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Structure and magnetic properties of a new iron(II) citrate coordination polymer
Author(s) -
Birsa Čelič Tadeja,
Jagličič Zvonko,
Lazar Karoly,
Zabukovec Logar Nataša
Publication year - 2013
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
eISSN - 2052-5206
pISSN - 2052-5192
DOI - 10.1107/s2052519213023713
Subject(s) - coordination polymer , polymer , chemistry , organic chemistry
The new compound [Fe(H 2 cit)(H 2 O)] n (NICS‐2) is the first neutral ferrous citrate carboxylate that has been synthesized up to now. The iron citrate coordination polymer was hydrothermally synthesized and the structure was solved using single‐crystal X‐ray diffraction. It crystallizes in an orthorhombic space group P 2 1 2 1 2 1 (No. 19), with a = 5.9470 (4), b = 10.4021 (5), c = 13.5773 (7) Å, V = 839.91 (8) Å 3 , Z = 4. Its structure consists of one‐dimensional chains of corner‐sharing Fe II O 6 octahedra that are additionally cross‐linked with citrate ligands. Chains are additionally stabilized into a pseudo‐three‐dimensional structure by hydrogen bonds. The measurement of magnetic properties revealed that the magnetic moment is almost constant above 100 K (μ eff = 5.1 µ B ), but decreases rapidly below this temperature most probably due to the appearance of weak antiferromagnetic interactions between Fe atoms. Additionally, analysis of Mossbauer spectra confirmed the presence of divalent Fe atoms in the structure. Thermogravimetrical and X‐ray high‐temperature diffraction analyses showed the thermal stability of the material up to 548 K.