Preparation and investigation of the spectral and electrochemical properties of mixed-ligand ruthenium(II) complexes containing 1,8-naphthyridines

Staniewicz, Robert J.; Sympson, R. F.; Hendricker, David G.

doi:10.1021/ic50175a004

Cited by 52 publications

(20 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure 4, quasi-reversible peaks corresponding to the [Ru(phen) 2 (dC18bpy)] 2+ /[Ru(phen) 2 (dC18bpy)] 3+ redox couple at 1120 (oxidation) and 1100 mV were not observed clearly, when single-layered TiO 2 -Ru hybrid film was transferred onto ITO electrode (see curve 1). Upon changing the number of layers from 1 to 3 and 5, the above quasi-reversible peaks become apparent due to the increase of the concentration of Ru complex (see curves 2 and 3), which is in good agreement with the earlier study on an ITO electrode modified with mono-/multi-layered Clay/[Ru (phen) 2 (dC18bpy)] 2+ hybrid films [42,43]. Moreover, compared with curve 1 and curve 2 or 3 at E < 1000 mV, the redox current decreases with the increase of the number of layers, suggesting that the electron transfer occurs directly through the electrochemically inactive TiO 2 layer.…”

Section: Film Characterizationsupporting

confidence: 91%

Electrocatalytic oxidation of GMP on an ITO electrode modified by the photodeposition of Pd nanoparticles onto a monolayer TiO2 nanosheets/[Ru(phen)2(dC18bpy)]2+ hybrid film

et al. 2011

View full text Add to dashboard Cite

An indium tin oxide (ITO) electrode coated with monolayer TiO 2 /[Ru(phen) 2 (dC18bpy)] 2+ (phen = 1,10-phenanthroline, dC18bpy = 4,4′-dioctadecyl-2,2′-bipyridyl) hybrid film (denoted as ITO/TiO 2 -Ru) has been prepared using the modified Langmuir-Blodgett (LB) method, and the electrocatalytic oxidation of mononucleotide of guanosine 5′-monophosphate (GMP) on an ITO/TiO 2 -Ru electrode after Pd-photodeposition (denoted as ITO/TiO 2 -Ru/Pd) has been studied. Atomic force microscopy reveals that the single-layered hybrid film of TiO 2 nanosheets/[Ru(phen) 2 (dC18bpy)] 2+ is closely packed at a surface pressure of 25 mN m 1 and has a thickness of (3.20 ± 0.5) nm. X-ray photoelectron spectra show the formation of Pd nanoparticles on the surface of hybrid film with radii of 20-200 nm by the reduction of [Pd(NH 3 ) 4 ] 2+ under light irradiation. When it is applied to oxidize GMP, a larger catalytic oxidative current is achieved on the ITO/TiO 2 -Ru/Pd electrode at the external potential above 700 mV (vs. Ag|AgCl|KCl) in comparison with the naked ITO electrode and ITO/TiO 2 -Ru electrode. Such a result indicates that the Pd nanoparticles are able to hamper the combination of electron hole pairs and reduce the counterwork of insulating long alkyl chains of amphiphilic Ru(II) complexes, and thus develops the electron transfer efficiency and produces the enhanced redox current.Langmuir-Blodgett method, TiO 2 /[Ru(phen) 2 (dC18bpy)] 2+ hybrid film, Pd nanoparticles, modified electrode, electrocatalysis

show abstract

Section: Film Characterizationsupporting

confidence: 91%

Electrocatalytic oxidation of GMP on an ITO electrode modified by the photodeposition of Pd nanoparticles onto a monolayer TiO2 nanosheets/[Ru(phen)2(dC18bpy)]2+ hybrid film

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Complex 3 displays np 1 ππ* 1 IL transitions with maxima at 300 nm (ε = 24,900 M −1 cm −1 ), a value that agrees with other transition metal complexes coordinated to np. [40,43] The dap-containing complex 4 exhibits dap 1 ππ* 1 IL transitions with maxima at 262 nm (ε = 79,500 M −1 cm −1 ) and 318 nm (ε = 30,300 M −1 cm −1 ). [22,44] In the visible region, the np-bridged complex 3 exhibits two well-resolved transitions with Figure 6.…”

mentioning

confidence: 99%

Electronic influences of bridging and chelating diimine ligand coordination in formamidinate-bridged Rh2(II,II) dimers

et al. 2016

View full text Add to dashboard Cite

Two new formamidinate-bridged Rh 2 II,II complexes, cis-[Rh 2 II,II (µ-DTolF) 2 (µ-np) 2 ] 2+ (3; DTolF = N,N′-dip -tolylformamidinate; np = 1,8-naphthyridine) and cis-[Rh 2 II,II (µ-DTolF) 2 (κ 2-dap) 2 ] 2+ (4; dap = 1,12-diazaperylene), were synthesized from [Rh 2 II,II (µ-DTolF) 2 (CH 3 CN) 6 ](BF 4) 2 (1), and their properties were compared to those of [Rh 2 II,II (µ-DTolF) 2 (phen) 2 ](BF 4) 2 (2). Density functional theory (DFT) and electrochemical analyses support the description of the highest occupied molecular orbitals (HOMOs) of 3 and 4 as possessing contributions from the metals and formamidinate bridging ligands, with Rh 2 /form character, and lowest unoccupied molecular orbitals (LUMOs) localized on the respective diimine ligand np and dap π* orbitals. Both 3 and 4 display strong, low energy Rh 2 /formdiimine(π*) metal/ligand-to-ligand charger transfer (1 ML-LCT) transitions with maxima at 566 nm (ε = 3,600 M −1 cm −1) for 3 and at 630 nm (ε = 2,900 M −1 cm −1) for 4 in CH 3 CN. Time dependent-DFT (TD-DFT) calculations support these assignments. The ability of both the bridging np and chelating dap diimine ligands to produce strong absorption of these Rh 2 II,II complexes throughout the visible region is potentially useful for the development of new photocatalysts for H 2 production and photochemotherapeutics.

show abstract

“…Such hybrid film was quite stable and suitable to determining the electro-transfer route in CMEs on a monolayer scale [28] . Figure 2 presents the cyclic voltammograms of ITO/Ru [37,38] . There is a sharp increase in the redox current when the same ITO/Ru electrode was placed in a phosphate buffer solution (pH 6.84), which is accompanied with the disappearance of the reversible peaks of [Ru(phen) 2 (dC18bpy)] 2+ /[Ru(phen) 2 (dC18bpy)] 3+ (see curve 2).…”

Section: Film Characterizationmentioning

confidence: 99%

Photoelectrocatalytic oxidation of GMP on an ITO electrode modified with clay/[Ru(phen)2(dC18bpy)]2+ hybrid film

Chang

Wang

Lin

et al. 2009

Sci. China Ser. B-Chem.

View full text Add to dashboard Cite

An indium tin oxide (ITO) electrode modified with monolayer clay/[Ru(phen) 2 (dC18bpy)] 2+ (phen= 1,10-phenanthroline, dC18bpy = 4,4′-dioctadecyl-2,2′ bipyridyl) hybrid film has been fabricated by the Langmuir-Blodgett (LB) method. Atomic force microscopy revealed that the single-layered hybrid film of clay/[Ru(phen) 2 (dC18bpy)] 2+ (denoted as Clay-Ru) was closely packed at a surface pressure of 25 mN⋅m −1 and had a thickness of 3.4±0.5 nm. Cyclic voltammograms showed that the redox current of Ru(Ⅱ) complex decreased when incorporated into the clay film, suggesting that the clay layer acts as a barrier against electron transfer. When applied to oxidizing the mononucleotide of guanosine 5′-monophosphate (GMP), a large catalytic oxidative current was achieved on the Clay-Ru(Ⅱ) modified ITO electrode at the external potential above 900 mV (vs. Ag|AgCl|KCl ) and, more significantly, this response was further enhanced by light irradiation (λ>360 nm), in which the photocurrent is increased about 11 times in comparison with that of a bare ITO. Mechanism of the photoelectrocatalytic effect was proposed in terms of the reduction of the photoelectrochemically generated Ru(Ⅲ) complex in the Clay-Ru film by GMP.clay-modified electrodes, Langmuir-Blodgett method, hybrid film, photocurrent

show abstract

Preparation and investigation of the spectral and electrochemical properties of mixed-ligand ruthenium(II) complexes containing 1,8-naphthyridines

Cited by 52 publications

References 12 publications

Electrocatalytic oxidation of GMP on an ITO electrode modified by the photodeposition of Pd nanoparticles onto a monolayer TiO2 nanosheets/[Ru(phen)2(dC18bpy)]2+ hybrid film

Electrocatalytic oxidation of GMP on an ITO electrode modified by the photodeposition of Pd nanoparticles onto a monolayer TiO2 nanosheets/[Ru(phen)2(dC18bpy)]2+ hybrid film

Electronic influences of bridging and chelating diimine ligand coordination in formamidinate-bridged Rh2(II,II) dimers

Photoelectrocatalytic oxidation of GMP on an ITO electrode modified with clay/[Ru(phen)2(dC18bpy)]2+ hybrid film

Contact Info

Product

Resources

About