101895-77-6Relevant articles and documents
Recognition between V- and dumbbell-shaped molecules
Wong, Wing-Yan,Lee, Siu-Fung,Chan, Hoi-Shan,Mak, Thomas C.W.,Wong, Chi-Hin,Huang, Lau-Shan,Stoddart, J. Fraser,Leung, Ken Cham-Fai
, p. 26382 - 26390 (2013)
A series of 2,6-bis(imino)pyridyl-based V-shaped compounds bearing various para-substituents on the terminal aromatic rings [C5H 3N(CHN-C6H4R)2; R = OMe, iPr, Me, H, Cl, F, and CF3] have been prepared and investigated for their reversible binding with the dumbbell-shaped cations NH2+-{CH2-C6H3(OMe-3,5) 2}2 and 9-anthryl-CH2-NH2 +-CH2-C6H3(OMe-3,5)2. Three crystalline V-shaped compounds and a dumbbell hexafluorophosphate were characterised in the solid state by X-ray structural analysis. The binding mode of the 1 : 1 V-shaped molecule·dumbbell complexes was evaluated by 1H NMR spectroscopy. The binding constants (90-400 M-1 in dichloromethane) and stoichiometries of the complexes were determined using the Method of Continuous Variations and the Rose-Drago Method based on 1H NMR spectroscopic data. In a series of V-shaped compounds, the binding strength with both dumbbell cations diminishes with the decreasing electron-donating ability of the R substituents. Specifically, one of the diimine V-shaped compounds shows a stronger binding with the symmetrical dumbbell than with the unsymmetrical anthracene-containing dumbbell. Fluorescence measurements of equimolar mixtures of the V-shaped compounds and the unsymmetrical dumbbell have revealed a reduced anthracene emission which is approximately 50% that of the original intensity. Rapid and complete dissociation (5 min) of the V-shaped compounds from the dumbbells was realised using an excess of acid or base, whereas only partial dissociation of the complexes was achieved with a large excess of water (1 h).
Supramolecular polymerization provides non-equilibrium product distributions of imine-linked macrocycles
Strauss, Michael J.,Evans, Austin M.,Castano, Ioannina,Li, Rebecca L.,Dichtel, William R.
, p. 1957 - 1963 (2020)
Supramolecular polymerization of imine-linked macrocycles has been coupled to dynamic imine bond exchange within a series of macrocycles and oligomers. In this way, macrocycle synthesis is driven by supramolecular assembly, either into small aggregates su
Structural, spectral, and photoreactivity properties of mono and polymetallated-2,2′-bipyridine ruthenium(II) complexes
Campos, Renan Borsoi,Ferrarini, André,Nunes, Fábio Souza,Rebecchi Rios, Rafaella,Santana, Francielli Sousa,Soek, Rafael Natan,da Silva, Roberto Santana
, (2022/01/12)
Polymetallated-2,2′-bipyridine–ruthenium(II) complexes exhibit photosensitization properties and can enhance optically induced NO release, thus modeling multi-site catalysts. Two novel ruthenium-nitrosyl complexes [RuCl2LA(NO)]PF6 (herein called RuLANO, LA = 2,6-bis[(aniline)methyl]-pyridine) and [RuCl2(NO)({Ru(bpy)2}2-μ-LB)](PF6)5 (herein called Ru3LBNO, LB = 2,6-bis[(1,10-phenantroline-5-amine)methyl]-pyridine) were prepared and structurally characterized (1H-, 13C-, DEPT-135 NMR, FTIR, UV–Vis, elemental analysis, ESI-HRMS, and single crystal x-ray diffraction). RuLANO showed a trans configuration of the chloride ligands, and photo-release of chloride is the major process upon irradiation of RuLANO at 377 nm, along with some NO dissociation to a small extent. In contrast, the trinuclear ruthenium complex Ru3LBNO was found to be photo-inactive with irradiation between 377 and 447 nm (region of absorption of the {Ru(bpy)2(phen)}2+ chromophore) in the same conditions of RuLANO. This result agrees with the strong stabilization of Rucentral dxy, dxz, and dyz orbitals as shown by calculations using density functional theory (DFT), as well as with the electrochemical response, which supports that there is no major electronic communication between the central and the peripherals ruthenium ions in the trinuclear complex.
