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The Mixed-Valence Rhenium(IV, V) Complexes

Banaś B., Nahorska M., Tomkiewicz A., Kłak J., Cyfert M., Mroziński J.

Polish Journal of Chemistry

2006

Vol. 80, nr 10

1663-1676

Reaction of K4[Re2OCl10]with oxidizing agents in hydrochloric acid produced binuclear compounds: Cs3[Re2OCl10] 1, (Ph4As)3[Re2OCl10] 2, (ChinH)3[Re2OCl10] 3. These complexes had been characterized by kinetic and magnetic investigations. The low-temperature magnetic susceptibility measurements have revealed, that Cs3[Re2OCl10] complex is antiferromagnets, with Néel temperature at 10 K. The temperature dependence of the magnetic moment for 2 and 3 complexes indicates the existence of a magnetically isolated exchange-coupled dimer. In the electronic spectra, the intensive band at 20150 cm–1 is associatedwith the presence of the two different oxidation states. In agreementwith the evidence from the oxidation of oxochlororhenate ion and the disproportionation in solution, it is proposed that the compound should be considered as a Re(IV)–Re(V) mixed-valence system.

Synthesis, structure and magnetic susceptibility of ammonium hexaiodorhenate(IV)

Kochel A.

Materials Science Poland

2004

Vol. 22, No. 1

69--75

This work reports on the synthesis, magnetic properties and crystal structure of (NH4)2ReI6. Bright violet (NH4)2ReI6 is tetragonal, P4/mnc (No. 128), a = b = 7.7436(6), c = 11.6403(14) A, Z = 2, Dx = 4.68 g/cm3, T = 100(1) K. The structure was refined to R = 0.074 for 438 reflections observed. The anion [ReI6]2- has an octahedral environment. The temperature dependence of the magnetic susceptibility measured over the range of 4-300 K exhibits the Curie point at 20 K, indicating the presence of antiferromagnetic interaction between the rhenium centres.

(Ph4P)2[ReCl5(tcm)] - a new precursor of molecular magnets

Małecka J., Kochel A., Mroziński J.

Materials Science

2002

Vol. 20, No. 2

91-96

New complex of composition (PPh4)2[ReCl5(tcm)] have been obtained and characterized by IR, UV-Vis spectroscopies and magnetic measurements. The rhenium atom is six coordinate with five chloride atoms and one tcm group. The compound contains tcm- in menodendate function coordinated to metal via the N-atom. The temperature dependence of magnetic susceptibility measured over the range 1.73-300 K showed the presence of a very weak antiferromagnetic interaction ( zJ=-0.78 cm-1) between the rhenium atoms.