The crystal and molecular structure of bis(ferrocenecarboxylato)(phthalocyaninato)silicon(IV) (1) is reported. The structure is compared to the only other two fully solved Si(Pc) structures. The size of the Si atom is shown to vary with the nature of the axial ligands. The implications of this finding for the chemistry and structures of the [Si(Pc)O](n)() materials is discussed. The cyclic voltammograms of 1 manifest four couples. One of these is due to the ferrocenecarboxylato ligands; this indicates that both undergo oxidation and reduction at the same potentials. Here the first study of the electrochromic behavior of a complex that also contains a redox active ligand in addition to the electrochromic center (1) is also reported. The effect of the ligand redox properties on the electrochromic properties of the Si(Pc) center is discussed.
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