15746-57-3Relevant articles and documents
Krause, Ronald A.
, p. 241 - 242 (1978)
Ligand selective monosubstitution with complete enantiomeric retention in ruthenium bis(bipyridine) complexes
Hesek,Hembury,Drew,Taniguchi,Inoue
, p. 2478 - 2479 (2001)
Ligand selective monosubstitution with complete enantiomeric retention in Δ and Λ-cis-[Ru(bpy)2(DMSO)(Cl)]PF6 has been achieved photochemically. Irradiation in the presence of various ligands, including 4,4′-bipyridine, results in th
Observation of cascade f → d → f energy transfer in sensitizing near-infrared (NIR) lanthanide complexes containing the Ru(ii) polypyridine metalloligand
Zhang, Lu-Yin,Li, Kang,Pan, Mei,Fan, Ya-Nan,Wang, Hai-Ping,Su, Cheng-Yong
, p. 5379 - 5386 (2016)
Distinguishable d → f or f → d energy transfer processes depending on lanthanide ions are observed in isomorphous d-f heterometallic complexes containing the Ru(ii) metalloligand (LRu), which lead to sensitized NIR emission (for Nd3+ and Yb3+) or enhanced red emission of LRu (for Eu3+ and Tb3+), and represent the first eye-detectable evidence of f → d energy transfer processes in Ln-Ru bimetallic complexes. Based on the systematic luminescence and decay lifetime study, cascade f → d → f energy transfer has been proposed in Ln1-Ru-Ln2 trimetallic systems for improved NIR sensitization.
Vibrational spectroscopy of the electronically excited state. 5. Time-resolved resonance Raman study of tris(bipyridine)ruthenium(II) and related complexes. Definitive evidence for the "localized" MLCT state
Bradley, Paul G.,Kress, Nurit,Hornberger, Boyce A.,Dallinger, Richard F.,Woodruff, William H.
, p. 7441 - 7446 (1981)
Time-resolved resonance Raman (TR3) spectra of the emissive and photochemically active metal-to-ligand charge-transfer (MLCT) electronic states of Ru(bpy)32+, Os(bpy)32+, and related complexes are rep
Design, synthesis, structural characterization and in vitro cytotoxic activity of mononuclear Ru(II)complexes
Thota, Sreekanth,Vallala, Srujana,Yerra, Rajeshwar,Rodrigues, Daniel Alencar,Barreiro, Eliezer J.
, p. 2127 - 2132 (2016)
The synthesis and characterization of ruthenium complexes (Ru-1–Ru-6) of the type [Ru(R)2(K)]2+ (where R = 1,10-phenanthroline/2,2′-bipyridyl and K = acetyl coumarin-inh, pyrazole-tch, acetyl coumarin-tsz, are described. These ligand
Formation of Optically Active (bipy = 2,2'-bipyridyl) by Photodissociation of Cl2 in Dichloromethane
Yamagishi, Akihiko,Naing, Kyaw,Goto, Yasutomo,Taniguchi, Masahiro,Takahashi, Masayuki
, p. 2085 - 2090 (1994)
An optically active bis-chelated complex, (bipy = 2,2'-bipyridyl), has been obtained when enantiomeric Cl2 was illuminated by visible light in dichloromethane.From the dependence of the optical purity of the product on light intensity, it is proposed that the reaction from Δ-Cl2 to Δ- (chirality retention) proceeds by way of the dissociation of a monodentate ligand, bipy*, from a photoactivated intermediate, Δ-*)Cl>Cl in the dark, while the reaction to Λ- (chirality inversion) involves the further photoactivated configurational change of Δ-*)Cl>Cl to Λ-*)Cl>Cl.Racemization is avoided under the conditions of weak light and high temperature.The synthetic value of optically active as a chiral intermediate has been exemplified by preparing a new chiral amphiphilic ruthenium(II) complex.
Ruthenium-bipyridine complexes bearing fullerene or carbon nanotubes: Synthesis and impact of different carbon-based ligands on the resulting products
Wu, Zhen-Yi,Huang, Rong-Bin,Xie, Su-Yuan,Zheng, Lan-Sun
, p. 8353 - 8360 (2011)
This paper discusses the synthesis of two carbon-based pyridine ligands of fullerene pyrrolidine pyridine (C60-py) and multi-walled carbon nanotube pyrrolidine pyridine (MWCNT-py) via 1,3-dipolar cycloaddition. The two complexes, C60-Ru and MWCNT-Ru, were synthesized by ligand substitution in the presence of NH4PF6, and Ru(ii)(bpy)2Cl2 was used as a reaction precursor. Both complexes were characterized by mass spectroscopy (MS), elemental analysis, nuclear magnetic resonance (NMR) spectroscopy, infrared spectroscopy (IR), ultraviolet/visible spectroscopy (UV-VIS) spectrometry, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and cyclic voltammetry (CV). The results showed that the substitution way of C 60-py is different from that of MWCNT-py. The C60-py and a NH3 replaced a Cl- and a bipyridine in Ru(ii)(bpy) 2Cl2 to produce a five-coordinate complex of [Ru(bpy)(NH3)(C60-py)Cl]PF6, whereas MWCNT-py replaced a Cl- to generate a six-coordinate complex of [Ru(bpy) 2(MWCNT-py)Cl]PF6. The cyclic voltammetry study showed that the electron-withdrawing ability was different for C60 and MWCNT. The C60 showed a relatively stronger electron-withdrawing effect with respect to MWCNT. The Royal Society of Chemistry 2011.
New supramolecular structural motif coupling a ruthenium(II) polyazine light absorber to a rhodium(I) center
Zhou, Rongwei,Sedai, Baburam,Manbeck, Gerald F.,Brewer, Karen J.
, p. 13314 - 13324 (2013)
Two new complexes, [(bpy)2Ru(dpp)RhI(COD)](PF 6)3 and [(Me2bpy)2Ru(dpp)Rh I(COD)](PF6)2(BF4) (bpy = 2,2′-bipyridine, Me2bpy = 4,4′-dimethyl-2,2′- bipyridine, dpp = 2,3-bis(2-pyridyl)pyrazine, and COD = 1,5-cyclooctadiene), representing a new Ru(II),Rh(I) structural motif, have been prepared and characterized by mass spectrometry, 1H NMR spectroscopy, electrochemistry, electronic absorption spectroscopy, and emission spectroscopy. These two complexes represent a new type of supramolecular complex with a [(TL)2Ru(dpp)]2+ (TL = terminal ligand) light absorber (LA) coupled to a Rh(I) center and are models for Ru(II),Rh(I) intermediates in the photochemical reduction of water using dpp-bridged Ru(II),Rh(III) photocatalysts. Electrochemical study reveals overlapping reversible Ru II/III and irreversible RhI/II/III oxidations and a quasi-reversible dpp0/- reduction, demonstrating that the lowest unoccupied molecular orbital (LUMO) is dpp(π*) based. The COD ligand is sterically bulky, displaying steric repulsions between hydrogen atoms on the alkene of COD and dpp about the square planar Rh(I) center. An interesting reactivity occurs in coordinating solvents such as CH3CN, where Rh(I) substitution leads to an equilibrium between the Ru(II),Rh(I) bimetallic and [(TL)2Ru(dpp)]2+ and [RhI(COD)(solvent) 2]+ monometallic species. The electronic absorption spectra of both complexes feature transitions at ca. 500 nm attributed to a Ru(dπ) → dpp(π*) metal-to-ligand charge transfer (MLCT) transition that is slightly red-shifted from the Ru synthon upon Rh(I) complexation. The methylation of TL on the Ru impacts the electrochemical and optical properties in a minor but predictable manner. The photophysical studies, by comparison with the model complex [{Ru(bpy)2}2(dpp)] (PF6)4 and related Rh(III) complex [(bpy) 2Ru(dpp)RhIIICl2(phen)](PF6) 3, reveal the expected absence of a Ru(dπ) → Rh(dσ*) 3MMCT state (metal-to-metal charge transfer) in the title complexes, which is present in Rh(III) systems. The absence of this 3MMCT state in Ru(II),Rh(I) complexes results in a longer lifetime and higher emission quantum yield for the Ru(dπ) → dpp(π*) 3MLCT state than [(bpy)2Ru(dpp)RhIIICl 2(phen)](PF6)3. Both complexes display photocatalytic hydrogen production activity in the presence of water and a sacrificial electron donor, with the [(bpy)2Ru(dpp)Rh I(COD)](PF6)3 possessing a higher catalytic activity than the methyl analogue. Both display low activities, hypothesized to occur due to steric crowding about the Rh(I) site.
A self-deformable gel system with asymmetric shape change based on a gradient structure
Li, Jie,Li, Xiuchen,Xu, Guohe,Zheng, Zhaohui,Deng, Jinni,Ding, Xiaobin
, p. 11594 - 11597 (2018)
A self-deformable gel system is constructed by coupling a gradient structured gel with a chemical oscillating reaction. The system exhibits periodic and asymmetric shape change. The asymmetric shape change of the gel is based on the gradient structure.
Anthracene-bridged binuclear ruthenium complexes: Electrochemical and spectroscopic evidence of electronic communication through the Π system
Vila, Neus,Zhong, Yu-Wu,Henderson, Jay C.,Abrun, Hector D.
, p. 796 - 804 (2010)
Six dinuclear cyclometalated ruthenium complexes, 1-6, based on diphenylanthracene (DPA) and anthracene (AN) as bridging ligands have been synthesized and fully characterized electrochemically and spectroscopically. The anodic electrochemistry of the homobinuclear ruthenium complexes, 1 -6, has been examined in three different nonaqueous solvents (ACN, DMF, and CH 2CI2). The ability of the anthracene derivatives to transmit electronic effects between the two redox units has been demonstrated by the observed splitting of the voltammetric signals ascribed to the metal centers. The electronic communication has also been evidenced by the presence of intervalence charge transfer transition bands in the near-infrared region of the spectrum due to an intramolecular electron transfer process mediated by the bridge when the mixed valence species (RuII/RuIII) are electrochemically generated. Cyclic voltammetric measurements have been carried out under different conditions of solvent and supporting electrolyte. Differences in ?,E°′ the potential separation of the formal potentials of the metal-based anodic processes, have been observed and found to depend on the medium employed. These differences have been ascribed to different degrees of ion pairing. Such effects can be, in turn, modulated as a function of not only the polarity and donor strength of the solvent but also of the coordinating capacity of the anion employed as a supporting electrolyte.
Photocatalytic reduction of carbon dioxide to methanol using a ruthenium trinuclear polyazine complex immobilized on graphene oxide under visible light irradiation
Kumar, Pawan,Sain, Bir,Jain, Suman L.
, p. 11246 - 11253 (2014)
A ruthenium trinuclear polyazine complex was synthesized and subsequently immobilized through complexation to a graphene oxide support containing phenanthroline ligands (GO-phen). The developed photocatalyst was used for the photocatalytic reduction of CO2 to methanol, using a 20 watt white cold LED flood light, in a dimethyl formamide-water mixture containing triethylamine as a reductive quencher. After 48 h illumination, the yield of methanol was found to be 3977.57 ± 5.60 μmol gcat -1. The developed photocatalyst exhibited a higher photocatalytic activity than graphene oxide, which provided a yield of 2201.40 ± 8.76 μmol gcat-1. After the reaction, the catalyst was easily recovered and reused for four subsequent runs without a significant loss of catalytic activity and no leaching of the metal/ligand was detected during the reaction.
Physical, spectroscopic, and biological properties of ruthenium and osmium photosensitizers bearing diversely substituted 4,4′-di(styryl)-2,2′-bipyridine ligands
Cariou, Kevin,Gasser, Gilles,Karges, Johannes,Tharaud, Micka?l,Vinck, Robin
, p. 14629 - 14639 (2021/11/03)
Capitalising on the previous identification of a distyryl coordinated Ru(ii) polypyridine complex as a promising photosensitizer for photodynamic therapy, eight new complexes were synthesized by modifications of the ligands or by changing the metal coordinated. We report in this work the effects of these modifications on the physical, spectroscopic, and biological properties of the synthesized complexes. Subtle structural modifications of the distyryl ligand only had a moderate effect on the corresponding complexes' visible light absorption and singlet oxygen quantum yield. These modifications however had a significant effect on the lipophilicity, the cellular uptake and the phototoxicity of the complexes. Although the lipophilicity of the complexes had a somewhat expected effect on their cellular uptake, this last parameter could not be directly correlated to their phototoxicity, revealing other underlying phenomena. Overall, this work allowed identification of two promising ruthenium complexes as photosensitisers for photodynamic therapy and provides some guidance on how to design better photosensitizers. This journal is
Time Resolved Ligand Loss: Flash Photolysis and UV–Vis Spectroscopic Studies of cis-[Ru(bpy)2(py)2]2+ Complex
Rahman, Mohammad Aminur
, p. 2341 - 2347 (2021/11/11)
Abstract: A preliminary study on photoinduced ligand loss from [Ru(bpy)2(py)2]2+ has been made. The photolysis of cis-[Ru(bpy)2(py)2]2+ in the presence of trifluoroacetic acid, using broad band, white light excitation, leads to a shift in λmax from 458 nm to 472 nm, consistent with a substitution reaction of the pyridine by THF. A flash photolysis study was also performed to investigate the excited state changes of [Ru(bpy)2(py)2]2+ in THF.
