Homo- and heteronuclear iron complexes {Fe2MO} with salicylic acid: Synthesis, structures, and physicochemical properties

Gorinchoy, Viorina; Zubareva, V. E.; Shova, Sergiu; Szafranski, V. N.; Lipkowski, Janusz; Stănică, Nicolae; Simonov, Yu. A.; Turta, Constantin

doi:10.1134/s1070328409100042

Cited by 9 publications

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References 18 publications

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“…The hexa-iron complexes C1 and C2 were observed to contain only high-spin iron, S = 5/2, according to the values modeled for chemical isomer shift (δ) and electric quadrupole splitting (Δ E Q ). 2 , 50 , 51 The room-temperature Mössbauer spectrum of C1 ( Figure 5 ) revealed a pair of quadrupole doublets, of approximately equal area, both with an isomer shift of 0.40 mm/s but with quadrupole splittings of 1.18 and 0.57 mm/s. This is attributed to the asymmetry that occurs within this complex at room temperature (and at the crystallographic data collection temperature) and is masked by the crystallographic disorder discussed above.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Symmetrically versus Unsymmetrically Proton-Bridged Hexa-Iron Clusters

et al. 2021

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Syntheses and magnetic and structural characterization of hexa-iron complexes of derivatized salicylaldoximes are discussed. Complexation of Fe(BF 4 ) 2 ·6H 2 O with each ligand (H 2 L1 and H 4 L2 ) in a methanolic-pyridine solution resulted in hexa-iron compounds ( C1 and C2 , respectively), which each contain two near-parallel metal triangles of [Fe 3 –μ 3 -O], linked by six fluoride bridges and stabilized by a hydrogen-bonded proton between the μ 3 -O groups. Within each metal triangle of C2 , Fe(III) ions are connected via the amine “straps” of (H 4 L2 -2H). Variable-temperature magnetic susceptibility and Mössbauer data of C1 and C2 indicate the presence of dominant antiferromagnetic interactions between the high-spin ( S = 5/2) Fe(III) centers. For C1 , two quadrupole doublets are observed at room temperature and 5 K, consistent with structural data from which discrete but disordered [Fe 3 –μ 3 -O] and [Fe 3 –μ 3 -OH] species were inferred. For C2 , a single sharp quadrupole doublet with splitting intermediate between those determined for C1 was observed, consistent with the symmetric [Fe 3 –μ 3 -O···H···μ 3 -O–Fe 3 ] species inferred crystallographically from the very short μ 3 -O···μ 3 -O separation. The differences in the physical properties of the complexes, as seen in the Mössbauer, X-ray, and magnetic data, are attributed to the conformational flexibility imparted by the nature of the linkages between the closely related ligands.

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Section: Resultsmentioning

confidence: 99%