Chromium(II) chemistry. Part IX. Ferromagnetic and antiferro-magnetic chlorochromates(II)
- 1 January 1975
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 18,p. 1879-1884
- https://doi.org/10.1039/dt9750001879
Abstract
The new chromium(II) complex chlorides M2[CrCl4(OH2)2][M = NH4, Hpy (pyridiniurm). Rb,orCs] are magnetically dilute, high-spin compounds with reflectance spectra of the type expected for tetragonally distorted octahedral anions [CrCl4(OH2)2]2–. Several compounds are isomorphous with their copper(II) analogues of known structure. Thermal dehydration gives compounds M2[CrCl4](M = NH4, Rb, or Cs), which are ferromagnetic as is K2[CrCl4] obtained from a hydrate too unstable to be completely characterized. The reflectance spectra again indicate tetragonal six-co-ordination, and hence the anhydrous compounds have polymeric structures which permit the ferromagnetic interaction through 180° coupling. Unusually intense spin-forbidden absorptions are found in the reflectance spectra of these compounds. The complex Cs[CrCl3(OH2)2] is weakly antiferromagnetic and presumably has a similar structure to Li[CuCl3(OH2)2]. Chloride-bridged structures in [Hpy]2[CrCl4] and M[CrCl3](M = Hpy, Me4N, or Cs) produce antiferromagnetic behaviour which leads to slight intensification of the spin-forbidden bands.Keywords
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