Hexanuclear {Zn$^{II}_4$Fe$^{III}_2$} and {Zn$^{II}_4$Cr$^{III}_2$} complexes from the use of potentially tetradentate NOO′O′′ Schiff-base ligands - Archive ouverte HAL
Article Dans Une Revue New Journal of Chemistry Année : 2024

Hexanuclear {Zn$^{II}_4$Fe$^{III}_2$} and {Zn$^{II}_4$Cr$^{III}_2$} complexes from the use of potentially tetradentate NOO′O′′ Schiff-base ligands

Sotiris G Skiadas
Zoi G Lada
Rodolphe Clérac
Pierre Dechambenoit
  • Fonction : Auteur
  • PersonId : 1398236

Résumé

The use of N-(2-carboxyphenyl)salicylideneimine (saphHCOOH) and N-(4-chloro-carboxyphenyl)- salicylideneimine (4ClsaphHCOOH) for the synthesis of hexanuclear {ZnIIMIII} (M = Cr, Fe) complexes is described. [Zn4Fe2(saphCOO)6(NO3)2(EtOH)2] (1), [Zn4Cr2(saphCOO)6(NO3)2(H2O)2] (2) and [Zn4Fe2(4Cl-saphCOO)6(NO3)2(EtOH)2] (3), as 4CH2Cl2 2EtOH (1, 3) and 4MeCN 2EtOH (2) solvates, have been isolated and their structures have been determined by single-crystal X-ray crystallography. The three complexes are centrosymmetric and almost isostructural. The metal topology can be described as two isosceles triangles which are linked through phenolate oxygen atoms of two 3.2111 (Harris notation) saphCOO2 /4ClsaphCOO2 ligands, each of which bridges exclusively three ZnII atoms. Four 2.1111 ligands are also incorporated in the molecules, each bridging one MIII center and one ZnII ion. The former is chelated with the Ophenolate, Nimine and one Ocarboxylate being the donor atoms (thus forming two 6-membered chelating rings with a common MIII–N edge), while the latter is bound to the other carboxylate oxygen. The coordination spheres are of the types {FeO4N2}/{ZnO4N}/{ZnO5} for 1 and 3, and {CrO4N2}/{ZnO4N}/{ZnO4} for 2. Complexes 1–3 are the first heterometallic complexes (with any metals) based on saphHCOOH and 4ClsaphHCOOH, thus illustrating their ability for the preparation of mixed-metal molecular species. Interesting H-bonding patterns are present in the crystal structures. The IR and Raman spectra of the solid complexes are discussed in terms of the coordination modes of the ligands involved, while molar conductivity data and UV/VIS spectra in CH2Cl2 are also reported and interpreted. The δ and ΔE$_Q$ $^5$$^7$Fe-Mössbauer parameters of 1 and 3 at 300 and 80 K indicate isolated high-spin FeIII centers. Variable-temperature (1.8–300 K) magnetic susceptibility data for 1–3 suggest a very weak exchange interaction between the MIII ions in agreement with their long distances (~ 9 Å) in the molecules.
Fichier principal
Vignette du fichier
24, NJC 10.pdf (3.65 Mo) Télécharger le fichier
Origine Publication financée par une institution
Licence

Dates et versions

hal-04637191 , version 1 (05-07-2024)

Licence

Identifiants

Citer

Konstantinos N Pantelis, Sotiris G Skiadas, Zoi G Lada, Rodolphe Clérac, Yiannis Sanakis, et al.. Hexanuclear {Zn$^{II}_4$Fe$^{III}_2$} and {Zn$^{II}_4$Cr$^{III}_2$} complexes from the use of potentially tetradentate NOO′O′′ Schiff-base ligands. New Journal of Chemistry, 2024, 48 (25), pp.11221-11232. ⟨10.1039/d4nj02030h⟩. ⟨hal-04637191⟩

Collections

CNRS INC-CNRS
28 Consultations
8 Téléchargements

Altmetric

Partager

More