Topic
Ruthenium
About: Ruthenium is a research topic. Over the lifetime, 40184 publications have been published within this topic receiving 996514 citations. The topic is also known as: Ru & element 44.
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TL;DR: Glyphosate, a phosphorus-containing amino acid type herbicide was used as a coreactant for studying of electrochemiluminescence (ECL) reaction of tris(2,2′-bipyridyl)ruthenium(II) [Ru(bpy) 3 2+ ] in an aqueous solution.
29 citations
TL;DR: Alkylidenecyclopropanes containing a chelation assistant at the terminal carbon atom of the olefinic moiety undergo an Os- or Ru-promoted ring expansion reaction to afford metal cyclobutylidene derivatives.
Abstract: Alkylidenecyclopropanes containing a chelation assistant at the terminal carbon atom of the olefinic moiety undergo an Os- or Ru-promoted ring expansion reaction to afford metal cyclobutylidene derivatives. The process occurs through a novel mechanism that implies a 1,2-migration of a CH(2) group of the three-membered ring from an olefinic carbon atom to the other one. It takes place, without direct participation of the metal, on a metallaheterocyclopentene intermediate which is generated from an eta(2)-methylenecyclopropane species stabilized by coordination of the chelation assistant.
29 citations
TL;DR: Temperature-dependent lifetime measurements indicate that the excited state decays via two thermally accessible upper states within the zeolite supercages, as well as spectral results confirm the identity of the entrapped complex.
Abstract: The heteroleptic ruthenium(II) complex Ru(bpy)2(dpp)2+ (where bpy = 2,2‘-bipyridine and dpp = 2,3-bis(2-pyridyl)pyrazine) has been prepared in the supercages of Y-zeolite and characterized by diffuse reflectance, electronic absorption, electronic emission, and resonance Raman (RR) spectroscopy, as well as lifetime measurements. The spectral results confirm the identity of the entrapped complex. The diffuse reflectance spectrum of the zeolite-entrapped complex is slightly red-shifted in the visible region compared to the absorption spectrum of the free complex in water solution. The emission maximum for the zeolite-entrapped complex is red-shifted by 16 nm with respect to the complex in water solution and by 38 nm relative to the complex in acetonitrile solution. The emission maximum for a zeolite surface-adsorbed complex is blue-shifted by 12 nm with respect to the complex in water solution, but the emission maxima of the liberated complex after dissolution of the zeolite matrix, for both the entrapped an...
29 citations
TL;DR: In this paper, the structure of the solvate complex (1)·6CHCl3 was revealed using the single crystal X-ray diffraction method and the crystal packing showed that the weak intermolecular interactions played an essential role in the formation of stable assemblies and their organization within the crystals.
Abstract: Ruthenium(II) tetra-15-crown-5-phthalocyaninate with axially coordinated molecules of pyrazine [(15C5)4Pc]Ru(pyz)2 (1) was synthesized from a carbonyl complex [(15C5)4Pc]Ru(CO)(MeOH) (2), and the structure of the solvate complex (1)·6CHCl3 was revealed using the single crystal X-ray diffraction method. Analysis of the crystal packing showed that the weak intermolecular interactions, such as CH⋯π, CH⋯N, CH⋯O and CH⋯Cl, played an essential role in the formation of stable assemblies and their organization within the crystals. The interplay between the intramolecular axial coordinated pyrazine contacts and the weak intermolecular interactions of solvate molecules with crown-ether fragments provided the basis for rationalizing the observed self-assembly of molecules in solutions of tetrachloroethane and polymeric composites with polyvinylcarbazole. The self-assembly was investigated using UV-Vis spectroscopy, dynamic light scattering measurements, atomic force microscopy and transmission electron microscopy techniques. The formation of nanoparticles of complex (1) from a tetrachloroethane solution after three cycles of heating to 70 °C/cooling to 5 °C and two days storage was proved. Thin films (7 μm) of polymeric composites with polyvinylcarbazole prepared from a solution containing nanoparticles exhibited a nonlinear optical response measured by the Z-scan technique with application of femtosecond (1030 nm) and nanosecond (1064 nm) pulse lasers. The measured third-order susceptibility (χ(3)) of the polyvinylcarbazole composite with 4 wt% of complex (1) was equal to 1.94 × 10−10 esu, while the same composite prepared without the previously described special treatment had zero susceptibility. This result proves the essential role of self-assembly in future development of nonlinear optical materials.
29 citations
TL;DR: In this article, the diffusion coefficient and the apparent rate of charge transfer have been determined for various ruthenium and iron complexes in an acetonitrile solution by using a rotating disk electrode (RDE) method.
Abstract: The diffusion coefficient and the apparent rate of charge-transfer have been determined for various ruthenium and iron complexes in an acetonitrile solution by using a rotating disk electrode (RDE) method. The diffusion coefficients of [Ru(bpy)3]2+, [Ru(acac)3], and [Fe(bpy)3]2+ (bpy: 2,2′-bipyridine, acac: acetylacetone), being similar to each other, were about 2×10−10 m2 s−1 in acetonitrile containing 0.1 mol dm−3 (C2H5)4NBF4. The apparent rate of electrochemical oxidation increased in the order [Ru(bpy)3]2+<[Ru(acac)3]<[Fe(bpy)3]2+. The order of the rates was reciprocal to the order of their oxidation potentials in the same electrolyte.
29 citations