We report on seven 4-ferrocenylphenyl-substituted tritylium dyes Fc-C₆H₄-C⁺Ar₂ with either unlinked or interlinked aryl residues Ar, including congeners with six-membered (thio)xanthylium and seven-membered (dihydro)dibenzo[a,d]cycloheptatrienylium motifs. All complexes are intensely colored and show more or less intense absorption bands owing to charge transfer from the 4-ferrocenylphenyl donor to the C⁺Ar₂ acceptor unit as well as reversible electrochromism upon reduction and oxidation. The spectral profiles and redox potentials depend on whether or not the methylium center is incorporated into a 14-π-electron arene system. T-dependent EPR spectroscopy indicates that their one-electron-reduced neutral radicals dimerize. The ensuing monomer–dimer equilibria were studied by quantitative spin-counting methods, which revealed an unexpectedly large extent of 85.0–99.6% of dimerization.

中文翻译：

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具有开放和相互连接的C ⁺ Ar ₂实体的4-二茂铁基苯基取代的Tritylium染料：氧化还原行为，电致变色及其中性自由基二聚化的定量研究

我们报告了七个4-二茂铁基苯基取代的三苯ity染料Fc-C ₆ H ₄ -C ⁺ Ar ₂带有未连接或互连的芳基残基Ar，包括与六元（硫代）x鎓和七元（二氢）二苯并[ a，d ]环庚三烯基基序。由于从4-二茂铁基_苯基供体到C ⁺ Ar ₂受体单元的电荷转移以及还原和氧化时可逆的电致变色作用，所有配合物均呈强烈着色并显示或多或少的吸收带。光谱曲线和氧化还原电势取决于亚甲基中心是否结合到14-π电子芳烃系统中。Ť依赖的EPR光谱表明，它们的单电子还原中性基团二聚。随后的单体-二聚体平衡通过定量旋转计数法进行了研究，结果显示出意想不到的很大程度的二聚化85.0-99.6％。