12137-44-9Relevant articles and documents
Soluble Cytotoxic Ruthenium(II) Complexes with 2-Hydrazinopyridine
Soliman,Attaby,Alajrawy,Majeed,Sahin,Varlikli
, p. 742 - 754 (2019)
New water soluble Ru(II) binary complex [Ru(C5H7N3)(X)(H2O)2] with 2-hydrazinopyridine and its ternary complexes with X = dichloride, oxalate, malonate or pyrophosphate ligands have been synthesized. The complexes have been characterized using elemental analyses, mass, IR, and UV-Vis. spectroscopies, cyclic voltammetry, magnetic susceptibility, and thermal analysis. The complexes are diamagnetic and the electronic spectral data showed that peaks are due to low spin octahedral Ru(II) complexes. The optimized structures of the complexes 1–4 indicate distorted octahedral geometry with bond angles around the ruthenium atom ranged from 80.44° to 99.64°. The values of the electronic energies (?635 to ?1145 a.u.), the highest occupied molecular orbital energies (?0.181 to 0.073 a.u.) and lowest unoccupied molecular orbital energies (?0.056 to 0.167 a.u.) indicate the stability of the complexes. The complexes are polarized as indicated from the dipole moment values (9.39–14.27 Debye). The complexes have noticeable cytotoxicity with IC50 (μM): 0.011–0.062 (HepG-2), 0.015–0.080 (MCF-7), 0.015–0.116 (HCT-116), and PC-3 (0.034–0.125).
A nickel-borate nanoarray: a highly active 3D oxygen-evolving catalyst electrode operating in near-neutral water
Ji, Xuqiang,Cui, Liang,Liu, Danni,Hao, Shuai,Liu, Jingquan,Qu, Fengli,Ma, Yongjun,Du, Gu,Asiri, Abdullah M.,Sun, Xuping
, p. 3070 - 3073 (2017)
The exploration of high-performance and cost-effective water oxidation catalysts operating under mild conditions is still urgent and challenging. In this communication, a nickel-borate nanoarray supported on carbon cloth (Ni-Bi/CC) has been fabricated through oxidative polarization of a nickel oxide nanoarray on CC (NiO/CC) in a borate electrolyte (pH 9.2). As a 3D electrode, this Ni-Bi/CC exhibits superior catalytic activity for water oxidation in 0.1 M potassium borate (K-Bi) solution, yielding a geometrical catalytic current density of 10 mA cm-2 at an overpotential of 470 mV. Notably, this electrode also demonstrates outstanding long-term electrochemical durability for 25 h with 100% Faradaic efficiency.
Synthesis, spectroscopic, thermal, antimicrobial and electrochemical characterization of some novel Ru(iii), Pt(iv) and Ir(iii) complexes of pipemidic acid
Alibrahim, Khuloud A.,Al-Saif, Foziah A.,Alghamdi,El-Shahawi,Moustafa,Refat, Moamen S.
, p. 22515 - 22529 (2018)
Three new solid complexes of pipemidic acid (Pip-H) with Ru3+, Pt4+ and Ir3+ were synthesized and characterized. Pipemidic acid acts as a uni-dentate chelator through the nitrogen atom of the -NH piperazyl ring. The spectroscopic data revealed that the general formulas of Pip-H complexes are [M(L)n(Cl)x]·yH2O ((1) M = Ru3+, L: Pip-H, n = 3, x = 3, y = 6; (2) M = Pt4+, L: Pip-NH4, n = 2, x = 4, y = 0 and (3) M = Ir3+, L: Pip-H, n = 3, x = 3, y = 6). The number of water molecules with their locations inside or outside the coordination sphere were assigned via thermal analyses (TG, DTG). The DTG curves refer to 2-3 thermal decomposition steps where the first decomposition step at a lower temperature corresponds to the loss of uncoordinated water molecules followed by the decomposition of Pip-H molecules at higher temperatures. Thermodynamic parameters (E?, ΔS?, ΔH? and ΔG?) were calculated from the TG curves using Coats-Redfern and Horowitz-Metzeger non-isothermal models. X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques were carefully used to assign properly the particle sizes of the prepared Pip-H complexes. The biological enhancement of Pip-H complexes rather than free chelate were assessed in vitro against four kinds of bacteria G(+) (Staphylococcus epidermidis and Staphylococcus aureus) and G(-) (Klebsiella and Escherichia coli) as well as against the human breast cancer (MCF-7) tumor cell line.
Photochemical Decomposition of RuO4
Zimmerman, George L.,Riviello, Sylvia J.,Glauser, Todd A.,Kay, Jack G.
, p. 2399 - 2404 (1990)
For the first time, the photochemical decomposition of gaseous RuO4 as a function of wavelenght has been studied.Two types of studies were employed: (a) irradiation with a constant-intensity mercury arc, isolating lines with filters, and (b) flash photolysis and kinetic absorption spectroscopy using a xenon flash lamp and liquid solution filters.The steady mercury arc irradiation gave quantum yields as a function of wavelength, and the flash photolysis experiments gave spectra of previously unreported products.Photochemical reactions of RuO4 have been determined for three spectral regions: (I) 440 - 370, (II) 370 - 320, and (III) 320 - 240 nm.For (I) the product is a solid, thin film of RuO3 deposited on the cell wall, and the quantum yield is 0.05; for (II) the product is a solid RuO2 aerosol with submicron-sized particles, and the quantum yields are 1.0 - 1.2; for (III) both RuO3 and RuO2 are formed simultaneously in the forms described above, and in addition, on a microsecond time scale, absorption spectra of gaseous RuO and Ru are observed.These results are interpreted in terms of two thresholds for predissociation or, more likely, vibrationally hot molecule dissociation, one at ca. 370 nm for dissociation to O2 and RuO2 and another at ca 320 nm for breaking a single Ru-O bond.The observed threshold energies agree well with thermodynamic estimates.The production of RuO and Ru species is attributed to secondary dark reactions involving O atoms.
Synthesis, structure, spectroscopic properties, electrochemistry, and DFT correlative studies of trans-[Ru(P-P)2Cl2] complexes
Al-Noaimi, Mousa,Warad, Ismail,Abdel-Rahman, Obadah S.,Awwadi, Firas F.,Haddad, Salim F.,Hadda, Taibi B.
, p. 110 - 119 (2013/10/22)
Five trans-[Ru(P-P)2Cl2] complexes were prepared by reacting RuCl2(PPh3)3 with P-P ligands {P-P = 3-hexyl-1,3-bis(diphenylphosphino)propane (hdppp) (1); = 1,3- bis(diphenylphosphino)propane (dppp) (2); = 1,2-bis(diphenylphosphino)ethane (dppe) (3); 1.1′-bis(diphenylphosphino)methane (dppm) (4); 1,2-bis(diphenylphosphino)ethylene (depe) (5)}. The complexes were characterized by an elemental analysis, IR, 1H, 13C and 31P{1H}NMR, FAB-MS and TG/DTA. These Ru(II) complexes showed Ru(III)/Ru(II) quasireversible redox couple. The molecular structures of the complexes 1 and 3 were determined by X-ray crystallography, and their spectroscopic properties were studied. Another polymorph of 3 was reported in literature, the reported polymorph of 3 in this work crystallizes in P1 space group, whereas, the previously reported polymorph crystallizes in C2/c space group. The two complexes adopt a distorted trans octahedral coordination and ruthenium(II) ions are located on a crystallographic centre of symmetry. Based on the optimized structures, computational investigations were carried out in order to determine the electronic structures of the complexes. The electronic spectra of 1 and 1+ in dichloromethane were calculated with the use of time-dependent DFT methods, and the electronic spectra of the transitions were correlated with the molecular orbitals of the complexes.
Synthesis, spectral, thermal, X-ray single crystal of new RuCl 2(dppb)diamine complexes and their application in hydrogenation of Cinnamic aldehyde
Warad, Ismail,Al-Hussain, Hanan,Al-Far, Rawhi,Mahfouz, Refaat,Hammouti, Belkheir,Hadda, Taibi Ben
, p. 374 - 381 (2012/07/14)
The preparation of new three trans-[RuCl2(dppb)(N-N)] with mixed diamine (N-N) and 1,4-bis-(diphenylphosphino)butane (dppb) ligands, starting from RuCl2(PPh3)3 as precursor is presented. The complexes are charac
Thermal decomposition of new ruthenium(II) complexes containing N-alkylphenothiazines
Sovilj, Sofija P.,Pokol, Gyoergy,Szecsenyi, Katalin Meszaros,Hollo, Berta,Krstic, Milena
, p. 27 - 32 (2011/10/11)
Thermal decomposition of chlorpromazine hydrochloride (CP?HCl), trifluoperazine dihydrochloride (TF?2HCl) and thioridazine hydrochloride (TR?HCl), and the ruthenium complexes with dimethyl sulfoxide (dmso) of composition [RuCl2(dmso)4] and L[RuCl3(dmso) 3]?xEtOH, L = CP?HCl, TF?2HCl orTR?HCl is described. The phenothiazines are stable to temperature range of 200-280 °C with an increasing stability order of TF?2H Cl 3(dmso)3]Cl?EtOH. The compound crystallizes with one EtOH, evaporating in part at room temperature.
Spectral and thermal studies on ruthenium carbonyl complexes with 5-trifluoromethyl-2,4-dihydropyrazol-3-one ligands
Soliman, Ahmed A.
, p. 852 - 857 (2008/02/03)
Reactions of the cluster compound [Ru3(CO)12] with 5-trifluoromethyl-2,4-dihydropyrazol-3-one (HL1), 4-(2,4-dichlorophenylhydrazono)-5-trifluoromethyl-2,4-dihydropyrazol-3-one (H2L2), 4-(3-fluoropheny
Kinetic study of the reaction of Ru(a 5F5) with N2O and O2 from 296 to 623 K
Campbell, Mark L.
, p. 4377 - 4384 (2007/10/03)
The gas-phase reactivity of Ru(a 5F5) with N2O and O2 in the temperature range 296-623 K is reported. Ruthenium atoms were produced by the photodissociation of ruthenocene and detected by laser-induced fluorescence. The reaction rate of the ground a 5F5 state with N2O is very slow and temperature dependent. The bimolecular rate constant exhibits marked non-Arrhenius behaviour. The rate constants are described by the empirical relation ln(k) = (-54.4 ± 0.2) + (3.95 ± 0.04)ln T or, alternatively, by the biexponential relation k(T) = (1.3 ± 0.3) × 10-12 exp(-11.1 ± 0.5 kJ mol-1/RT) + (1.9 ± 1.9) × 10-10 exp(-37.8 ± 5.7 kJ mol-1/RT) cm3 s-1 where the uncertainties are ±σ. The disappearance rates in the presence of N2O are independent of buffer gas identity (Ar or N2) and total pressure indicating a bimolecular abstraction mechanism. The reaction rate of the a 5F5 state with O2 is pressure dependent and decreases with increasing temperature indicating adduct formation. The limiting low-pressure third-order, k0, and limiting high-pressure second-order, k∞, room-temperature rate constants in argon buffer are (5.2 ± 0.7) × 10-29 cm6 s-1 and (2.8 ± 0.2) × 10-11 cm3 s-1, respectively. In N2, k0 and k∞ are (1.1 ± 0.2) × 10-28 cm6 s-1 and (6.3 ± 0.3) × 10-11 cm3 s-1, respectively. An upper limit of 498 kJ mol-1 is established for the bond energy of RuO(g) based on the lack of a bimolecular reaction for Ru(g) with O2.
