Synthesis and characterisation of a novel ferrimagnetic chain based on copper(II) and rhenium(IV)

Publication date: Available online 14 May 2019Source: Comptes Rendus ChimieAuthor(s): Carlos Rojas-Dotti, Adrián Sanchis-Perucho, Marta Orts-Arroyo, Francesc Lloret, José Martínez-LilloAbstractA novel one-dimensional copper(II)–rhenium(IV) coordination polymer of formula {[ReIVBr4(μ-ox)CuII(pyim)2]·MeCN}n (1) [ox = oxalate anion, pyim = 2-(2′-pyridyl)imidazole] has been prepared and characterised. Powder X-ray diffraction measurements on a sample of 1 support the purity of the bulk sample, whereas single-crystal X-ray diffraction shows that 1 crystallises in the orthorhombic system with space group Pbca. The crystal structure of 1 is made up of [CuII(pyim)2]2+ cations and [ReBr4(ox)]2− anions linked through bridging bromide and oxalate groups, which generate alternating CuII and ReIV chains. Variable-temperature magnetic susceptibility measurements performed on 1 reveal an antiferromagnetic coupling between the CuII and ReIV ions; at lower temperatures, this interaction leads to the occurrence of ferrimagnetic behaviour in 1. Compound 1 is the first ferrimagnetic compound obtained with the [ReBr4(ox)]2− precursor.RésuméUn nouveau polymère de coordination unidimensionnel à base de cuivre(II) et de rhénium(IV), de formule {[ReIVBr4(μ-ox)CuII(pyim)2]·MeCN}n (1) [ox = anion oxalate, pyim = 2-(2′-pyridyl)imidazole], a été préparé et caractérisé. Les mesures de diffraction des rayons X sur poudre ont confirmé la pureté de l’échantillon, alors que la...

Source: Comptes Rendus Chimie - May 15, 2019 Category: Chemistry Source Type: research