Abstract
The electrochemical behavior of a series of eight previously reported monoferrocenyl- and diferrocenyl-boronates derived from tridentate ligands has been studied. Even if most mononuclear and all the dinuclear complexes examined showed to undergo slow decomposition in nonaqueous solution (releasing free ferrocenyl boronic acid), their redox activity has been investigated. It has been proved that the oxidation of the two ferrocenyl subunits in the dimeric species proceeds simultaneously, indicating that no mutual electronic interaction exists between them. Additionally, the solid-state molecular structures of two diferrocenyl complexes ( 2a and 2b) were studied by X-ray diffraction. The analysis confirms the formation of a [5.4.0] heterobicycle with the presence of two different boron atoms, one in a tetrahedral geometry and the other one in a trigonal geometry.
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