Abstract
The chlorochromates(II)[NMeH3]2[CrCl4], [NEtH3]2[CrCl4], [H2en][CrCl4], [H3dien][CrCl4]Cl, and [H4trien][CrCl4]Cl2(en, dien, and trien are ethylenediamine, 3-azapentane-1,5-diamine, and 3,6-diazaoctane-l,8-diamine respectively) are ferromagnetic whereas [NMe2H2]2[CrCl4] and [NMe2H2][CrCl3] are antiferromagnetic. The ferromagnetic complexes are isomorphous with the corresponding copper(II) complexes. These are known to contain two-dimensional networks of planar [CuCl4]2– units bridged by chloride ions of adjacent units so that the metal ions occupy tetragonally elongated octahedra. The magnetic behaviour of the ferromagnetic chromium(II) complexes from room to liquid-nitrogen temperature is reasonably represented by the high-temperature series-expansion formula for a sheet ferromagnet. The reflectance spectra of all the complexes are characteristic of six-co-ordinate CrII, and, in the case of the ferromagnetic complexes, contain very sharp bands at ca. 15 800 and 18 700 cm–1 assigned to spin-forbidden bands intensified by magnetic coupling. Absorption bands in the far-i.r. spectra near 300 cm–1 are assigned to Cr–Cl stretching vibrations within the planar [CrCl4]2– units.
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