Synthesis, structure and magnetism of the oxalato-bridged chromium(III) complex [NBun4]4[Cr2(ox)5]·2CHCl3†

Abstract

The binuclear complex [NBuⁿ₄]₄[Cr₂(ox)₅]·2CHCl₃ has been prepared by an ion-exchange procedure employing Dowex 50WX2 cation-exchange resin in the n-butylammonium form and potassium tris(oxalato)chromate(III). The dimeric complex was characterised by a crystal structure determination: monoclinic, space group C2/c, a = 29.241(7), b = 15.192(2), c = 22.026(5) Å, β = 94.07(1)°, Z = 4. The magnetic susceptibility (300–4.2 K) indicated that the chromium(III) sites were antiferromagnetically coupled (J = –3.1 cm^–1).