A Bibenzimidazole-Containing Ruthenium(II) Complex Acting as a Cation-Driven Molecular Switch

Functional Dimming of Pincer‐Shaped Bibenzimidazole‐Ruthenium(II) Complexes with Improved Anion‐Sensitive Luminescence

“…On the basis of previous reports, we concluded that the loss of emission indicates subsequent deprotonation of the amine functions, as deprotonated bibenzimidazole ruthenium complexes are generally nonluminescent. [16,18,20,24,28,33] As the mono-deprotonated and fully deprotonated bibenzimidazole ruthenium complexes are usually well-distinguishable even with the naked eye through a transition from bright red to brown to deep violet, the UV/Vis spectra of K0, K1, and K2 were recorded in acetonitrile upon the addition of either TBAF (for K0, cf. Figure 5, right) or TBAOH (for K0, Figure 6).…”

Ruthenium Imidazophenanthrolinium Complexes with Prolonged Excited‐State Lifetimes

“…[11][12][13][14] Owing to their remarkably stable photoredox chemistry, many ruthenium polypyridyl complexes are potent chromophores for lightdriven catalysis, [15,16] dye-sensitized solar cells, [17][18][19] and photocatalytic water splitting. [20,21] Crucial factors for their application herein are (1) high chemical stability, (2) intense absorption of visible light, (3) efficient population of a reactive charge-transfer (CT) excited state, and (4) long excitedstate lifetimes (up to the μs range).…”

Protonation‐Dependent Luminescence of an Iridium(III) Bibenzimidazole Chromophore

“…In their fully deprotonated state, these complexes act as metalloligands, that is, the deprotonated biimidazole sphere can bind a second metal center such as zinc(II), nickel(II), or copper(I). [1,2,8,9] The binding of these metal centers results in significant changes to their photophysical properties. This feature, which can be observed for various kinds of bi-(benz)imidazole metal complexes, is of paramount importance for this and further studies, as it can provide a spectroscopic tool for the direct observation of proton release from these molecules.…”