Complexes of the ligand 2,3-dioxo-1,4,8,11-tetraaza-cyclotetradecane (exoO2-cyclam) have been prepared of formula [M1M2(exoO2-cyclam)}2][BPh4]2 where M1M2 = CoCo (3), ZnZn (4), MnCu (5), FeCu (6), CoCu (7), NiCu (8), ZnCu (9), and [(bipy)2RuCu(exoO2-cyclam)}][NO3]2 (10). Complex 10 crystallised in the space group C2/c and shows Jahn–Teller distorted Cu(II) with axial nitrate ligands. The Cu(exoO2-cyclam)} moiety chelates to the Ru with Ru–O distances of 2.082(5) Å. Complexes 5–10 show a Cu(II)/Cu(III) redox process and additional metal-centred (6, 8, 10) processes and ligand-centred (10) processes. The electrochemical and UV-Vis spectroelectrochemical study of 10 suggested two closely-spaced oxidations based on the Cu and Ru centres which suggests that substituted derivatives of 10 will be of interest for enhanced charge separation in dye-sensitised solar cells. Magnetic susceptibility measurements revealed dominant antiferromagnetic coupling within the trinuclear species 3, 5–8. Complex 10 showed Curie–Weiss behaviour with weak intermolecular interactions.
制备了
配体 2,3-二氧代-
1,4,8,11-四氮杂环十四烷(exoO2-cyclam)的配合物,其式为 [M1M2(exoO2-cyclam)}2][BPh4]2,其中 M1M2 = CoCo (3)、ZnZn (4)、MnCu (5)、FeCu (6)、CoCu (7)、NiCu (8)、ZnCu (9) 和 [(bipy)2RuCu(exoO2-cyclam)}][NO3]2 (10)。配合物 10 在空间群 C2/c 中结晶,显示出带有轴向
硝酸配体的 Jahn-Teller 扭曲 Cu(II)。Cu(exoO2-cyclam)}分子与 Ru 发生螯合,Ru-O 间距为 2.082(5)埃。络合物 5-10 显示了 Cu(II)/Cu(III) 氧化还原过程以及以
金属为中心的附加过程(6、8、10)和以
配体为中心的附加过程(10)。对 10 的电
化学和紫外-可见光谱电
化学研究表明,基于 Cu 和 Ru 中心的两个紧密间隔的氧化过程表明,10 的取代衍
生物将有助于增强
染料敏化太阳能电池中的电荷分离。磁感应强度测量显示,在三核物种 3、5-8 中,反
铁磁耦合占主导地位。复合物 10 表现出居里-魏斯行为,分子间相互作用微弱。