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3 Polish Journal of Chemistry

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Spectroscopic Characterization, Crystal and Molecular Structure of [ReBr2N(PPh3)2]

Dzięgielewski J., Michalik S., Jaworska M., Kruszyński R., Kusz J.

Polish Journal of Chemistry

2005

Vol. 79 / nr 7

1193-1203

Rhenium nitrido-complex [ReNBr2(PPh3)2] has been characterized by X-ray diffraction, IR and UV-Vis spectroscopies. The geometry optimization was carried out with the DFT method using B3LYP functional. The electronic spectrum was calculated with the TDDFT method.

Crystal Structure, EXAFS Study and Low Temperature Magnetic Properties of Ammonium Hexabromorhenate

Mroziński J., Tomkiewicz A., Hartl H., Brüdgam I., Villain F.

Polish Journal of Chemistry

2002

Vol. 76 / nr 2-3

285-293

Crystal and molecular structures of ammonium hexabromorhenate (NH4)2ReBr6 have been determined by the heavy atom method. The title compound crystallizes red-violet crystals in the space group Fm3m with Z = 4. The Re atom is of six-coordinate octahedral configuration, being bonded to six bromide anions. The magnetic behaviour of (NH4)2ReBr6 has been investigated over the temperature range 1.72-300 K. These measurements revealed that this compound is an antiferromagnet with Neél temperature TN = 15.5 K. The magnetic data are interpreted in terms of zero-field splitting of the ground 4A2g term (D = 22.8 cm-1), large because of the high spin-orbit coupling constant for the Re+4 ion, with antiferromagnetic exchange coupling (J = -17.7 cm-1).

The Synthesis, Spectroscopic Characterization, Crystal and Molecular Structure of [ReBr3(NO)(dppe)]0.60[ReBr4(dppe)]0.40

Dzięgielewski J., Machura B., Małecki J., Bartczak T., Czurak W.

Polish Journal of Chemistry

2000

Vol. 74, nr 2

191-198

[ReOBr3(dppe)] (where dppe denotes Ph2PCH2CH2PPh2) reacts with gaseous nitric oxide in the presence of an acces of free PPh3 to give [ReBr3(NO)(dppe)0.60[ReBr4(dppe)]0.40, characterized by X-ray crystallography, IR, UV-Vis, and magnetochemical measurements. The coplex is a paramagnetic compound with magnetic moment 2.54 MB.