14634-91-4Relevant academic research and scientific papers
Tracer diffusion of the tris(1,10-phenanthroline)iron(II) cation in aqueous salt solutions. Effect of hydrophobic interactions
Tominaga, Toshihiro,Matsumoto, Shigetoshi,Koshiba, Takayuki,Yamamoto, Yuroku
, (1988)
Tracer diffusion coefficients for the Fe(phen)2+3 ion (phen = 1,10-phenanthroline) have been measured in aqueous solutions containing Ni(phen)3SO4, Bu4NBr, MgSO4, and NaBr, respectively, at 298.2 K.The diffusion coefficient-viscosity
Logic gates in excitable media
Toth, Agota,Showalter, Kenneth
, p. 2058 - 2066 (1995)
The interaction of chemical waves propagating through capillary tubes is studied experimentally and numerically.Certain combinations of two or more tubes give rise to logic gates based on input and output signals in the form of chemical waves and wave ini
Temperature Dependence of Hydrophobic Ion Association of Tris(1,10-phenanthroline)iron(II) Ion with Arenedisulfonate Ions in Water
Yokoyama, Haruhiko,Koyama, Yuko,Masuda, Yuichi
, p. 1453 - 1456 (1988)
The ion-association constants(K) of (Fe(phen)3)2+ with o- and m-benzenedisulfonate, 2,6- and 2,7-naphthalenedisulfonate ions, determined by conductivity measurements at 0-50 deg C, were considerably larger than the electrostatic prediction: K(2
Coexistence of two bifurcation regimes in a closed ferroin-catalyzed Belousov-Zhabotinsky reaction
Wang, Jichang,Zhao, Jinpei,Chen, Yu,Gao, Qingyu,Wang, Yumei
, p. 1374 - 1381 (2005)
The ferroin-catalyzed Belousov-Zhabotinsky (BZ) reaction was studied in a batch reactor under anaerobic conditions and was found to evolve through two separated regimes of complex oscillations. Significantly, the two bifurcation regimes exhibited qualitatively different dependence on compositions of the reaction mixture, i.e., initial concentrations of bromate, sulfuric acid, malonic acid, and ferroin. The reaction temperature also showed opposite effects on the two bifurcation regimes, in which complexities of the first bifurcation regime were enhanced while oscillations in the second bifurcation regime became simpler as a result of decreasing temperature. Numerical simulations with a 12-variable model developed specifically for the ferroin-BZ system were able to reproduce transient complex oscillations observed in experiments. These calculations further illustrated that reactions such as ferroin and HOBr, ferroin and HBrO2, and ferriin and Br- were not essential in describing complex dynamics of the ferroin-BZ reaction.
A Completely Inorganic BZ-Type Oscillator in a Closed Homogeneous System
Li, Hexing,Shen, Chun
, p. 1539 - 1543 (1997)
In a batch reactor, an absolutely homogeneous inorganic Belousov-Zhabotinskii (BZ)-type oscillator has been designed in the system of BrO3--H2PO2--Mn 2+-Fe(Phen)32+-H2SO4. The oscillations of both [Br-] and [Mn3+]/[Mn2+] as well as [Fe(phen)33+]/[Fe(phen)32+] were observed by monitoring the changes of either the potential on a bromide electrode or the absorbance at the maximum absorbance wavelength for Mn3+ and Fe(phen)33+, respectively. Both of those two metallic ions are essential in the present system to give rise to the oscillations; their roles in the oscillation are discussed. It is found that Mn2+ can not be replaced by other substances, while Fe(phen)32+ can be replaced by either N2 flow or acetone. However, it can not be replaced by other metallic ions, including Mn2+ and Ce3+. Those results suggest that Mn2+ is the real oscillating catalyst for an autocatalytic formation of HBrO2 and Fe(phen)32+ is a catalyst for the catalytic reduction of Br2 by H2PO2- to remove any excess Br2 produced during the oscillations.
Chemical wave in the un-illuminated aminophenol-bromate beads system
Harati, Mohammad
, p. 126 - 129 (2009)
We report observation of slow oscillations and slow waves in the aminophenol system. The system with slow oscillations in the stirred batch reactor does not always exhibit slow waves. The unperturbed system exhibits more than 2 days of wave activity, whil
Spiral Wave Dynamics as a Function of Proton Concentration in the Ferroin-Catalyzed Belousov-Zhabotinskii Reaction
Plesser, Theo,Mueller, Stefan C.,Hess, Benno
, p. 7501 - 7507 (1990)
The dependence of the geometry and dynamics of spiral waves on the excitability of the ferroin-catalyzed Belousov-Zhabotinskii reaction was investigated in detail by computerized high-resolution spectrophotometry.Many time series of digital images were recorded by using solution layers prepared with different sulfuric acid concentrations (0.15 -0.70 M), which control the excitability of the medium through the resulting H+ concentration.While spirals generated in highly excitable media (high acidity) are almost Archimedian, there are pronounced deviations from this geometry with decreasing excitability (low acidity).The motion of the tip of regular spirals proceeds in a circle around a spatially stable rotation center, but in systems of low excitability it performs several loops.This compound motion often resembles a prolate epicycloid.During each loop there exists a well-defined temporary center reminiscent of that found in regular spiral rotation.The distorted spiral geometries are described quantitatively, and data for the average ferriin concentration, wave amplitude, and maximum gradients are given as a function of proton concentration.With decreasing +> the wave amplitude and maximum ferriin gradient increase and the average ferriin concentration decreases.These functional dependencies are smooth, and no evidence for a qualitative transition is found in the investigated +> range.
Anomalously Slow Electron Transfer at Ordered Graphite Electrodes: Influence of Electronic Factors and Reactive Sites
Cline, Kristin Kneten,McDermott, Mark T.,McCreery, Richard L.
, p. 5314 - 5319 (1994)
Electron-transfer rates for 17 inorganic redox systems plus methyl viologen were determined on highly ordered pyrolytic graphite (HOPG) and glassy carbon (GC).Provided the HOPG defect density is low, the electron-transfer rates of all systems are much slower on the basal plane of HOPG than on GC.The slow rates on HOPG show a trend with the homogenous self-exchange rate constants, but in all cases the HOPG rate constants are substantially lower than that calculated via Marcus theory from self-exchange rates.The low HOPG rates do not exhibit any trends with redox system charge or E1/2, as might be expected in the presence of double-layer or hydrophobic effects.The results are consistent with the semimetal properties of HOPG, which have been invoked to explain its low interfacial capacitance.Both the density of electronic states (DOS) and carrier density for HOPG are much lower than those for metals.By analogy to theories developed for electron transfer at semiconductor electrodes, the rate dependsd on an effectively bimolecular reaction between the redox system and carriers in the electrode.The low DOS and carrier density of HOPG leads to low electron-transfer rates compared to those of metals, or to those predicted from exchange rates.Disorder in the graphite increases electron-tranfer rates and the DOS, thus yielding much faster rates on both GC and defective HOPG.For the 14 outer-sphere systems studied here, this electronic factor is much more important than any interaction with specific surface sites present at defects.The evidence indicates that, for Fe(CN)6-3/-4, Euaq+2/+3, Feaq+2/+3, and Vaq+2/+3, specific surface interactions provide inner-sphere routes which have a large effect on the observed rate constant.
Preparation, spectroscopic characterization and solid state electrical conductance of bimetallic salts of the type [M(L-L)3][M'(MNT)2] . Part II
Singh, Nanhai,Prasad, Lal Bahadur
, p. 627 - 646 (1996)
Complex bimetallic salts of the type [M(L-L)3[M'(MNT)2] [M=Ni(II), Zn(II), Cd(II), Fe(I]), Co(II), Cu(II) and Ru(II); M' = Ni(II) and Co(II); L-L = 2,2'-bipyridyl (bipy) ; 1,10-phenanthroline (o-phen) or ethylenediamine (en); MNT = 1,2-dicyano-
Direct Synthesis of Intermetallic Platinum-Alloy Nanoparticles Highly Loaded on Carbon Supports for Efficient Electrocatalysis
Antink, Wytse Hooch,Bootharaju, Megalamane S.,Cho, Sung-Pyo,Hyeon, Taeghwan,Jung, Euiyeon,Kim, Jiheon,Kim, Yong Min,Lee, Byoung-Hoon,Lee, Dong Wook,Lee, Eungjun,Lee, Hyeon Seok,Lee, Jongmin,Sinha, Arun Kumar,Sung, Yung-Eun,Yoo, Ji Mun,Yoo, Sung Jong,Yoo, Tae Yong
, p. 14190 - 14200 (2020/09/16)
Compared to nanostructured platinum (Pt) catalysts, ordered Pt-based intermetallic nanoparticles supported on a carbon substrate exhibit much enhanced catalytic performance, especially in fuel cell electrocatalysis. However, direct synthesis of homogeneous intermetallic alloy nanocatalysts on carbonaceous supports with high loading is still challenging. Herein, we report a novel synthetic strategy to directly produce highly dispersed MPt alloy nanoparticles (M = Fe, Co, or Ni) on various carbon supports with high catalyst loading. Importantly, a unique bimetallic compound, composed of [M(bpy)3]2+ cation (bpy = 2,2′-bipyridine) and [PtCl6]2- anion, evenly decomposes on carbon surface and forms uniformly sized intermetallic nanoparticles with a nitrogen-doped carbon protection layer. The excellent oxygen reduction reaction (ORR) activity and stability of the representative reduced graphene oxide (rGO)-supported L10-FePt catalyst (37 wt %-FePt/rGO), exhibiting 18.8 times higher specific activity than commercial Pt/C catalyst without degradation over 20a ?000 cycles, well demonstrate the effectiveness of our synthetic approach toward uniformly alloyed nanoparticles with high homogeneity.
