The solution phase behaviour of non-peripherally substituted octa-hexyl cadmium phthalocyanine 3 and peripherally substituted octa-2-ethylhexyl cadmium phthalocyanine 4 has been investigated in fresh solutions of CH2Cl2, CHCl3-d1 and THF/THF-d8 using 1H NMR spectrometry, UV-Vis spectroscopy, cyclic voltammetry, square wave voltammetry and linear sweep voltammetry. The compounds show an unexpected propensity to form dimeric species in CH2Cl2 and CHCl3-d1, and, in the case of 4, also to a lesser extent in THF/THF-d8. This phenomenon is not observed for their metal-free analogues 1 or 2. The electrochemical results provide particularly strong evidence for the dimeric structures. In particular both the first one-electron oxidation and one-electron reduction waves for 3 and 4, unlike those of 1 and 2, are split. This is consistent with sequential oxidation/reduction of the two Pc ligands within a dimer. The dimeric species are likely to be the immediate precursors of the recently discovered bis-cadmium tris-phthalocyanine triple-decker sandwich complexes 5 and 6 formed from 3 and 4 over a period of time. The electrochemical data for compounds 1–4 also show that (i) relative to the metal-free phthalocyanines, the cadmium phthalocyanines exhibit smaller formal reduction potentials for all but one of the observed electron transfer processes and (ii) the electron transfer processes associated with the peripherally substituted compounds, 2 and 4, are observed at more positive potentials than those for the corresponding non-peripherally substituted analogues 1 and 3.
                                    使用 1H NMR 光谱法、紫外可见光谱法、循环伏安法、方波伏安法和线性扫描伏安法,研究了非外围取代的八己基
镉酞菁 3 和外围取代的八-2-乙基己基
镉酞菁 4 在新鲜的 
CH2Cl2、
CHCl3-d1 和 THF/THF-d8 溶液中的溶相行为。这些化合物在        和      -d1 中显示出意想不到的形成二聚物的倾向,对于 4,在 THF/THF-d8 中也有较小程度的形成二聚物的倾向。而在它们的无
金属类似物 1 或 2 中却观察不到这种现象。电
化学结果为二聚体结构提供了特别有力的证据。与 1 和 2 不同的是,3 和 4 的第一个一电子氧化波和一个电子还原波都是分裂的。这与二聚体中两个 Pc 
配体的顺序氧化/还原是一致的。这些二聚物可能是最近发现的双
镉三
酞菁三层夹层复合物 5 和 6 的直接前体,它们是由 3 和 4 经过一段时间形成的。化合物 1-4 的电
化学数据还表明:(i) 相对于无
金属
酞菁,
镉酞菁在所有观察到的电子转移过程中,除一个过程外,都表现出较小的形式还原电位;(ii) 与外围取代的化合物 2 和 4 相关的电子转移过程的正电位高于相应的非外围取代类似物 1 和 3 的正电位。