Abstract

A pyrazine-2-carboxylate (pzCO₂) complex of copper(II) has been synthesized, studied structurally and magnetically, and compared with structurally similar compounds. The structure of [CuCl(pzCO₂)] (1) is reported and compared with the known structures of [Cu(pzCO₂)₂] (2) and [Cu(pzCO₂)₂(H₂O)₂] (3). Single-crystal X-ray diffraction measurements show that 1 crystallizes in the monoclinic space group Pc, with two crystallographically independent five-coordinate Cu(II) ions in a geometry close to square-pyramidal. It has a bilayer structure in the packing. Magnetic susceptibility data of 1 show that it exhibits weak ferromagnetic interactions (2 J = 2.26(7) K). In contrast, magnetic susceptibility data of 2 and 3 show weak antiferromagnetic interactions.

摘要

合成了铜 (II)的吡嗪-2-羧酸盐 (pzCO ₂ ) 络合物，对其进行了结构和磁性研究，并与结构相似的化合物进行了比较。报道了 [CuCl(pzCO ₂ )] ( 1 ) 的结构，并与 [Cu(pzCO ₂ ) ₂ ] ( 2 ) 和 [Cu(pzCO ₂ ) ₂ (H ₂ O) ₂ ] ( 3 ) 的已知结构进行了比较). 单晶X射线衍射测量表明1在单斜空间群P中结晶c，具有两个晶体学上独立的五坐标 Cu(II) 离子，其几何形状接近方锥体。它在填料中具有双层结构。1 的磁化率数据表明它表现出弱铁磁相互作用 (2 J = 2.26(7) K)。相反，2和3的磁化率数据显示出弱的反铁磁相互作用。