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Abstract

Structurally different chiral ruthenium complexes were used in the asymmetric hydrogenation of methyl acetoacetate to methyl (R)-3-hydroxybutanoate. The naphthalene and dioxazole biphosphine structure variations revealed a strong effect on the reaction rate and the parameter of enantioselectivity. The highest optical yields were achieved with catalysts bearing two metal centers and comprising the quaternary ammonium ionic character.

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Journal of Thermal Analysis and Calorimetry
Authors: Valentina Uivarosi, Mihaela Badea, Rodica Olar, Dana Marinescu, Teodor Octavian Nicolescu, and George Mihai Nitulescu

of transindazoliumtetrachlorobis(indazole)ruthenate(III), a new anticancer ruthenium complex. IR, UV, NMR, HPLC investigations and antitumor activity. Crystal structures of trans-l-methylindazoliumtetrachlorobis-(1-methylindazole)ruthenate(III) and

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and long-term stability. It is known in the literature [ 2 ] that, such great photovoltaic performance was achieved by using polypyridyl complexes of ruthenium and osmium. Several ruthenium complexes containing anchoring groups such as carboxylic acid

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Abstract  

In this work, hydrogenation of sorbic acid to cis-hex-3-enoic acid using homogeneous Ru catalyst [Cp*Ru(sorbic acid)]Tf (Tf = CF3SO3 ) immobilized to smectite materials by means of ion exchange has been studied. The immobilized catalyst was utilized for heterogeneous hydrogenation of sorbic acid to the desired cis-hex-3-enoic acid, achieving the selectivity of up to 95% and the possibility of the catalyst to be reused.

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chlorine atoms (Cl(1)-Ru-Cl(2)-180°). The bond lengths of Ru–Cl and Ru–N were 2.408 and 2.082 Å in the complex. The Ru–Cl distance was comparable with the distance in other ruthenium complexes containing nitrogen heterocyclic ligands [ 25 , 26 ]. The bond

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Abstract  

In contrast to the single molecule cage of Ru/acac/3 a cage involving wall molecules of RuCp2 is formed in recoil reaction of radioruthenium atoms. Enhancement of the parent yield in RuCp2 is ascribed to the larger size of the cage /effective hot reaction zone/ compared to the case of Ru/acac/3. A normalized appearance energy technique has been applied to estimate energy /AE adj x / necessary for caging the recoil atom in RuCp2. AE adj x is about twice as large as caging energy CE. The relation of AE adj x to CE in RuCp2 is nearly the same as that of AEx to bonding energy BE in Ru/acac/3.

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sustainable and environmentally friendly energy [ 11 – 13 ]. Several ruthenium complexes have been used as dyes for photovoltaic applications [ 1 – 8 ]. In these complexes, the anchoring groups such as carboxylic acid, dihydroxy, and phosphonic acid on

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Journal of Thermal Analysis and Calorimetry
Authors: Mihaela Badea, Rodica Olar, Dana Marinescu, Valentina Uivarosi, Teodor Nicolescu, and Daniela Iacob

Abstract  

A series of new complexes with mixed ligands of the type RuLm(DMSO)nCl3·xH2O ((1) L: oxolinic acid (oxo), m = 1, n = 0, x = 4; (2) L: pipemidic acid (pip), m = 2, n = 1, x = 2; (3) L: enoxacin (enx), m = 2, n = 1, x = 0; (4) L: levofloxacin (levofx), m = 2, n = 2, x = 8; DMSO: dimethylsulfoxide) were synthesized and characterized by chemical analysis, IR and electronic data. Except oxolinic acid that behaves as bidentate, the other ligands (quinolone derivatives and DMSO) act as unidentate. Electronic spectra are in accordance with an octahedral stereochemistry. The thermal analysis (TG, DTA) in synthetic air flow elucidated the composition and also the number and nature of both water and DMSO molecules. The TG curves show 3–5 well-separated thermal steps. The first corresponds to the water and/or DMSO loss at lower temperatures followed either by quinolone thermal decomposition or pyrolisys at higher temperatures. The final product is ruthenium(IV) oxide.

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Journal of Thermal Analysis and Calorimetry
Authors: Berta Holló, Milena Krstić, Sofija P. Sovilj, György Pokol, and Katalin Mészáros Szécsényi

Introduction The search for effective anticancer compounds based on metal centers has been developed in the last few decades of the twentieth century. Ruthenium complexes are potential alternative drugs to cisplatin, some of

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Journal 2012 , 18 , 14717 – 14724 . “ A fast-initiating ionically tagged ruthenium complex: a robust supported pre-catalyst for batch-process and continuous-flow olefin metathesis ” E. Borre , M. Rouen , I. Laurent , M

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