title: Synthesis and photophysical and electrochemical properties of functionalized mono-, bis-, and trisanthracenyl bridged Ru(II) bis(2,2':6',2"-terpyridine) charge transfer complexes.
abstract: With the aim of developing new molecular devices having long-range electron transfer in artificial systems and as photosensitizers, a series of homoleptic ruthenium(II) bisterpyridine complexes bearing one to three anthracenyl units sandwiched between terpyridine and 2-methyl-2-butenoic acid group are synthesized and characterized. The complexes formulated as bis-4'-(9-monoanthracenyl-10-(2-methyl-2-butenoic acid) terpyridyl) ruthenium(II) bis(hexafluorophosphate) (RBT1), bis-4'-(9-dianthracenyl-10-(2-methyl-2-butenoic acid) terpyridyl) ruthenium(II) bis(hexafluorophosphate) (RBT2), and bis-4'-(9-trianthracenyl-10-(2-methyl-2-butenoic acid) terpyridyl) ruthenium(II) bis(hexafluorophosphate) (RBT3) were characterized by elemental analysis, FT-IR, UV-Vis, photoluminescence, (1)H and (13)C NMR spectroscopy, and electrochemical techniques by elemental analysis, FT-IR, UV-Vis, photoluminescence, (1)H and (13)C NMR spectroscopy, and electrochemical techniques. The cyclic voltammograms (CVs) of (RBT1), (RBT2), and (RBT3) display reversible one-electron oxidation processes at E 1/2 = 1.13 V, 0.71 V, and 0.99 V, respectively (versus Ag/AgCl). Based on a general linear correlation between increase in the length of π-conjugation bond and the molar extinction coefficients, the Ru(II) bisterpyridyl complexes show characteristic broad and intense metal-to-ligand charge transfer (MLCT) band absorption transitions between 480-600 nm, ε = 9.45 × 10(3) M(-1) cm(-1), and appreciable photoluminescence spanning the visible region.
authors.affiliation: Department of Chemistry, Faculty of Science and Agriculture, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa.
authors.forename: Adewale O
authors.initials: AO
authors.lastname: Adeloye
authors.affiliation: Department of Chemistry, Faculty of Science and Agriculture, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa.
authors.forename: Peter A
authors.initials: PA
authors.lastname: Ajibade
mesh_terms: D058266:Dielectric Spectroscopy; D004563:Electrochemistry / Q000379:methods; D009682:Magnetic Resonance Spectroscopy; D010777:Photochemistry / Q000379:methods; D017319:Photosensitizing Agents / Q000138:chemical synthesis / Q000737:chemistry; D017975:Ruthenium Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D012993:Solar Energy; D013055:Spectrophotometry, Infrared
chemical_list: D017319:Photosensitizing Agents; D017975:Ruthenium Compounds