Mössbauer, Electronic, and Structural Properties of Bis(pyridine)dithiocyanatoiron(II). a Ferromagnetically Ordered Polymer
An interesting example of an extended (lattice) ferromagnet containing three-atom covalent bridging has been characterized. The bis(pyridine)dithiocyanatoiron(II) complex, Fe(py)2(NCS)2, has been prepared by thermolysis of the tetrakis complex, Fe(py)4(NCS)2. A study of the X-ray, magnetic, and infrared, electronic, and Mössbauer spectral properties of the bis complex has indicated that it contains polymeric, pseudooctahedral, coordination geometry with near linear bridging thiocyanate ligands. The electronic spectrum of the bis complex shows a larger, low symmetry, ligand field than that present in Fe(py)4(NCS)2. Unperturbed Mössbauer spectra reveal a larger quadrupole splitting and a smaller isomer shift in the bis complex as compared with the tetrakis complex. The magnetically perturbed Mössbauer spectrum at room temperature shows that the principal component of the electric field gradient tensor is positive and corresponds to a dxy ground orbital. Mössbauer spectra at 4.2°K in zero and longitudinal magnetic fields of up to 80 kG confirm the presence of ferromagnetic ordering. The latter spectra, which have been computer simulated, indicate an internal hyperfine field, H, of 280 kG, a positive axially symmetric electric field gradient, Vzz, and an angle, ß, of 75° between Vzz and H.
W. M. Reiff et al., "Mössbauer, Electronic, and Structural Properties of Bis(pyridine)dithiocyanatoiron(II). a Ferromagnetically Ordered Polymer," Inorganic Chemistry, vol. 13, no. 9, pp. 2153-2158, American Chemical Society (ACS), Sep 1974.
The definitive version is available at http://dx.doi.org/10.1021/ic50139a020
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