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

Dawid Pinkowicz | Zendy; Robert Podgajny | Zendy; Robert Pełka | Zendy; Wojciech Nitek | Zendy; M. Bałanda | Zendy; M. Makarewicz | Zendy; M. Czapla | Zendy; J. Żukrowski | Zendy; Cz. Kapusta | Zendy; D. Zając | Zendy; Barbara Sieklucka | Zendy

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

Author(s) -

Dawid Pinkowicz,

Robert Podgajny,

Robert Pełka,

Wojciech Nitek,

M. Bałanda,

M. Makarewicz,

M. Czapla,

J. Żukrowski,

Cz. Kapusta,

D. Zając,

Barbara Sieklucka

Publication year - 2009

Publication title -

dalton transactions

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.98

H-Index - 184

eISSN - 1477-9234

pISSN - 1477-9226

DOI - 10.1039/b908486j

Subject(s) - xanes , extended x ray absorption fine structure , ferromagnetism , tetragonal crystal system , crystallography , chemistry , mössbauer spectroscopy , raman spectroscopy , antiferromagnetism , spectral line , absorption spectroscopy , condensed matter physics , crystal structure , physics , quantum mechanics , astronomy , optics

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

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