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

• Autorzy: Mroziński J. , Tomkiewicz A. , Hartl H. , Brüdgam I. , Villain F.
• Języki publikacji: EN

Abstrakty

EN

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).

Słowa kluczowe

EN

rhenium complex; magnetism; crystal structure; FIR spectra; EXAFS

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2002
• Tom: Vol. 76 / nr 2-3
• Strony: 285--293
• Opis fizyczny: Bibliogr. 19 poz., rys.

Twórcy

autor

Mroziński J.

• Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland

autor

Tomkiewicz A.

• Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland

autor

Hartl H.

• Institute of lnorganic and Anafytical Chemistry, Freie Unńersitat Berlin, Fabeckstr. 34-36, D-14195 Berlin, Germany

autor

Brüdgam I.

• Institute of lnorganic and Anafytical Chemistry, Freie Unńersitat Berlin, Fabeckstr. 34-36, D-14195 Berlin, Germany

autor

Villain F.

• Laboratoire de Chimie Inorganique et Materiaux Moleculaires ESA 7071 CNRS, Universitó Pierre et Marie Curie, 75252 Paris Cedex 05, France

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