Abstract
A Ge-bridged methylviologen derivative (GMV2+2I−) was synthesized by dimethylation of dipyridinogermole (DPyG). Viologen GMV2+2I− showed a UV absorption band at 270 nm, similar to DPyG and longer than the corresponding bridge-free methylviologen (MV2+2I−). Electrochemical properties of GMV2+2I− were investigated with respect to cyclic voltammograms, showing highly reversible two step reduction, like MV2+2I−. Interestingly, GMV2+2I− exhibited enhanced electron-affinity with higher 1st reduction potential by approximately 0.08 V than that of MV2+2I−, likely due to the effects Ge-bridge lowering the LUMO energy level. However, the 2nd potential was little affected by the bridge. Clear electrochromic colour changes based on the reversible electrochemical interconversion among GMV2+/GMV+/GMV were observed in acetonitrile. Monomethylated DPyG (GMV′+I−) was also prepared, whose properties are discussed in comparison with those of DPyG and GMV2+2I−.
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