Heterometallic clusters based on an uncommon asymmetric “V-shaped” [Fe3+(μ-OR)Ln3+(μ-OR)2Fe3+]6+ (Ln = Gd, Tb, Dy, Ho) structural core and the investigation of the slow relaxation of the magnetization behaviour of the [Fe2Dy] analogue

Savva, Maria; Alexandropoulos, Dimitris; Pissas, M.; Perlepes, Spyros P.; Papatriantafyllopoulou, Constantina; Sanakis, Yiannis; Tasiopoulos, Anastasios J.

doi:10.1039/d2dt03938a

Cited by 2 publications

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“…The δ value is consistent with a high-spin Fe III ion in an octahedral environment comprising N/O-donors. 78 A more accurate determination of Δ E Q is hindered by the broadness of the peak. The broadness of the spectrum is attributed to relaxation effects and this is often observed in isolated high-spin ferric ions in the solid state.…”

Section: Resultsmentioning

confidence: 99%

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Hexanuclear {ZnII4FeIII2} and {ZnII4CrIII2} complexes from the use of potentially tetradentate NOO′O′′ Schiff-base ligands

Pantelis,

Skiadas,

Lada

et al. 2024

New J. Chem.

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Section: Resultsmentioning

confidence: 99%

“…Again this value is consistent with a high-spin Fe III ion possessing a mixed O/N-donor coordination sphere. 78 The Δ E Q value is estimated to be ∼0.5 mm s −1 . At 80 K, the central peak becomes broader.…”

Section: Resultsmentioning

confidence: 99%

Hexanuclear {ZnII4FeIII2} and {ZnII4CrIII2} complexes from the use of potentially tetradentate NOO′O′′ Schiff-base ligands

Pantelis,

Skiadas,

Lada

et al. 2024

New J. Chem.

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Tetradentate NOO′O″ Schiff-Base Ligands as a Platform for the Synthesis of Heterometallic CdII-FeIII and CdII-CrIII Coordination Clusters

Pantelis,

Skiadas,

Lada

et al. 2024

Magnetochemistry

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The chemistry of heterometallic metal complexes continues to attract the interest of molecular inorganic chemists mainly because of the properties that different metal ions can bring to compounds. Contrary to the plethora of 3d–4f- and 3d–3d′-metal complexes, complexes containing both 3d- and 4d-metal ions are much less studied. The choice of the bridging organic ligand is of paramount importance for the synthesis of such species. In the present work, we describe the use of the potentially tetradentate NOO′O″ Schiff bases N-(2-carboxyphenyl)salicylideneimine (saphHCOOH) and N-(4-chloro-carboxyphenyl)salicylideneimine (4ClsaphHCOOH) in CdII-MIII (M = Fe, Cr) chemistry. The complexes [Cd2Fe2(saphCOO)4(NO3)2(H2O)2] (1), [Cd2Cr2(saphCOO)4(NO3)2(H2O)2] (2), [Cd2Fe2(4ClsaphCOO)4(NO3)2(H2O)2] (3) and [CdCr2(4ClsaphCOO)4(H2O)3(EtOH)] (4) have been structurally characterized, the quality of the structure of the latter being poor but, permitting the knowledge of the connectivity and the main structural features. Complexes 1–3 are isostructural, but not isomorphous, possessing a variety of lattice solvent molecules (EtOH, MeCN, CH2Cl2, H2O). The metal topology can be described as two isosceles triangles sharing a common CdII…CdII edge. The two CdII atoms are doubly bridged by two μ-aqua groups. The MIII…CdII sides of the triangles are each asymmetrically bridged by one carboxylate oxygen atom of a 2.2111 saphCOO2−/4ClsaphCOO2− ligand. The core of the molecules is {Cd2M2(μ-Oaqua)2(μ-OR)4}6+, where the OR oxygen atoms are the bridging carboxylate oxygens. The coordination spheres of the metal ions in the centrosymmetric molecules are [Cd(Oaqua)2(Ocarboxylato)4(Onitrato)2] and [M(Nimino)2(Ocarboxylato)2(Ophenolato)2]. The biaugmented trigonal prism is the most appropriate for the description of the coordination geometry of the CdII atoms in 1 and 3, while the geometry of these metal ions in 2 is best described as distorted triangular dodecahedral. A combination of H-bonding and π–π stacking interactions give interesting supramolecular patterns in the three tetranuclear compounds. The three metal ions in 4 define an isosceles triangle with two almost equal CdII…CrIII sides. The CdII center is linked to each CrIII atom through one carboxylato oxygen of a 2.2111 4ClsaphCOO2− ligand. The core of the molecule is {CdCr2(μ-OR)2}6+, where the OR oxygen atoms are the bridging carboxylato oxygens. A tridentate chelating 1.1101 4ClsaphCOO2− ligand is bonded to each CrIII. The coordination spheres are [Cd(Oaqua)3(Oethanol)(Obridging carboxylato)2(Oterminal carboxylate)2] and [Cr(Obridging carboxylato)(Oterminal carboxylato)(Ophenolato)2(Nimino)2]. Complexes 1–4 are the first heterometallic 3d–4d complexes based on saphHCOOH and 4ClsaphCOOH. The structures are critically compared with those of previous reported ZnII-MIII (M = Fe, Cr) complexes. The IR and Raman spectra of the complexes are discussed in terms of the coordination modes of the ligands involved. UV/VIS spectra in CH2Cl2 are also reported, and the bands are assigned to the corresponding transitions. The δ and ΔEQ57Fe-Mössbauer parameters of 1 and 3 at room temperature and 80 K suggest the presence of isolated high-spin FeIII centers. Variable-temperature (1.8–310 K) and variable-field (0–50 kOe) magnetic studies for 1 and 2 indicate the absence of MIII…MIII exchange interactions, in agreement with the long distances (~8 Å) between the paramagnetic metal ions. The combined work demonstrates the ability of saphCOO2− and 4ClsaphCOO2− to give 3d–4d metal complexes.

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Heterometallic clusters based on an uncommon asymmetric “V-shaped” [Fe³⁺(μ-OR)Ln³⁺(μ-OR)₂Fe³⁺]⁶⁺ (Ln = Gd, Tb, Dy, Ho) structural core and the investigation of the slow relaxation of the magnetization behaviour of the [Fe₂Dy] analogue

Abstract: The synthesis, crystal structures, Mössbauer spectra and variable temperature dc and ac magnetic susceptibility studies of a new family of trinuclear heterometallic Fe3+/Ln3+ complexes, [Fe2Ln(PhCO2)3((py)2CO2)((py)2C(OMe)O)2(NO3)Cl] (Ln = Gd (1/Gd), Tb...

Cited by 2 publications

References 115 publications

Hexanuclear {ZnII4FeIII2} and {ZnII4CrIII2} complexes from the use of potentially tetradentate NOO′O′′ Schiff-base ligands

Hexanuclear {ZnII4FeIII2} and {ZnII4CrIII2} complexes from the use of potentially tetradentate NOO′O′′ Schiff-base ligands

Tetradentate NOO′O″ Schiff-Base Ligands as a Platform for the Synthesis of Heterometallic CdII-FeIII and CdII-CrIII Coordination Clusters

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