3,7‐Diazadibenzophosphole Oxide: A Phosphorus‐Bridged Viologen Analogue with Significantly Lowered Reduction Threshold

Phosphorus pulls its weight: Installation of a phosphoryl group as central bridge in the 4,4′-bipyridine scaffold introduces improved reduction responses that become even more pronounced in the corresponding phosphoryl-bridged methylviologen (see picture). Importantly, the scaffold maintains the typical viologen optical response upon reversible reduction, however, at much lower potentials. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.