title: Alternating Ferro/Antiferromagnetic Copper(II) Chain Containing an Unprecedented Triple Formato/Hydroxido/Sulfato Bridge.
abstract: The first example of a triple formato/hydroxido/sulfato (FHS) bridge for any metal is reported in compound [Cu2(bpym)(OH)(HCO2)(SO4)(H2O)2]·3H2O (1). Its structure shows the presence of alternating triple FHS bridges and 2,2'-bipyrimidine (bpym) ones. Although in the initial synthesis the sulfate anions were introduced accidentally, here we report the rational synthesis and the magnetic properties of this compound. The magnetic properties show that 1 is an alternating ferro/antiferromagnetic (F/AF) chain compound with predominant antiferromagnetic interactions and were fit to an alternating F/AF S = (1)/2 chain with g = 2.103, JAF = -139 cm(-1), and JF = 116 cm(-1) (α = JF/|JAF| = 0.83). The JAF value found corresponds very well to those previously reported for Cu-bpym-Cu bridges (average value of ca. -150 cm(-1)). The JF value is also very close to the estimated one (ca. 100 cm(-1)) from magneto-structural correlations in triply Cu-Cu bridged compounds with both hydroxido and carboxylato bridges in equatorial positions.
authors.affiliation: Instituto de Ciencia Molecular (ICMol) , Universidad de Valencia , C/Catedrático José Beltrán, 2, 46980 Paterna (Valencia), Spain.
authors.forename: Carlos J
authors.initials: CJ
authors.lastname: Gómez-García
authors.affiliation: Departament de Química Inorgànica, Universitat de València , c/Vicent Andrés Estellés, s/n, 46100 Burjassot (València), Spain.
authors.forename: Emilio
authors.initials: E
authors.lastname: Escrivà
authors.affiliation: Instituto de Ciencia Molecular (ICMol) , Universidad de Valencia , C/Catedrático José Beltrán, 2, 46980 Paterna (Valencia), Spain.
authors.forename: Samia
authors.initials: S
authors.lastname: Benmansour
authors.affiliation: Departament de Química Inorgànica, Universitat de València , c/Vicent Andrés Estellés, s/n, 46100 Burjassot (València), Spain.
authors.forename: Juan J
authors.initials: JJ
authors.lastname: Borràs-Almenar
authors.affiliation: Institut de Ciència dels Materials de la Universitat de València, (ICMUV) , c/Catedrático José Beltrán, 2, 46980 Paterna (València), Spain.
authors.forename: José-Vicente
authors.initials: JV
authors.lastname: Folgado
authors.affiliation: Departament de Química Orgànica, Universitat de València , c/Vicent Andrés Estellés, s/n, 46100 Burjassot (València), Spain.
authors.forename: Carmen
authors.initials: C
authors.lastname: Ramírez de Arellano