European Journal of Inorganic Chemistry p. 4993 - 4999 (2011)
Update date:2022-08-11
Topics:
Naiya, Subrata
Drew, Michael G. B.
Diaz, Carmen
Ribas, Joan
Ghosh, Ashutosh
Two new FeIII complexes, [Fe2L2(μ-OMe) 2(NCS)2] (1) and [Fe2L2(μ-N 3)2(N3)2] (2), have been synthesized using a N,N,O-donor tridentate Schiff base ligand HL {2-[(2- dimethylaminoethylimino)methyl]phenol}, the condensation product of salicylaldehyde and N,N-dimethyl-1,2-diaminoethane. The complexes were characterized by X-ray structural analyses and variable-temperature magnetic susceptibility measurements. Both crystal structures are centrosymmetric dimers containing two FeIII atoms, which are bridged in compound 1 by two methoxy anions and in compound 2 by two μ-1,1-azides. The chelating tridentate Schiff base and a terminal thiocyanato (for 1) or azido (for 2) group complete the hexacoordination of the distorted octahedral environment of each iron center. The magnetic properties of compound 1 show the presence of antiferromagnetic exchange interactions mediated by double methoxy bridges (J =-29.45 cm-1). Compound 2 shows the presence of very weak ferromagnetic exchange interactions mediated by double μ-1,1-N3 bridges (J = 1.08 cm-1). A very rare μ-1,1-azido-bridged and a μ-OMe-bridged dinuclear FeIII compound with a tridentate N,N,O-donor Schiff base have been synthesized and characterized structurally. The former is only the third example of μ-1,1-azido bridges in Fe III. The variable-temperature magnetic studies show that the former is ferromagnetically and the latter antiferromagneticallycoupled.
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