Alternating Ferro/Antiferromagnetic Copper(II) Chain Containing an Unprecedented Triple Formato/Hydroxido/Sulfato Bridge

作者：Gomez Garcia Carlos J^*; Escriva Emilio^*; Benmansour Samia; Borras Almenar Juan J; Folgado Jose Vicente; Ramirez de Arellano Carmen

来源：Inorganic Chemistry, 2016, 55(5): 2664-2671.

DOI：10.1021/acs.inorgchem.6b00105

The first example of a triple formato/hydroxido/sulfato (FHS) bridge for any metal is reported in compound [Cu-2(bpym)(OH)(HCO2)-(SO4)(H2O)(2)]center dot 3H(2)O (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, J(AF) = -139 cm(-1), and J(F) = 116 cm(-1) (alpha = J(F)/vertical bar J(AF)vertical bar = 0.83). The J(AF) value found corresponds very well to those previously reported for Cu-bpym-Cu bridges (average value of ca. -150 cm(-1)). The J(F) 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.

• 出版日期2016-3-7