Add time:07/25/2019         Source:sciencedirect.com

4,12-di-(2-ferrocenylvinyl)-[2.2]-paracyclophane 2 has been prepared and investigated with respect to its electrochemical and UV/Vis/NIR spectroelectrochemical properties. Cyclic and square wave voltammetric measurements show two consecutive one-electron oxidations with a moderate redox splitting of 112(±3) mV for the individual Fc/Fc+ couples. In spite of this redox splitting, radical cation 2•+ is a class I mixed-valent system with no detectable electronic coupling between the individual redox sites as is shown by the comparison of the Vis/NIR spectra of 2•+, 22+ and the radical cation of 4-(2-ferrocenylvinyl)-[2.2]-paracyclophane, 4•+. The NIR bands observed for the oxidized forms have been assigned as ferrocene-based d-d transitions by quantum chemical calculations.

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