Dodecanuclear iron(III) cluster with a multidentante ligand
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BOTEZAT, Olga, VAN LEUSEN, Jan, KOGERLER, Paul, BACA, Svetlana. Dodecanuclear iron(III) cluster with a multidentante ligand. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 188.
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Materials Science and Condensed Matter Physics
Editia 7, 2014
Conferința "Materials Science and Condensed Matter Physics"
7, Chișinău, Moldova, 16-19 septembrie 2014

Dodecanuclear iron(III) cluster with a multidentante ligand


Pag. 188-188

Botezat Olga12, Van Leusen Jan2, Kogerler Paul2, Baca Svetlana1
 
1 Institute of Applied Physics, Academy of Sciences of Moldova,
2 RWTH Aachen University
 
Disponibil în IBN: 7 martie 2019


Rezumat

Design and preparation of oxo- and hydroxo-bridged polynuclear iron clusters attract a great interest during last decades due to their possibilities to exhibit interesting magnetic phenomena such as single molecule magnetism or molecular spin frustration. Such high-nuclear iron clusters can also serve as building blocks in preparation of magnetic coordination polymers [1]. The reaction of μ3-oxo trinuclear iron(III) isobutyrate [Fe3O(is)6(H2O)3]NO3 · 2(MeCN) · 3(H2O) cluster with sodium azide and two multidentate N-/O-donor ligands: H4teda (N,N,N,N-tetrakis(2- hydroxyethyl)ethylenediamine)) and H2mdea (N-methyldiethanolamine), in mixture of methanol and ethanol leads to the formation of a new dodecanuclear iron(III) cluster [Fe12O4(OH)2(teda)4(N3)4(CH3O)4](N3) · (NO3) · n(solvent) (1). A single-crystal X-ray diffraction analysis of 1 showed that twelve Fe(III) atoms are bridged by four μ4-O2 ions, two hydroxy μ2-OH groups and four teda4 ligands, whereas four N3 and four methoxy MeO groups are completed the coordination spheres of iron(III) atoms (Fig. 1). Figure 1. Structure of dodecanuclear cluster (left) and a hydrogen-bonded chain (right, N atoms of bridging azide and O atoms of OH groups emphasized as blue and red balls) in 1. Color scheme: Fe, green spheres; N, blue; O, red, C, grey sticks. Hydrogen bonds are shown as blue dotted lines. Two N-atoms of teda4 coordinate chelating to metal atom and each of O-atoms of four hydroxy groups coordinates bridging to neighboring metal atoms. The outer azide forms hydrogen N…H-O bonds of 2.7 Å with hydroxyl groups of neighboring clusters [Fe12O4(OH)2(teda)4(N3)4(CH3O)4]2+ to generate a cationic hydrogen-bonded {Fe12} cluster-based chain. Note, H2mdea ligand does not coordinate to metal ions in 1, although its presence necessary for formation of big brown crystals; without this ligand crystals do not grow. The spectroscopic, thermal and magnetic properties of 1 have also been investigated and will be discussed in connection with the structural peculiarities.