ciah@tlen.pl ;   ; ^{dobek@amu.edu.pl}
• 关键词：Iron&ndash ; dextran complex ; Cotton&ndash ; Mouton effect ; Light refractive index ; Light scattering ; Optical polarizability ; Magnetic dipole moment ; Magneto-optical polarizability
• 刊名：Journal of Colloid and Interface Science
• 出版年：2011
• 出版时间：15 November 2011
• 年：2011
• 卷：363
• 期：2
• 页码：551-556
• 全文大小：652 K

文摘

Molecular mass of the iron¨Cdextran complex (M_w = 1133 kDa), diameter of its particles (?.3 nm) and the content of iron ions in the complex core (N_Fe = 6360) were determined by static light scattering, measurements of refractive index increment and the Cotton¨CMouton effect in solution. The known number of iron ions permitted the calculation of the permanent magnetic dipole moment value to be ¦Ì_Fe = 3.17 ¡Á 10^?8 erg Oe^? and the determination of anisotropy of linear magneto-optical polarizabilities components as . Knowing both values and the value of the mean linear optical polarizability ¦Á = 7.3 ¡Á 10^?0 cm³, it was possible to show that the total measured CM effect was due to the reorientation of the permanent and the induced magnetic dipole moments of the complex. Analysis of the measured magneto-optical birefringence indicated very small optical anisotropy of linear optical polarizability components, ¦Ê_¦Á, which suggested a homogeneous structure of particles of spherical symmetry.