Functional metal complexes based on bridging “imino”-quinonoid ligands

Exploiting exciton coupling of ligand radical intervalence charge transfer transitions to tune NIR absorption

“… 8 Interestingly, mixed valence species can exhibit low energy intervalence charge transfer (IVCT) bands in the NIR, providing an additional class of low energy absorbing materials. 9 …”

A series of tetraazalene radical-bridged M2(M = CrIII, MnII, FeII, CoII) complexes with strong magnetic exchange coupling

“…Considering the goal of installing strong magnetic exchange between a metal ion and a paramagnetic ligand, quinonoid-type ligands offer an ideal platform for the construction of molecule-based magnets, 11 as these molecules readily accommodate redox chemistry to stabilize both diamagnetic and paramagnetic redox isomers (see Scheme 1 ). Indeed, a number of dinuclear complexes bridged by tetraoxolene radicals have been shown to exhibit strong metal–ligand interactions.…”

Redox-induced umpolung of transition metal carbenes

“…In addition, the combination between palladium, which can undergo two-electron processes (oxidative addition/reductive elimination), and a redox active ligand, which can undergo sequential one electron processes, has only recently been investigated. 10 No examples in which a carbene carbon is the site of redox activity are known.…”