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Antiferromagnetism of colloidal [Mn0·0.3THF]x

✍ Scribed by Joachim Sinzig; L. Jos de Jongh; Helmut Bönnemann; Werner Brijoux; Rainer Köppler

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
143 KB
Volume
12
Category
Article
ISSN
0268-2605

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✦ Synopsis

The reduction of MnBr 2Á 2THF (THF = tetrahydrofuran) using K[BEt 3 H] yields the organosol [Mn Á 0.3THF] x . According to the UV/Vis, ESR (electron spin resonance spectroscopy), HRTEM (high-resolution transmission electron microscopy), XPS (X-ray photoelectron spectroscopy) and XAS (X-ray absorption spectroscopy) data, this nanosized metal colloid consists of small THF-stabilized Mn 0 particles which show, in susceptibility investigations, a diminished magnetic coupling as deduced from the Weiss temperature, Â = 96 K. The Nee ´l temperature T N is likewise strongly reduced in comparison with the bulk value (95 K). The THF-stabilized Mn 0 particles exhibit superparamagnetism below 20 K, with a partial blocking at 10 K, and to our knowledge represent the first colloid consisting of particles of an elemental antiferromagnetic metal.

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