Magnetic properties, crystal and molecular stucture of (NBu4)2[ReCl4(ox)]

The synthesis, structure and magnetic properties of the rhenium(IV) complex (NBu4)2[ReCl4(ox)] is reported. The crystal and molecular structure (NBu4)2[ReCl4(ox)] has been solved by the heavy atom method and refined anisotropically to R1=0.049 for 5636 unique observed reflections. The title compound crystallizes in the monoclinic space group P21/n with Z=4. The Re atom is of six-coordinate distorted octahedral configuration being bonded to one bidentate oxalate group and four chloride anions. The asymmetric unit contains one [ReCl4(ox)]- 2 anion and two [NBu4]+ cations. The magnetic behavior of (NBu4)2[ReCl4(ox)] has been investigated over the temperature range 1.72–300 K. This measurement revealed that examined compound is magnetically diluted with the great value of zero-field splitting parameter D=53 cm-1.