Three new basalâapical, μ2-1,1-azide bridged complexes, [CuL1(N3)]2
(1), [CuL2(N3)]2
(2) and [CuL3(N3)]2
(3) with very similar tridentate Schiff base blocking ligands [L1
=
N-(3-aminopropyl)salicylaldimine, L2
= 7-amino-4-methyl-5-azahept-3-en-2-one and L3
= 8-amino-4-methyl-5-azaoct-3-en-2-one) have been synthesised and their molecular structures determined by X-ray crystallography. In complex 1, there is no inter-dimer H-bonding. However, complexes 2 and 3 form two different supramolecular structures in which the dinuclear entities are linked by strong H-bonds giving one-dimensional systems. Variable-temperature (300â2 K) magnetic susceptibility measurements and magnetization measurements at 2 K reveal that complexes 1 and 2 have antiferromagnetic coupling while 3 has ferromagnetic coupling which is also confirmed by EPR spectra at 4â300 K. Magnetostructural correlations have been made taking into consideration both the azido bridging ligands and the existence of intermolecular hydrogen bonds in complexes 2 and 3.
三个新的基底-顶端 μ2-1,1-
叠氮桥配合物,[CuL1(N3)]2
(1)、[Cu
L2(N3)]2
(2) 和 [CuL3(N3)]2
(3) 具有非常相似的三齿希夫碱阻断
配体 [L1
=
N-(3-
氨基丙基)
水杨醛亚胺,
L2
= 7-
氨基-4-
甲基-5-azahept-3-en-2-
酮和 L3
= 8-
氨基-4-
甲基-5-
氮杂辛基-3-en-2-
酮)已合成,并通过 X 射线晶体学测定其分子结构。在复合物 1 中,二聚体间不存在
氢键。然而,配合物 2 和 3 形成两种不同的超分子结构,其中双核实体通过强
氢键连接,形成一维系统。变温 (300–2 K) 磁化率测量和 2 K 磁化强度测量表明配合物 1 和 2 具有反
铁磁耦合,而 3 具有
铁磁耦合,这也被 4–300 K 的 EPR 谱证实。磁结构相关性考虑到配合物 2 和 3 中
叠氮桥
配体和分子间
氢键的存在。