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AgF2 as a 2D scaffold of the organic-inorganic hybrid materials with tailored magnetic properties? Probing reactivity of silver(II) fluoride towards a variety of inorganic and organic salts.

Przemyslaw Malinowski 1,  Wojciech Grochala 1,2

1. Warsaw University, Faculty of Chemistry, Pasteura 1, Warszawa 02-093, Poland
2. Interdyscyplinarne Centrum Modelowania Matematycznego i Komputerowego (ICM), Żwirki i Wigury 93, Warszawa 02-089, Poland

Abstract

High-temperature superconductivity in fluoroargentates(II) has been postulated in 2001 [1]. AgF2, a fascinating binary fluoride of Ag(II) and a powerful oxidizer, contains puckered [AgF2] sheets and it exhibits ferromagnetic ordering below 165 K. Unfortunately, ferromagnetism is usually detrimental to the appearance of superconductivity. In this account we describe attempts of the formation of the inorganic-inorganic and inorganic-organic hybrid materials with well-defined electronic two-dimensionality. We target materials with flat [AgF2] sheets, to promote antiferromagnetic ordering, which is beneficial for superconductivity.

We have studied experimentally the solid-solid reactions between AgF2 and a variety of organic (salts of perfluorinated carboxylic acids and perfluorinated alcohols) and inorganic compounds (including oxides and chlorides of selected transition metals). For many systems we observe redox reactions with the concomitant oxidation of respective anions even at quite low temperatures (100 oC). The potential of organic and inorganic compounds to form a hybrid with AgF2 is therefore limited by their redox propeties.

We do not observe the formation of hybrid materials at the conditions of experiments performed. We therefore propose an alternative wet approach based on generation of a metastable beta form of AgF2, i.e. a diamagnetic Ag(I)[Ag(III)F4], and its in-situ egzothermic transformation to AgF2 in the presence of the hybrid-forming component. Such approach could hopefully lead to novel 2D fluoroargentates with tailored magnetic properties.

[1] W. Grochala, R. Hoffmann, Angew. Chem. Int. Ed. Engl. 40 (15): 2743-2781 2001.
 

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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium D, by Przemyslaw Malinowski
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-14 13:01
Revised:   2009-06-07 00:44