Synthesis and protonation-deprotonation reactions of ruthenium(II) complexes containing 2, 2′-bibenzimidazole and related ligands

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).…”

“…[18][19][20][21] Also, several synthetic modifications have been reported for the manipulation of the electronic and steric properties of these ligands. [22][23][24][25][26] Manipulations of the 4,4′-positions are of particular interest as they define a pincerlike pocket around the hydrogen-bond moiety.…”

New [Ru(5,6-dmp/3,4,7,8-tmp)2(diimine)]2+ complexes: Non-covalent DNA and protein binding, anticancer activity and fluorescent probes for nuclear and protein components

“…In 5% DMF/5 mM Tris-HCl/50 mM NaCl buffer at pH 7.1 all the complexes display a high energy intra-ligand π-π* band (234-386 nm, Table 1) [35] and the MLCT bands (420-475 nm, Table 1), which are typical of Ru(II) complexes with coordinated polyimine ligands [12]. The MLCT band energies (420-424 nm) of the tmp complexes 4-6 are higher than those for the 5,6-dmp complexes 1-3 (445-453 nm), possibly because the incorporation of four electron-releasing methyl groups to obtain 4-6 enhances the electron density on Ru(II), leading to the raise in energy of Ru(II) dπ orbitals and hence the observation of the MLCT band involving the co-ligands at lower energy.…”

Interaction of Λ- and Δ-[Ru(bpy)2(pbmz)](PF6)2 with the oligonucleotide duplex d(CGCGAATTCGCG)2

“…The complex rac-[Ru(bpy) 2 (pbmz)](ClO 4 ) 2 has been synthesized earlier, by the reaction between the cis-[Ru-(bpy) 2 Cl 2 ] and pbmz [19]. Our synthesis was based on the optically pure precursors D-and K-[Ru(bpy) 2 (py) 2 ]-(C 18 H 14 O 8 ) AE 12H 2 O by replacing the two pyridine molecules with the ligand pbmz in ethylene glycol/H 2 O (9:1) solution at 120°C, under a stream of argon to prevent the oxidation of Ru(II).…”