“Chain-Like” Trimetallic Ruthenium Complexes with C7Carbon-Rich Bridges: Experimental and Theoretical Investigations of Electronic Communication Tuning in Five Distinct Oxidation States

2010 ◽  
Vol 132 (16) ◽  
pp. 5638-5651 ◽  
Author(s):  
Céline Olivier ◽  
Karine Costuas ◽  
Sylvie Choua ◽  
Vincent Maurel ◽  
Philippe Turek ◽  
...  
Keyword(s):  
Electronic Communication ◽  
Ruthenium Complexes ◽  
Oxidation States ◽  
Theoretical Investigations

Some ruthenium complexes containing cyanocarbon ligands: syntheses, structures and extent of electronic communication in binuclear systems

2004 ◽  
Vol 689 (21) ◽  
pp. 3308-3326 ◽  
Author(s):  
Michael I. Bruce ◽  
Mark A. Buntine ◽  
Karine Costuas ◽  
Benjamin G. Ellis ◽  
Jean-François Halet ◽  
...  
Keyword(s):  
Electronic Communication ◽  
Ruthenium Complexes

Synthesis and electrochemical properties of bimetallic η5-indenyl ruthenium complexes

2009 ◽  
Vol 87 (1) ◽  
pp. 134-138 ◽  
Author(s):  
Quan Yuan Hu ◽  
Guochen Jia
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Properties ◽  
Electronic Communication ◽  
Ruthenium Complexes ◽  
Hydride Complex

Treatment of RuCl(dppm)(η5-C9H7) with alkynes HC≡C(C6H4)nC≡CH (n = 1, 2) in the presence of TlPF6 and t-BuONa affords the bimetallic ruthenium acetylide complexes [(η5-C9H7)(dppm)Ru]2(µ-C≡C(C6H4)nC≡C). Reactions of the hydride complex RuH(dppm)(η5-C9H7) with HC≡C(C6H4)nC≡CH (n = 1, 2) in refluxing toluene give the bimetallic ruthenium alkenyl complexes [(η5-C9H7)(dppm)Ru]2(µ-CH=CH(C6H4)nCH=CH). The electrochemical properties of the new complexes have been investigated by cyclic voltammetry, which reveals that the organic spacer –CH=CHC6H4CH=CH– is more effective than –C≡CC6H4C≡C– in mediating electronic communication between the two ruthenium moieties.Key words: ruthenium, bimetallic, acetylide, insertion, electrochemistry.

C7and C9Carbon-Rich Bridges in Diruthenium Systems:  Synthesis, Spectroscopic, and Theoretical Investigations of Different Oxidation States

2006 ◽  
Vol 128 (17) ◽  
pp. 5859-5876 ◽  
Author(s):  
Stéphane Rigaut ◽  
Céline Olivier ◽  
Karine Costuas ◽  
Sylvie Choua ◽  
Omrane Fadhel ◽  
...  
Keyword(s):  
Oxidation States ◽  
Theoretical Investigations

Ruthenium complexes in different oxidation states: synthesis, crystal structure, spectra and redox properties

2013 ◽  
Vol 42 (17) ◽  
pp. 6092 ◽  
Author(s):  
Agnieszka Jabłońska-Wawrzycka ◽  
Patrycja Rogala ◽  
Sławomir Michałkiewicz ◽  
Maciej Hodorowicz ◽  
Barbara Barszcz
Keyword(s):  
Crystal Structure ◽  
Ruthenium Complexes ◽  
Redox Properties ◽  
Oxidation States

scholarly journals Ruthenium Complexes with 2-Pyridin-2-yl-1H-Benzimidazole as Potential Antimicrobial Agents: Correlation between Chemical Properties and Anti-Biofilm Effects

2021 ◽  
Vol 22 (18) ◽  
pp. 10113
Author(s):  
Agnieszka Jabłońska-Wawrzycka ◽  
Patrycja Rogala ◽  
Grzegorz Czerwonka ◽  
Katarzyna Gałczyńska ◽  
Marcin Drabik ◽  
...  
Keyword(s):  
Antimicrobial Agents ◽  
Ruthenium Complexes ◽  
Chemical Properties ◽  
Oxidation States ◽  
Health Concern ◽  
Ru Complexes ◽  
Initial Binding ◽  
Aggregation Phenomenon ◽  
Better Than ◽  
Urgent Action

Antimicrobial resistance is a growing public health concern that requires urgent action. Biofilm-associated resistance to antimicrobials begins at the attachment phase and increases as the biofilms maturate. Hence, interrupting the initial binding process of bacteria to surfaces is essential to effectively prevent biofilm-associated problems. Herein, we have evaluated the antibacterial and anti-biofilm activities of three ruthenium complexes in different oxidation states with 2-pyridin-2-yl-1H-benzimidazole (L1 = 2,2′-PyBIm): [(η6-p-cymene)RuIIClL1]PF6 (Ru(II) complex), mer-[RuIIICl3(CH3CN)L1]·L1·3H2O (Ru(III) complex), (H2L1)2[RuIIICl4(CH3CN)2]2[RuIVCl4(CH3CN)2]·2Cl·6H2O (Ru(III/IV) complex). The biological activity of the compounds was screened against Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa strains. The results indicated that the anti-biofilm activity of the Ru complexes at concentration of 1 mM was better than that of the ligand alone against the P. aeruginosa PAO1. It means that ligand, in combination with ruthenium ion, shows a synergistic effect. The effect of the Ru complexes on cell surface properties was determined by the contact angle and zeta potential values. The electric and physical properties of the microbial surface are useful tools for the examined aggregation phenomenon and disruption of the adhesion. Considering that intermolecular interactions are important and largely define the functions of compounds, we examined interactions in the crystals of the Ru complexes using the Hirshfeld surface analysis.

scholarly journals Observation of novel charge ordering and spin reorientation in perovskite oxide PbFeO3

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xubin Ye ◽  
Jianfa Zhao ◽  
Hena Das ◽  
Denis Sheptyakov ◽  
Junye Yang ◽  
...  
Keyword(s):  
Physical Properties ◽  
Charge Ordering ◽  
Spin Reorientation ◽  
Perovskite Oxide ◽  
Oxidation States ◽  
Ferromagnetic Transition ◽  
Detailed Structure ◽  
Theoretical Investigations ◽  
Spin Moments ◽  
Magnetic Sublattices

AbstractPbMO3 (M = 3d transition metals) family shows systematic variations in charge distribution and intriguing physical properties due to its delicate energy balance between Pb 6s and transition metal 3d orbitals. However, the detailed structure and physical properties of PbFeO3 remain unclear. Herein, we reveal that PbFeO3 crystallizes into an unusual 2ap × 6ap × 2ap orthorhombic perovskite super unit cell with space group Cmcm. The distinctive crystal construction and valence distribution of Pb2+0.5Pb4+0.5FeO3 lead to a long range charge ordering of the -A-B-B- type of the layers with two different oxidation states of Pb (Pb2+ and Pb4+) in them. A weak ferromagnetic transition with canted antiferromagnetic spins along the a-axis is found to occur at 600 K. In addition, decreasing the temperature causes a spin reorientation transition towards a collinear antiferromagnetic structure with spin moments along the b-axis near 418 K. Our theoretical investigations reveal that the peculiar charge ordering of Pb generates two Fe3+ magnetic sublattices with competing anisotropic energies, giving rise to the spin reorientation at such a high critical temperature.

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