Academic literature on the topic 'Chemistry - complex di ruthenium'
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Journal articles on the topic "Chemistry - complex di ruthenium"
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BATALINI, C., and W. F. DE GIOVANI. "SYNTHESIS AND CHARACTERIZATION OF A NEW RUTHENIUM (II) DIARSINIC AQUACOMPLEX." Periódico Tchê Química 16, no. 32 (August 20, 2019): 130–38. http://dx.doi.org/10.52571/ptq.v16.n32.2019.148_periodico32_pgs_130_138.pdf.
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Ruthenium complexes are used as catalysts, energy converters, some have biological activity, among other applications. The ruthenium chemistry reserves remarkable stability when complexed with organic ligands, mainly bipyridine and tripyridine. Ruthenium polypyridine aquacomplexes have acted as excellent electrocatalysts in the conversion of organic substances, since they offer interesting patterns of binding with ruthenium. The preparation of ruthenium aquacomplexes combining tripyridine and bidentate arsine ligands is not officially described. Good advantages have been found when using ligands containing mixed mono, di or tripyridines with bidentate ligands in their coordination sphere, such as the verified stability of these complexes, without loss of ligands during the process and the possibility of better stereochemical control during the synthesis of these complexes. This work stands out the synthesis, in three stages, of a new ruthenium tripyridine complex containing a bidentate arsine: [Ru(L)(totpy)(OH2)](ClO4)2 (L=Ph2AsCH2CH2AsPh2); (totpy=4'-(4-tolyl)-2,2':6',2''-terpyridine). Each step of the synthetic route showed a significant reaction yield and the voltammetric, spectroscopic and microanalytical characterization results point positively to the proposed chemical structure of the complex.
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Unjaroen, Duenpen, Johann B. Kasper, and W. R. Browne. "Reversible photochromic switching in a Ru(ii) polypyridyl complex." Dalton Trans. 43, no. 45 (2014): 16974–76. http://dx.doi.org/10.1039/c4dt02430c.
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Fully reversible photoswitching of the coordination mode of the ligand MeN4Py (1,1-di(pyridin-2-yl)-N,N′-bis(pyridin-2-yl-methyl)-ethan-1-amine) in its ruthenium(ii) complex with visible light is reported.
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Shimizu, Eiza, and Derrick Ethelbhert Yu. "Synthesis of Highly Soluble Axially-Ligated Ruthenium(III) Phthalocyanine Salt: Potassium Dithiocyanato(phthalocyaninato)ruthenium(III)." Oriental Journal of Chemistry 34, no. 6 (November 10, 2018): 3157–60. http://dx.doi.org/10.13005/ojc/340664.
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Partially-oxidized di-axially ligated Ruthenium(III) phthalocyanine crystalline salts are deemed to be highly conducting molecular solids with giant negative magnetoresistance. Solubility as a prerequisite for crystallization has always been a challenge especially in Ruthenium complexes. This paper presents the synthesis of highly soluble potassium dithiocyanato(phthalocyaninato(-2))ruthenium(III) salt from the poorly soluble dibromo(phthalocyaninato(-1))ruthenium(III) radical complex. The synthesis involves the reduction of the Phthalocyanine ligand and substitution of axial ligands utilizing potassium thiocyanide to afford the product.
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Mishra, Anurag, Sambandam Ravikumar, Young Ho Song, Nadarajan Saravanan Prabhu, Hyunuk Kim, Soon Ho Hong, Seyeon Cheon, Jaegeun Noh, and Ki-Whan Chi. "A new arene–Ru based supramolecular coordination complex for efficient binding and selective sensing of green fluorescent protein." Dalton Trans. 43, no. 16 (2014): 6032–40. http://dx.doi.org/10.1039/c3dt53186d.
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Weber, Immo, Frank W. Heinemann, Walter Bauer, and Ulrich Zenneck. "Configurational Flexibility of Epimeric β-Aminothioether-chelated Ruthenium(II) η6-Arene Complex Salts." Zeitschrift für Naturforschung B 64, no. 1 (January 1, 2009): 123–40. http://dx.doi.org/10.1515/znb-2009-0117.
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Five chiral β -aminothioethers were obtained via different routes orientated on literature protocols. Three of these β -aminothioethers were reacted with two di-μ-chloro-bis{chloro[η6-arene]- ruthenium(II)} derivatives, resulting in the title complex salts. The complex cations exhibit three stereocenters, viz. ruthenium and sulfur atoms and the chiral benzylic carbon atom of the chelate ligand backbone. Both, ruthenium and sulfur stereocenters epimerize into a mixture of four NMR distinguishable diastereomers in equilibrium, but the designed chiral benzylic carbon atom is stable under all conditions applied so far. The relative diastereomer concentrations in solution depend mainly on the spatial requirements of the η6-arene ligand rather than on the thioether moiety. Diastereomer ratios and the absolute configurations in solution were studied by NMR and CD spectroscopy. The spectroscopic results fit to the absolute X-ray crystal structure parameters determined for the diastereomers present in the crystalline state.
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Nakai, Akito, Takayuki Tanaka, and Atsuhiro Osuka. "Oxidation-Induced Detachment of Ruthenoarene Units and Oxygen Insertion in Bis-Pd(II) Hexaphyrin π-Ruthenium Complexes." Molecules 25, no. 12 (June 15, 2020): 2753. http://dx.doi.org/10.3390/molecules25122753.
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Two types of new bis-Pd(II) hexaphyrin π-ruthenium complexes are reported. A double-decker bis-Pd(II) hexaphyrin π-ruthenium complex 4 was obtained by oxidation-induced detachment of a ruthenoarene unit from the triple-decker complex 3 and oxygen-inserted triple-decker bis-Pd(II) hexaphyrin π-ruthenium complex 6 was obtained upon treatment of bis-Pd(II) [26]hexaphyrin 5 with [RuCl2(p-cymene)]2 under aerobic conditions. Although π-metal complexation of porphyrinoids often results in decreased global aromaticity due to the enhancement of local 6π aromatic segments, distinct aromatic characters were indicated for 4 and 6 by 1H-NMR spectral and theoretical calculations. These results are accounted for in terms of possible resonance contributors of hexaphyrin di- and tetraanion ligands. Thus, π-metal coordination has been shown to be effective for modulation of the overall aromaticity.
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Lu, Zhongkai, Yan Gao, Hu Chen, Zhao Liu, and Licheng Sun. "Water oxidation catalyzed by a charge-neutral mononuclear ruthenium(iii) complex." Dalton Transactions 46, no. 4 (2017): 1304–10. http://dx.doi.org/10.1039/c6dt04160d.
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Rota Martir, Diego, Mattia Averardi, Daniel Escudero, Denis Jacquemin, and Eli Zysman-Colman. "Photoinduced electron transfer in supramolecular ruthenium–porphyrin assemblies." Dalton Transactions 46, no. 7 (2017): 2255–62. http://dx.doi.org/10.1039/c6dt04414j.
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We present dynamic supramolecular systems composed of a Ru(ii) complex of the form of [Ru(dtBubpy)2(qpy)][PF6]2 (where dtBubpy is 4,4′-di-tert-butyl-2,2′-dipyridyl and qpy is 4,4′:2′,2′′:4′′,4′′′-quaterpyridine) and zinc tetraphenylporphyrins (ZnTPP), through non-covalent interactions between the distal pyridines of the qpy and the zinc of ZnTPP.
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Glodjovic, Verica, and Srecko Trifunovic. "Stereospecific ligands and their complexes: Synthesis and characterization of the s-cis-K[Ru(S,S-eddp)Cl2]·3H2O." Journal of the Serbian Chemical Society 73, no. 5 (2008): 541–45. http://dx.doi.org/10.2298/jsc0805541g.
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In the reaction of ruthenium(III) chloride and an edda-like ligand ethylenediamine-N,N'-di-S,S-2-propionic acid (S,S-eddp) in aqueous solution led to the formation of only one of the three possible geometrical isomers potassium- s-cis-dichlorido-(ethylenediamine-N,N'-di-S,S-2-propionato)-ruthenate(III)- -trihydrate, s-cis-K[Ru(S,S-eddp)Cl2]?3H2O. The assumed geometry of the complex was based on its electronic absorption and infrared spectra.
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Li, Xianghong, Kun Hou, Xinfang Duan, Fuyou Li, and Chunhui Huang. "Ruthenium(II) complex based on 4,4′-di(p-methylphenyl)-2,2′-bipyridine: Synthesis and photoelectrochemical properties." Inorganic Chemistry Communications 9, no. 4 (April 2006): 394–96. http://dx.doi.org/10.1016/j.inoche.2006.01.012.
Full textDissertations / Theses on the topic "Chemistry - complex di ruthenium"
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Wohnrath, Karen [UNESP]. "Aplicação do '[RuCl IND. 3(DPPB)H IND.2 O] na obtenção do complexos mono e binucleares." Universidade Estadual Paulista (UNESP), 1999. http://hdl.handle.net/11449/105809.
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wohnrath_k_dr_araiq.pdf: 2129110 bytes, checksum: 7f32f1de19507766ae5c9a4b7787daba (MD5)O complexo inédito mer-[RuCl3(dppb)H2O], foi caracterizado como precursor de uma série de compostos fosfínicos. Foram testadas sínteses do complexo título com ligantes providos de diferentes modos de coordenação, tais como os monodentados (L= DMSO, MeOH, NO e CO, py, 4-Mepy), exodentado (L= 4-CNpy), bidentados (L-L= 2,2'-bipy, fen) e ambidentado (L-L= 4,4'-bipy). Os produtos destas reações foram isolados como espécies bifosfínicas de rutênio (III) de fórmula geral mer-[RuCl3(dppb)(L)], cis-[RuCl2(dppb)(L-L)]+ e [Ru2Cl6(dppb)2(μ-4,4'-bipy)]. Reações do mer-[RuCl3(dppb)H2O] e fosfinas mono, bi e tridentadas, foram investigadas e a partir destas, obteve-se a série de complexos mono, bi e trifosfínicos de rutênio (II), conhecidos na literatura como reagentes para sínteses de compostos de rutênio, tais como [RuCl2(dppb)(PPh3)], [RuCl2(P-P)2] (P-P= dppm, dppe e dppp) e [Ru2Cl4(P-P)3] (PP= dppb), e [Ru2Cl3(P-P-P)2]Cl (P-P-P= tdpme e etp). A partir dos complexos do tipo [Ru2Cl3(P-P-P)2]Cl, obteve-se compostos do tipo [RuCl(P-P-P)(N-heterocíclico)]Cl, dando continuidade à nova série de complexos mononucleares solvato, [RuCl(P-P-P)(solvente)]Cl. Os compostos de Ru(II) e Ru(III) obtidos, foram caracterizados através de espectroscopia de absorção na região do infravermelho, ultravioleta-visível, RPE, RMN 31P, medidas de condutância molar, medidas de susceptibilidade magnética, análise elementar, voltametria cíclica e em alguns casos, difração de raios-X. O comportamento eletroquímico dos complexos bifosfínicos de Ru(III) mer- [RuCl3(dppb)H2O] e mer-[RuCl3(dppb)(L)], apresentou perfil bastante peculiar. A partir da metodologia empregada na obtenção por via eletroquímica, atribuiu-se as espécies Ru2II/III, [Ru2Cl5(dppb)2], de Ru(II), [Ru2Cl4(dppb)2], [RuCl2(dppb)(L)2] e [Ru2Cl4(dppb)2(L)], como produtos formados na superfície do eletrodo,...
The new complex mer-[RuCl3(dppb)H2O] was characterized as precursor of a series of ruthenium (III) mono and biphosphines complexes. Syntheses of the complex title were tested with ligands provided from different coordination manners, such as the monodentates ligands (L = DMSO, MeOH, NO, CO, py, 4-Mepy), exobidentate ligand (L = 4-CNpy), chelate ligands (L-L = 2,2'-bipy, fen) and umbidentate ligand (L-L = 4,4'-bipy). The reaction products were isolated as ruthenium (III) phosphines complexes of general formula mer-[RuCl3(dppb)(L)], cis-[RuCl2(dppb)(L-L)]+, and [Ru2Cl6(dppb)2(μ-4,4'-bipy)], respectively. Reactions of the mer-[RuCl3(dppb)H2O] with monophosphines, diphosphines and triphosphines were investigated and starting from these, it was obtained the series of complex mono, di and triphosphines ruthenium (II), wich are known in the literature as starting material for syntheses of compounds of ruthenium, such as [RuCl2(dppb)(PPh3)], [RuCl2(P-P)2] (P-P = dppm, dppe and dppp) and [Ru2Cl4(P-P)3] (P-P = dppb), and [Ru2Cl3(PP- P)2]Cl (P-P-P = tdpme and etp). Mononuclear ruthenium complexes of the type [RuCl(P-PP)( N-heterocylic)]Cl, were isolated from the reaction of the binuclear [Ru2Cl3(P-P-P)2]Cl (PP- P = tdpme and etp) with excess of ligand. Standard spectroscopic methods, particularly IR, UV-Vis, EPR, 31P{1H} MNR, were extensively used to characterize (sometimes in conjunction with X-ray crystallography) all of the species discussed in this thesis. The complexes were also characterized by molar conductance, magnetic moment measurement, elementary analysis and cyclic voltammetry. The electrochemical behaviour of the biphosphine complexes Ru(III) presented quite peculiar profiles. Starting from the methodology using electrochemistry route, it was attributed the species of Ru2II/III, [Ru2Cl5(dppb)2], and of Ru(II), [Ru2Cl4(dppb)2], [RuCl2(dppb)(L)2] and [Ru2Cl4(dppb)2(L)], ...(Complete abstract, click electronic access below)
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Wohnrath, Karen. "Aplicação do '[RuCl IND. 3(DPPB)H IND.2 O] na obtenção do complexos mono e binucleares /." Araraquara : [s.n.], 1999. http://hdl.handle.net/11449/105809.
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Orientador: Alzir Azevedo BatistaBanca: Luiz Antônio Andrade de Oliveira
Banca: Regina Frem
Banca: Wagner Ferraresi de Giovani
Banca: Benedito Lima Neto
Resumo: O complexo inédito mer-[RuCl3(dppb)H2O], foi caracterizado como precursor de uma série de compostos fosfínicos. Foram testadas sínteses do complexo título com ligantes providos de diferentes modos de coordenação, tais como os monodentados (L= DMSO, MeOH, NO e CO, py, 4-Mepy), exodentado (L= 4-CNpy), bidentados (L-L= 2,2'-bipy, fen) e ambidentado (L-L= 4,4'-bipy). Os produtos destas reações foram isolados como espécies bifosfínicas de rutênio (III) de fórmula geral mer-[RuCl3(dppb)(L)], cis-[RuCl2(dppb)(L-L)]+ e [Ru2Cl6(dppb)2(μ-4,4'-bipy)]. Reações do mer-[RuCl3(dppb)H2O] e fosfinas mono, bi e tridentadas, foram investigadas e a partir destas, obteve-se a série de complexos mono, bi e trifosfínicos de rutênio (II), conhecidos na literatura como reagentes para sínteses de compostos de rutênio, tais como [RuCl2(dppb)(PPh3)], [RuCl2(P-P)2] (P-P= dppm, dppe e dppp) e [Ru2Cl4(P-P)3] (PP= dppb), e [Ru2Cl3(P-P-P)2]Cl (P-P-P= tdpme e etp). A partir dos complexos do tipo [Ru2Cl3(P-P-P)2]Cl, obteve-se compostos do tipo [RuCl(P-P-P)(N-heterocíclico)]Cl, dando continuidade à nova série de complexos mononucleares solvato, [RuCl(P-P-P)(solvente)]Cl. Os compostos de Ru(II) e Ru(III) obtidos, foram caracterizados através de espectroscopia de absorção na região do infravermelho, ultravioleta-visível, RPE, RMN 31P, medidas de condutância molar, medidas de susceptibilidade magnética, análise elementar, voltametria cíclica e em alguns casos, difração de raios-X. O comportamento eletroquímico dos complexos bifosfínicos de Ru(III) mer- [RuCl3(dppb)H2O] e mer-[RuCl3(dppb)(L)], apresentou perfil bastante peculiar. A partir da metodologia empregada na obtenção por via eletroquímica, atribuiu-se as espécies Ru2II/III, [Ru2Cl5(dppb)2], de Ru(II), [Ru2Cl4(dppb)2], [RuCl2(dppb)(L)2] e [Ru2Cl4(dppb)2(L)], como produtos formados na superfície do eletrodo,...(Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The new complex mer-[RuCl3(dppb)H2O] was characterized as precursor of a series of ruthenium (III) mono and biphosphines complexes. Syntheses of the complex title were tested with ligands provided from different coordination manners, such as the monodentates ligands (L = DMSO, MeOH, NO, CO, py, 4-Mepy), exobidentate ligand (L = 4-CNpy), chelate ligands (L-L = 2,2'-bipy, fen) and umbidentate ligand (L-L = 4,4'-bipy). The reaction products were isolated as ruthenium (III) phosphines complexes of general formula mer-[RuCl3(dppb)(L)], cis-[RuCl2(dppb)(L-L)]+, and [Ru2Cl6(dppb)2(μ-4,4'-bipy)], respectively. Reactions of the mer-[RuCl3(dppb)H2O] with monophosphines, diphosphines and triphosphines were investigated and starting from these, it was obtained the series of complex mono, di and triphosphines ruthenium (II), wich are known in the literature as starting material for syntheses of compounds of ruthenium, such as [RuCl2(dppb)(PPh3)], [RuCl2(P-P)2] (P-P = dppm, dppe and dppp) and [Ru2Cl4(P-P)3] (P-P = dppb), and [Ru2Cl3(PP- P)2]Cl (P-P-P = tdpme and etp). Mononuclear ruthenium complexes of the type [RuCl(P-PP)( N-heterocylic)]Cl, were isolated from the reaction of the binuclear [Ru2Cl3(P-P-P)2]Cl (PP- P = tdpme and etp) with excess of ligand. Standard spectroscopic methods, particularly IR, UV-Vis, EPR, 31P{1H} MNR, were extensively used to characterize (sometimes in conjunction with X-ray crystallography) all of the species discussed in this thesis. The complexes were also characterized by molar conductance, magnetic moment measurement, elementary analysis and cyclic voltammetry. The electrochemical behaviour of the biphosphine complexes Ru(III) presented quite peculiar profiles. Starting from the methodology using electrochemistry route, it was attributed the species of Ru2II/III, [Ru2Cl5(dppb)2], and of Ru(II), [Ru2Cl4(dppb)2], [RuCl2(dppb)(L)2] and [Ru2Cl4(dppb)2(L)], ...(Complete abstract, click electronic access below)
Doutor
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Allan, Christian Bruce. "Macrocyclic chemistry: Part I. Synthesis, characterization and alkali metal stability constants of a new bis(phosphotriester) macrobicyclic polyether cryptand; Part II. Characterization of a new valence-averaged mixed-valence di-ruthenium complex, and of an iron beta-diimine keto macrocyclic complex." Scholarly Commons, 1994. https://scholarlycommons.pacific.edu/uop_etds/2667.
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The study of macrocyclic ligands for complexation of alkali metals (macrobicyclic polyether cryptands) and transition metals (tetraaza macrocycles) is reported. The synthesis of a new bis(phosphotriester) macrobicyclic polyether cryptand, O = P (O(CH$\sb2)\sb2\rm O(CH\sb2)\sb2O(CH\sb2)\sb2O\rbrack\sb3$ P = O, 1, called phosphocrypt, and its acyclic tripodal precursor O = P (O(CH$\sb2)\sb2\rm O(CH\sb2)\sb2O(CH\sb2)\sb2OH\rbrack\sb3$, 2, is described. Aqueous stability constants (K$\sb{\rm s}$) measured with a cation selective electrode with potassium and rubidium are 10$\sp{3.7}$ and 10$\sp{3.6}$ for 1, and are 10$\sp{3.6}$ and 10$\sp{3.0}$ for 2, respectively. The K$\sb{\rm s}$ values for phosphocrypt are 1000 fold greater than comparably sized nitrogen bridgehead cryptands. $\sp1$H and $\sp{13}$C NMR indicate 1 is flexible at 20$\sp\circ$C. Molecular mechanics calculations confirm the flexibility of 1. Also reported are the synthesis and characterization of (1) a new mixed-valence bimetallic ruthenium complex, Ru$\sb2\rm (C\sb{20}H\sb{36}N\sb8)Cl\sb{4}\sp{+}$, 3, that contains a cross-conjugated bridge that links two tetraaza macrocycles; and (2) the formation, physical properties, and reduction chemistry of a new iron $\beta$-diimine keto macrocyclic complex, Fe(C$\rm \sb{10}H\sb{18}N\sb{4}O)(CH\sb3CN)\sb{2}\sp{2+},$ 4. The ruthenium dimer 3 was formed by oxidative dehydrogenation of Ru(C$\rm\sb{10}H\sb{24}N\sb4)(Cl\sb2)\sp+$ and its mass was determined by positive ion fast atom bombardment mass spectrometry. The binuclear species 3 is assigned as a Robin and Day strongly coupled class III mixed-valence species based on cyclic voltammetry, electronic spectroscopy, and X-ray photoelectron spectroscopy (XPS). The XPS photopeaks of 3 for the binding energies from the Ru 3p$\sb{1/2}$ and Ru 3p$\sb{3/2}$ regions show only a single peak, indicating the unpaired electron is delocalized on the short (10$\sp{-17}$ s) timescale of the XPS experiment. The keto complex 4 was formed in high yields ($>$90%) from the reaction of Fe$\rm\sb2(C\sb{20}H\sb{36}N\sb8)(CH\sb3CN)\sb{4}\sp{4+}$, 5, (the diiron analog of 3) with molecular oxygen. Its mass was determined by electrospray mass spectrometry and its structure by NMR spectroscopy ($\sp1$H, $\sp{13}$C, COSY, NOE DIFF). The complex is rigid at room temperature in CD$\sb3$CN and this allows the assignment of the ten distinct protons. Reduction of the keto group in 4 under anaerobic conditions, followed by aerobic oxidation, leads to the reformation of 5.
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Ketcham, Ryan R. "DEVELOPMENT OF NOVEL ELECTROPHILIC RUTHENIUM(II) AND IRIDIUM(III) COMPLEXES AND THEIR APPLICATIONS AS HOMOGENEOUS CATALYSTS." UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_theses/100.
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Our aim was to develop the synthetic potential and reaction chemistry of Ir3+ and Ru2+ electrophiles by preparing well-characterized complexes whose properties are controllable by modification of the ancillary ligand environment Specifically, we prepared a series of ruthenium complexes to serve as selective hydrogenation and hydrogenolysis catalysts of furan derivatives. We also expanded the synthesis of electrophilic Ir3+ di-thiolate complexes. These types of compounds could eventually serve as catalysts precursors for the addition of weak nucleophiles to alkynes and nitriles.
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Kuncheria, Joshi. "Chemistry of a binuclear ruthenium(0) complex." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq28503.pdf.
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Moritz, Paul Stuart. "Substitution and redox chemistry of ruthenium complexes /." Title page, contents and summary only, 1987. http://web4.library.adelaide.edu.au/theses/09PH/09phm862.pdf.
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Bair, Nathan A. "Synthesis and Characterization of an Oligothiophene-Ruthenium Complex and Synthesis and Optical Properties of Oligothiophene-Ruthenium Complexes Bound to CdSe Nanoparticles." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2596.
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Oligothiophenes are of increasing interest in organic based electronic devices in part due to their high electron and hole mobilities. In an organic photovoltaic (OPV) device, the electronic properties of oligothiophenes make them advantageous as charge transfer junctions. To serve as charge transfer junctions, oligothiophenes must be functionalized to bind to the donor and acceptor parts of the device. The donor and acceptor parts are different materials and the synthesis of asymmetric oligothiophenes is of great interest. Previous researchers in our lab synthesized four asymmetric oligothiophenes, two with two thiophene subunits and two with four. Each set of oligothiophenes contained a pair of constitutional isomers. Here we report the synthesis of another asymmetric oligothiophene, one with three thiophene subunits. This compound is functionalized with bipyridine to bind Ru(bpy)22+ and with phosphonic acid moieties to bind CdSe nanoparticles. The synthesis was carried out by bonding a phosphonic acid moiety to bithiophene and bipyridine to thiophene and then coupling the phosphate-bithiophene and thiophene-bipyridine. Standard Stille couplings were used for carbon-carbon bond formation. The resulting compounds have complex NMR spectra and overlapping Ru MLCT and π-π* transitions at 450 nm with molar extinction coefficient on the order of 3 x 105 M-1 cm-1. The thiophene fluorescence is quenched by Ru(bpy)22+. These optical properties compare closely with the previous compounds synthesized. Solar cells occupy significant attention in the media, politics and science for their promise of continual pollution-free energy. Quantum dots, metal complexes and organic compounds are all under research as viable replacements for expensive silicon solar cells. To test the efficacy of a light harvesting compound before constructing a solar cell, a model system is constructed to show electron transfer from the light harvester into an electron acceptor. We synthesized oligothiophenes and oligothiophene-ruthenium complexes and tested their ability to act as sensitizers and charge transfer junctions. To do this, they were bonded to CdSe nanoparticles and their optical properties were measured. Steady-state photoluminescence and time correlated single photon counting were used to observe the effects on fluorescence and fluorescence lifetime of the CdSe-oligothiophene and CdSe-oligothiophene-ruthenium complexes before and after binding. It was found that CdSe fluorescence was quenched when bound to an oligothiophene ruthenium complex, and that the fluorescence of the oligothiophene was quenched when bound to CdSe in the absence of ruthenium. The fluorescence lifetimes of the quenched species were shortened.
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Viljoen, Karen. "Ruthenium(III) aqua-chloro complex chemistry : the interconversion of the hexachlororuthenate(III) and aquapentachlororuthenate(III) species." Thesis, Stellenbosch : University of Stellenbosch, 2003. http://hdl.handle.net/10019.1/16458.
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Thesis (MSc)--University of Stellenbosch, 2003.ENGLISH ABSTRACT: Ruthenium, as one of the platinum group metals, was investigated to determine the aquation rate constant of [RuCl6]3- and the anation rate constant of [RuCl5(H2O)]2-. This two reactions represent the equilibrium reaction [RuCl6]3- + H2O ⇄ [RuCl5(H2O)]2- + Cl-. The reactions were followed, using stopped-flow injection and UV/Visible spectroscopy, at different temperatures. The aquation and anation rate constants were determined with good precision and thermodynamic values for the reactions were calculated. The pseudo first order aquation rate constant, k65, was determined by calculation from the regression line as k65 = 52.1 (±3.7) x10-3 s-1 at 25°C. The activation energy, Ea, is 90.1 (±1.2) kJ.mol-1 and the enthalpy and entropy of activation is 87.7 (±1.2) kJ.mol-1 and 24.7 (±4.3) J.K-1.mol-1, respectively. The aquation rate constant was found to be dependent on the hydrochloric acid concentration, decreasing with increasing hydrochloric acid concentration. From the regression line at 25°C the second order anation rate constant, k56, was calculated as 1.62 (±0.11) x10-3 M-1s-1. The activation energy is 88.0 (±1.4) kJ.mol-1, with the enthalpy and entropy of activation 85.6 (±1.4) kJ.mol-1 and –11.2 (±4.7) J.K-1.mol-1, respectively. The influence of the hydrochloric acid concentration of the solution on the anation rate constant was not investigated. The equilibrium constant for the reaction studied was calculated from the rate constants for the aquation and anation reactions. The equilibrium constant, K6, was calculated as 0.0311 M-1 at 25°C. The equilibrium constant, when compared to literature, was found to be dependent on the hydrochloric acid concentration. It was then used, in conjunction with data from the literature, to construct two distribution diagrams. Distribution diagrams for the Ru(III) aquachloro species show between 79.9% to 72.3% [RuCl6]3- present in 12M HCl. The two distribution diagrams were very similar and it is not possible to resolve the issue of a final distribution diagram for the aqua-chloro Ru(III) system without further investigation into the all the other rate constants of the Ru(III) aqua-chloro species. The rate constants and thermodynamic values for the Ru(III) reaction were compared to corresponding data (from literature) for Rh(III) and Ir(III) because several comparisons between these platinum group metals have been noted. It was found that for both the aquation and anation rate constants, the following trend was observed: Ru(III) > Rh(III) > Ir(III). These differences are in certain cases exploited in the refining of these platinum group metals. Crystals of diethylenetriamine hexachlororuthenate(III) was prepared and characterised by x-ray crystallography and CHN analysis. The average Cl-Ru bond length for the crystal was 2.371 Å. The crystal structure was compared to hexaaquaaluminium hexachlororuthenate(III) tetrahydrate and diethylenetriamine hexachlororhodate(III). The metal-chloride bond lengths of all the crystals were found to be similar (2.350 Å – 2.375 Å). The diethylenetriamine crystal structures compared well. The conclusion was that the crystals prepared were diethylenetriamine hexachlororuthenate(III).
AFRIKAANSE OPSOMMING: Ruthenium(III), een van die platinum groep metaal-ione, is in hierdie studie ondersoek om die akwasie tempo konstante van [RuCl6]3- en die anasie tempo konstante van [RuCl5(H2O)]2- te bepaal. Dié twee reaksies verteenwoordig die ewewigsreaksie [RuCl6]3- + H2O ⇄ [RuCl5(H2O)]2- + Cl-. Die verloop van die reaksies is met behulp van UV/Sigbare spektroskopie by verskillende temperature gevolg. Die akwasie en anasie tempo konstantes is bepaal met goeie presisie en die termodinamiese konstantes van die reaksies is bereken. Die pseudo-eerste orde akwasie tempo konstante, k65, is bepaal deur middel van regressie, as 52.1 (±3.7) x10-3 s-1 by 25°C. Die aktiverings energie, Ea, is bereken as 90.1 (±1.2) kJ.mol-1 en die entalpie en entropie van aktivering is onderskeidelik 87.7 (±1.2) kJ.mol-1 en 24.7 (±4.3) J.K-1.mol-1. Daar is gevind dat die akwasie reaksie konstante afhanklik was van die soutsuur konsentrasie: dit neem af soos die soutsuur konsentrasie toeneem. Met behulp van die regressie lyn is die anasie tempo konstante bepaal by 25°C as 1.62 (±0.11) x10-3 M-1s-1. Die aktiveringsenergie is bepaal as 88.0 (±1.4) kJ.mol-1 en die entalpie en entropie van aktivering, onderskeidelik as 85.6 (±1.4) kJ.mol-1 en –11.2 (±4.7) J.K-1.mol-1. Die invloed van die soutsuur konsentrasie op die anasie tempo konstante is nie bepaal nie. Die ewewigskonstante vir die reaksie wat ondersoek is, is bereken met die tempo konstantes vir die akwasie en anasie reaksies. Die ewewigskonstante, K6, is bereken as 0.0311 M-1 by 25°C. Toe die ewewigskonstante vergelyk is met die literatuur waardes, is gevind dat die ewewigskonstante afhanklik is van die soutsuur konsentrasie. Saam met die waardes wat in die literatuur gevind is, is die ewewigskonstante gebruik om twee distribusie diagramme te bereken. Die distribusie diagramme vir die Ru(III) spesies toon onderskeidelik 79.9% en 72.3% [RuCl6]3- in 12M HCl. Die twee distribusie diagramme is baie eenders en dit is nie moontlik om ‘n finale distribusie diagram op te trek totdat die uitstaande tempo konstantes tussen die akwachloro Ru(III) spesies bepaal word nie. Die tempo konstantes en termodinamiese waardes wat bepaal is vir die Ru(III) reaksie is vergelyk met gelyksoortige waardes in die literatuur van Rh(III) en Ir(III) omdat daar ooreenkomste tussen die platinum groep metale opgemerk is. Daar is bevind dat die akwasie én anasie reaksies die volgende patroon volg: Ru(III) > Rh(III) > Ir(III). Die verskille word in sekere gevalle benut in die raffinering van hierdie metale. Kristalle van dietileentriamien heksachlororuthenaat(III) is berei en gekarakteriseer met behulp van CHN analise en x-straal kristallografie. Die gemiddelde Cl-Ru bindingsafstand vir die kristal was 2.371 Å. Die kristalstruktuur is vergelyk met dié van heksaäkwaäluminium hexachlororuthenaat(III) tetrahidraat en diëtileentriamien heksachlororhodaat(III). Die chloried-metaal bindingsafstand vir die kristalle was soortgelyk (2.350 Å – 2.375 Å). Die diëtileentriamien kristalstrukture stem goed ooreen. Die gevolgtrekking was dat die kristalle wat voorberei is wel diëtileentriamien heksachlororuthenaat(III) was.
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Jin, Yuhuan. "Photomechanical Effects in Ruthenium Sulfoxide Complexes." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1372808823.
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Wilson, Dale F. "Synthesis, Characterization, DNA Binding and Photocleavage Studies of a Di-Ruthenated Porphyrin." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1398882510.
Full textBook chapters on the topic "Chemistry - complex di ruthenium"
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"Energy of a Homolytic Cleavage of Communication OH in Replaced 2,6-di-tert.Butylphenols." In Chemistry and Physics of Complex Materials, 225–34. Apple Academic Press, 2013. http://dx.doi.org/10.1201/b16302-13.
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Bandar, Jeffrey S. "Reductions." In Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0010.
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Manfred T. Reetz at the Max-Planck-Institut Mülheim and Philipps-Universität Marburg developed (J. Am. Chem. Soc. 2013, 135, 1665) a mutated Thermoethanolicus brockii alcohol dehydrogenase for the enantioselective reduction of 4-alkylidene cyclohexanone 1. Using a new C₂-symmetic chiral bisphosphine ligand (Wingphos, 5), Wenjun Tang at the Shanghai Institute of Organic Chemistry reported (Angew. Chem. Int. Ed. 2013, 52, 4235) the rhodium-catalyzed asymmetric hydrogenation of β-aryl enamide 3. Qi-Lin Zhou of Nankai University utilized chiral spirophosphine oxazoline iridium complexes 8a and 8b for the asymmetric hydrogenation of unsaturated piperidine carboxylic acid 6 (Angew. Chem. Int. Ed. 2013, 52, 6072) and 1,1-diarylethylene 9 (Angew. Chem. Int. Ed. 2013, 52, 1556) with excellent selectivities. The iron- catalyzed chemoselective hydrogenation of α,β-unsaturated aldehyde 11 was demonstrated (Angew. Chem. Int. Ed. 2013, 52, 5120) by Matthias Beller at the University of Rostock. Jeffrey S. Johnson at the University of North Carolina at Chapel Hill showed (J. Am. Chem. Soc. 2013, 135, 594) that asymmetric transfer hydrogenation of racemic acyl phosphonate 14 yielded β-stereogenic α- hydroxy phosphonate 16, a reversal in diastereoselectivity observed in the case of α-keto ester analogues. Gojko Lalic of the University of Washington developed (Org. Lett. 2013, 15, 1112) a monophasic copper catalyst system for the selective semireduction of terminal alkyne 17. Alois Fürstner and coworkers at Max-Planck-Institut Mülheim reported (Angew. Chem. Int. Ed. 2013, 52, 355) the ruthenium-catalyzed trans- selective hydrogenation of alkyne 19. Macrocyclic alkynes could also be selectively hydrogenated to E- alkenes using this methodology. Bernhard Breit at the University of Freiburg found (Angew. Chem. Int. Ed. 2013, 52, 2231) that a bimetallic Pd/ Re/ graphite catalyst system was highly active for the hydrogenation of tertiary amide 21 to amine 22. Professor Beller also discovered (Chem. Eur. J. 2013, 19, 4437) that a commercially available ruthenium complex allowed for the effective transfer hydrogenation of aromatic nitrile 23 to benzyl amine 24. Notably, no reductive amination side products were observed. Maurice Brookhart at the University of North Carolina at Chapel Hill used (Org. Lett. 2013, 15, 496) tris(pentafluorophenyl)borane as a highly active catalyst for the selective reduction of carboxylic acid 25 to aldehyde 26 with triethylsilane as a hydride source.
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Lambert, Tristan H. "New Methods for C–N Ring Construction." In Organic Synthesis. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780190200794.003.0055.
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The reduction of pyridines offers an attractive approach to piperidine synthesis, and now Toshimichi Ohmura and Michinori Suginome of Kyoto University have developed (J. Am. Chem. Soc. 2012, 134, 3699) a rhodium-catalyzed hydroboration of pyridines, including the reaction of 1 to produce 3. Timothy J. Donohoe at the University of Oxford has found (Org. Lett. 2011, 13, 2074) that pyridinium silanes 4 undergo intramolecular hydride transfer by treatment with TBAF to produce dihydropyridones (e.g., 5) with good diastereoselectivity. Enantioselective amination of allylic alcohols has proven challenging, but Ross A. Widenhoefer at Duke University has reported (Angew. Chem. Int. Ed. 2012, 51, 1405) that a chiral gold catalyst can effect such intramolecular cyclizations with good enantioselectivity, as in the synthesis of 7 from 6. Alternatively, Masato Kitamura at Nagoya University has developed (Org. Lett. 2012, 14, 608) a ruthenium catalyst that operates at as low as 0.05 mol% loading for the conversion of substrates such as 8 to 9. Efforts to replace transition metal catalysts with alkaline earth metal-based alternatives have been gaining increasing attention, and Kai C. Hultzsch at Rutgers University has found (Angew. Chem. Int. Ed. 2012, 51, 394) that the magnesium complex 12 is capable of catalyzing intramolecular hydroamination (e.g., 10 to 11) with high enantioselectivity. Meanwhile, a stereoselective Wacker-type oxidation of tert-butanesulfinamides such as 13 to produce pyrrolidine derivatives 14 has been disclosed (Org. Lett. 2012, 14, 1242) by Shannon S. Stahl at the University of Wisconsin at Madison. Though highly desirable, Heck reactions have rarely proven feasible with alkyl halides due to competitive β-hydride elimination of the alkyl palladium intermediates. Sherry R. Chemler at the State University of New York at Buffalo has demonstrated (J. Am. Chem. Soc. 2012, 134, 2020) a copper-catalyzed enantioselective amination Heck-type cascade (e.g., 15 and 16 to 17) that is thought to proceed via radical intermediates. David L. Van Vranken at the University of California at Irvine has reported (Org. Lett. 2012, 14, 3233) the carbenylative amination of N-tosylhydrazones, which proceeds through η3-allyl Pd intermediates constructed via carbene insertion. This chemistry was applied to the two-step synthesis of caulophyllumine B from vinyl iodide 18 and N-tosylhydrazone 19.
Conference papers on the topic "Chemistry - complex di ruthenium"
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GHANEM, RAED, JIE PAN, YUNHUA XU, JOHAN ANDERSSON, TOMÁŠ POLÍVKA, LICHENG SUN, and VILLY SUNDSTRÖM. "LIGHT DRIVEN MULTISTEP ELECTRON TRANSFER IN A TYROSINE-RUTHENIUM-COMPLEX ANCHORED TO TIO2 NANOPARTICLES." In With Foreword by Prof A H Zewail, Nobel Laureate in Chemistry, 1999. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777980_0067.
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Steiner, R., C. Bauer, C. Krüger, F. Otto, and U. Maas. "3D-Simulation of DI-Diesel Combustion Applying a Progress Variable Approach Accounting for Complex Chemistry." In SAE 2004 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2004. http://dx.doi.org/10.4271/2004-01-0106.
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Tao, Feng, and Jerzy Chomiak. "Numerical Investigation of Reaction Zone Structure and Flame Liftoff of DI Diesel Sprays with Complex Chemistry." In SAE 2002 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2002. http://dx.doi.org/10.4271/2002-01-1114.
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PARFENOVA, M. C., V. E. AGABEKOV, A. A. CHERNYAVSKAYA, N. V. LOGINOVA, and G. I. POLOZOV. "FORMATION OF SILVER NANOPARTICLES FROM A (2,3-DYHYDROXY-4,6-DI-TERT-BUTYLPHENYLTHIO-)ACETIC ACID SILVER COMPLEX." In Physics, Chemistry and Application of Nanostructures - Reviews and Short Notes to Nanomeeting 2003. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812796738_0089.
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Barbero, Silvia. "Opportunities and challenges in teaching Systemic Design. The evoluation of the Open Systems master courses at Politecnico di Torino." In Systems & Design: Beyond Processes and Thinking. Valencia: Universitat Politècnica València, 2016. http://dx.doi.org/10.4995/ifdp.2016.3353.
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The contamination between design and theory of systems as a field of development of new design processes is nowadays consolidated. However, the issue concerning the methodology to apply in teaching systemic design remains an open question. The approach adopted in the Master Degree in Systemic Design at Politecnico di Torino is based on the assumption that the teaching method must itself be systemic. Alongside designers, the degree course has involved from the very beginning experts of different disciplines (i.e. chemistry, physics, mechanics, history, economy and management) as teachers, in order to create a multidisciplinary environment for the development of projects. Born as master degree in academic year 2002-03 at Politecnico di Torino (Italy) from the close collaboration with Gunter Pauli, the course has changed name and form but not the content, until it reached the current title (a.y. 2015-16): master degree “Aurelio Peccei” in Systemic Design. The Open Systems course has enabled students, in previous years, to experiment the design of production processes. This was the case of the systemic project done with NN Europe, a company engaged in manufacturing ball bearings, in which the output management allows a positive economic impact. Over the years the course has shifted its focus from the production process of a product to the wider company context. In 2010, the approach has been applied to the agricultural enterprise Ortofruit: starting from agricultural production, the students have defined the production system and the relationships with the market. Systemic Design, during this course, has experienced the transition from the design of industrial processes that are closely linked to the territory, and then enhance local resources, to the design of the whole territorial system. The work done by the students of the course in recent years has led to the definition of scenarios about fields usually distant from the traditional design world. For example, the definition of the economic model, the corporate model that is built around relationships on cooperation with different disciplines.This transition, from the product to the entire territorial system, allows the exploration of new contexts, but it also puts the designer in a complex and challenging position in according with complex theories.DOI: http://dx.doi.org/10.4995/IFDP.2016.3353
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Diaby, Moussa, Michel Sablier, Anthony Le Negrate, and Mehdi El Fassi. "Kinetic Study of the Thermo-Oxidative Degradation of Squalane (C30H62) Modelling the Base Oil of Engine Lubricants." In ASME 2009 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/ices2009-76033.
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On the basis of ongoing research conducted on the clarification of processes responsible for lubricant degradation in the environment of piston grooves in EGR diesel engines, an experimental investigation was aimed to develop a kinetic model which can be used for the prediction of lubricant oxidative degradation correlated to endurance test conducted on engines. Knowing that base oils are a complex blend of paraffins and naphtenes with a wide range of sizes and structures, their chemistry analysis during the oxidation process can be highly convoluted. In the present work, investigations were carried out with the squalane (C30H62) chosen for its physical and chemical similarities with the lubricant base oils used during the investigations. Thermo-oxidative degradation of this hydrocarbon was conducted at atmospheric pressure in a tubular furnace, while varying temperature and duration of the tests in order to establish an oxidation reaction rate law. The same experimental procedures was applied to squalane doped with two different phenolic antioxidants usually present in engine oil composition: 2,6-di-tert-butyl-4-methylphenol (BHT), and octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (OBHP). Thus, the effect of both antioxidants on the oxidation rate law was investigated. Data analysis of the oxidized samples (FTIR spectroscopy, gas chromatography/mass spectrometry GC/MS) allowed to rationalize the thermo-oxidative degradation of squalane. The resulting kinetic modelling provides a practical analytical tool to follow the thermal degradation processes, which can be used for prediction of base oil hydrocarbon ageing. If experiments confirmed the role of phenolic additives as an affective agent to lower oxidation rates, the main results lay in the observation of a threshold temperature where a reversed activity of these additives was observed.