A tetrahedrally distorted mononuclear copper(II) complex, [Cu(salabza)] 1, and two dinuclear CuLn complexes, [Cu(salabza)Ln(hfac)3] (Ln = Gd 2 or Lu 3), were synthesized and their molecular structures determined, where H2salabza and Hhfac denote N,Nâ²-bis(salicylidene)-2-aminobenzylamine and 1,1,1,5,5,5-hexafluoroacetylacetone, respectively. In complex 1 the deviations of the four co-ordinating atoms (O(1), O(2), N(1) and N(2)) of salabza2â and the copper atom from the least-squares equatorial plane O(1)O(2)N(1)N(2) indicate the tetrahedral distortion around Cu. In 2 and 3 the CuII and LnIII are bridged by the two phenolic oxygens of salabza2â. The Cuâ¯Ln distances are 3.2481(8) Ã
for 2 and 3.1825(7) Ã
for 3. The structures of 2 and 3 were found to consist of a perfectly discrete dinuclear CuLn unit, the shortest intermolecular Cuâ¯Cu, Cuâ¯Ln and Lnâ¯Ln distances being 6.002(1), 7.522(1) and 8.507(1) Ã
for 2, and 5.998(1), 7.509(1) and 8.584(1) Ã
for 3, respectively. Cryomagnetic susceptibility measurements of 2 in the region of 2 K to room temperature indicated the operation of a ferromagnetic interaction between CuII and GdIII, with J = +0.8 cmâ1 based on H = â2JSCu·SGd. This was confirmed by measurements of the field dependence of magnetization at 2 K.
合成了一个四面体变形单核
铜(II)配合物[Cu(salabza)] 1和两个双核
铜镧配合物[Cu(salabza)Ln(hfac)3](Ln = Gd 2或Lu 3),并确定了它们的分子结构、其中 H2salabza 和 Hhfac 分别表示 N,Nâ²-双(亚
水杨醛)-
2-氨基苄胺和 1,1,1,5,5,5-
六氟乙酰丙酮。在复合物 1 中,Salabza2â 的四个配位原子(O(1)、O(2)、N(1)和 N(2))和
铜原子偏离最小二乘赤道面 O(1)O(2)N(1)N(2) 表明
铜周围存在四面体畸变。在 2 和 3 中,CuII 和 LnIII 被 salabza2â 的两个
酚氧原子桥接。2 的 Cuâ¯Ln 间距为 3.2481(8) Ã,3 为 3.1825(7) Ã。研究发现,2 和 3 的结构由完全离散的双核 CuLn 单元组成,2 分子间最短的 Cuâ¯Cu、Cuâ¯Ln 和 Lnâ¯Ln 距离分别为 6.002(1)、7.522(1) 和 8.507(1);3 分子间最短的 Cuâ¯Cu、Cuâ¯Ln 和 Lnâ¯Ln 距离分别为 5.998(1)、7.509(1) 和 8.584(1)。2 在 2 K 至室温区域的低温磁感应强度测量结果表明,CuII 与 GdIII 之间存在
铁磁相互作用,根据 HÂ =Â â2JSCuÂ-SGd 计算,JÂ =Â +0.8 cmâ1 。对 2 K 时磁化的磁场依赖性的测量证实了这一点。