6533b838fe1ef96bd12a44ad

RESEARCH PRODUCT

Hexabromorhenate(IV) salt of a trans-dioxorhenium(V) cation: X-ray structure and magnetic properties

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Abstract A novel rhenium(IV)–rhenium(V) compound of formula NBu4[ReVO2(py)4][ReIVBr6] (1) (NBu4+ = tetra-n-butylammonium cation and py = pyridine) has been prepared and characterized. The crystal structure of 1 was determined by single crystal X-ray diffraction. 1 crystallizes in the monoclinic system with space group Cc. The rhenium(IV) ion is six-coordinate by six Br atoms [average value of the ReIV–Br bonds lengths being ca. 2.509(1) A], while rhenium(V) ion is six-coordinate by two axial oxo groups and four N atoms from four pyridine ligands [average values of the ReV O and ReV–N bonds lengths being ca. 1.77 and ca. 2.14 A, respectively]. The magnetic properties were investigated from susceptibility measurements performed on a polycrystalline sample of 1. Its magnetic behavior is that of a magnetically diluted Re(IV) complex and is interpreted in terms of magnetically isolated spin quartets with a high value of the zero-field splitting (|2D| is ca. 8.6 cm−1).