Issue 37, 2009
From the journal:

Dalton Transactions

Iron(II)-octacyanoniobate(IV) ferromagnet with TC 43 K†

Dawid Pinkowicz,a   Robert Podgajny,*a   Robert Pełka,b   Wojciech Nitek,a   Maria Bałanda,b   Magdalena Makarewicz,b   Mariusz Czapla,b   Jan Żukrowski,c   Czesław Kapusta,c   Dariusz Zającbd  and  Barbara Siekluckaa  

* Corresponding authors

a Faculty of Chemistry, Jagiellonian University, Ingardena 3, Kraków, Poland
E-mail: podgajny@chemia.uj.edu.pl

b H. Niewodniczański Institute of Nuclear Physics PAN, Radzikowskiego 152, Kraków, Poland

c AGH University of Scence and Technology, Faculty of Physics and Applied Computer Science, Mickiewicza 30, Kraków, Poland

d Hasylab, DESY, Notkestrasse 85, Hamburg, Germany

Abstract

We have synthesized the octacyanoniobate-based cyano-bridged 3D ferromagnet {[FeII(H2O)2]2[NbIV(CN)8]·4H2O}n1 and characterized structurally, spectroscopically (XANES/EXAFS, IR, UV-Vis, Resonance Raman, 57Fe Mössbauer spectroscopy) and magnetically. 1 crystallizes in the tetragonal system, space group I4/m, a = 11.989(5) Å, c = 13.237(5) Å, V = 1902.6(13) Å3. 3D coordination architecture comprises two types of NbIV–C–N–FeIIHS (HS = high spin) linkages with Fe–N–C angles of 154.5° and 167.5°. The XANES/EXAFS spectra at Fe:K and Nb:K lines confirm the presence of NbIV–C–N–FeII linkages. Magnetic measurements reveal ferromagnetic ordering below Tc = 43 K with some non-collinearity of NbIV (S = 1/2) and FeII (S = 2) magnetic moments. The molecular field model simulation reproduces well the M(T) curve and Tc value with one average exchange coupling constant JFeNb = + 8.1 cm−1.

Graphical abstract: Iron(II)-octacyanoniobate(IV) ferromagnet with TC 43 K

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Article information

DOI
https://doi.org/10.1039/B908486J
Article type
Paper
Submitted
28 Apr 2009
Accepted
07 Jul 2009
First published
10 Aug 2009

Dalton Trans., 2009, 7771-7777

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Iron(II)-octacyanoniobate(IV) ferromagnet with TC 43 K

D. Pinkowicz, R. Podgajny, R. Pełka, W. Nitek, M. Bałanda, M. Makarewicz, M. Czapla, J. Żukrowski, C. Kapusta, D. Zając and B. Sieklucka, Dalton Trans., 2009, 7771 DOI: 10.1039/B908486J

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