1,3-丙二胺的不对称双Schiff碱异三核配合物的合成表征、晶体结构与磁性研究

合成了一种新的不对称双Schiff碱Cu(II)单核配合物Cu(HLt) (1) (H₃Lt为N-3-羧基水杨醛-N'-水杨醛-缩1,3-丙二胺)及其两个异三核配合物(CuLt)₂Ni]?2.5H₂O (2)和(CuLt)₂Mn]?5H₂O (3), 并用元素分析、红外光谱、电子光谱对它们进行了结构表征. 用X射线单晶衍射法测定了配合物3的晶体结构, 其晶胞中每个不对称单元包含一个异三核中性分子, 在此三核分子中, 中心Mn^2＋离子位于O₆]的变形八面体配位环境中, 两个端基Cu^2＋离子位于N₂O₂]的平面正方场中. 在5～300 K范围内测定了两个三核配合物的变温磁化率, 经拟合得化合物2的磁交换参数为－57.7 cm^－1, 化合物3的磁交换参数为－28.5 cm^－1, 表明在两个异三核配合物中, 中心M^2＋离子与外部Cu^2＋离子间存在弱的反铁磁自旋交换作用.

Synthesis, Characterization, Crystal Structure and Magnetic Properties of Dissymmetrical Double Schiff Base Heterotrinuclear Complexes with N-3-Carboxylsalicylidene-N'-salicylidene- 1,3-propylenediamine Trivalent Anions

A new dissymmetrical double Schiff base Cu(II) mononuclear complex: Cu(HLt) (1), where H₃Lt is N-3-carboxylsalicylidene-N'-salicylidene-1,3-propylenediamine) and its two heterotrinuclear complexes: (CuLt)₂Ni]?2.5H₂O (2) and (CuLt)₂Mn]?5H₂O (3) have been synthesized and characterized by means of elemental analyses, IR and electronic spectra. The crystal structure of the complex 3 was determined by X-ray analysis. Each dissymmetrical cell unit of the complex 3 contains one heterotrinuclear neutral molecule, in which the central Mn^2＋ ion is located at the site of O₆ with a distorted octahedral geometry and two terminal Cu^2＋ ions are located at the 4-coordination site of N₂O₂. The magnetic properties of the two heterotrinuclear complexes have been determined in the temperature range 5～300 K, indicating that the interaction between the central M^2＋ ion and the outer Cu^2＋ ions is antiferromagnetic. The exchange integrals are equal to －57.7 cm^－1 for 2 and －28.5 cm^－1 for 3.