- Photoelectron Emission Study of Iron(II) and Cobalt(II) Complexes in Aqueous Solution. Reorganization Energies
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The photoelectron emission threshold energies of FeII and CoII complexes in aqueous solutions have been determined.The values could be successfully used for obtaining the reorganization energies in the one-electron oxidation reaction
- Watanabe, Iwao,Ono, Kaori,Ikeda, Shigero
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- Moessbauer Study of Iron-containing Zeolites
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Metal-loaded zeolites combine the advantages of shape selectivity and high metal dispersion and have therefore been investigated from the point of view of their catalytic performance, especially for hydrogenation and Fischer-Tropsch synthesis.In the case of iron, Moessbauer spectroscopy offers a valuable means for the characterization of the electronic and chemical structure arising from the interaction between a metal ion and a solid electrolyte and also allows a quantitative determination of exchange-site population.In this paper comparative Moesbauer studies of 57Fe on various zeolites starting from different precursors are presented with the aim of selectively controlling the location of the metal ion or complex in the exchange sites.Complex ions of the type 2+ with L=1,10-phenanthroline or 2,2'-dipyridyl have been exchanged in X- and Y-zeolites and the evolution with thermal treatment under vacuum of the exchange-site population has been investigated.An attempt has also been made to define better the exchange sites for Fe2+ in the particular structure of zeolite ZSM-5.
- Petrera, Michele,Gennaro, Antonio,Gherardi, Paola,Gubitosa, Giuseppe,Pernicone, Nicola
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- Boron cluster anions [BnHn]2- (n = 10, 12) in reactions of iron(II) and iron(III) complexation with 2, 2?-bipyridyl and 1, 10-phenanthroline
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Complexation of FeII and FeIII with azaheterocyclic ligands L (L = phen or bipy) were studied in the presence and in the absence of boron cluster anions [BnHn]2- (n = 10, 12). The reactions were carried out in air at room temperature in organic solvents and/or water. In all the solvents used, well known [FeL3]An (An = 2Cl- or SO42-) ferrous complexes were formed from FeII salts. Composition of ferric complexes with L ligands depends on the nature of solvent: either dinuclear oxo-iron(III) chlorides [L2ClFeIII-O-FeIIIL2Cl]Cl 2 or ferric ferrates(III) [FeIIIL2Cl 2][FeIIICl4], or [FeIIIL 2Cl2][FeIIICl4L] were isolated from FeIII salts. Introduction of the closo-borate anions to a Fe 3+(or Fe2+)/L/solv. mixture stabilizes ferrous cationic complexes [FeL3]2+ in all the solvents used: only ferrous [FeL3][BnHn] (n = 10, 12) complexes were isolated from all the reaction mixtures in the presence of boron cluster anions. Copyright
- Avdeeva, Varvara V.,Goeva, Lyudmila V.,Malinina, Elena A.,Kuznetsov, Nikolay T.,Vologzhanina, Anna V.
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- Direct Synthesis of Intermetallic Platinum-Alloy Nanoparticles Highly Loaded on Carbon Supports for Efficient Electrocatalysis
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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.
- 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
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- PH-tuned metal coordination and peroxidase activity of a peptide dendrimer enzyme model with a Fe(ii)bipyridine at its core
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Peptide dendrimer BP1 was obtained by double thioether bond formation between 5,5′-bis(bromomethyl)-2,2′-bipyridine and two equivalents of peptide dendrimer N1 (Ac-Glu-Ser)8(Dap-Glu-Ala)4(Dap-Amb- Tyr)2Dap-Cys-Asp-NH2
- Geotti-Bianchini, Piero,Darbre, Tamis,Reymond, Jean-Louis
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supporting information
p. 344 - 352
(2013/02/25)
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- Synthesis, characterization, and conducting properties of heterobimetallic salts of cyanoiminomethanedithiolate ligand
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Heterobimetallic ion-pair complexes of the type [M(bpy)3] [M′(cdc)3] (M = Fe2+, Co2+, and Ni 2+; M′ = Ni2+ and Cu2+; bpy = 2,2′-bipyridine, cdc2- = cyanoiminomethanedithiolate (C 2N2S22-)) have been synthesized by reacting a solution of K2[M′(cdc)2] with [M(bpy)3]X2 (X = Cl- and SO4 2-) in equimolar ratio. These complexes have been characterized by elemental analysis, solution conductance, and magnetic susceptibility measurements, IR, 1H and 13CNMR, ESR, and UV-visible spectroscopies and pressed pellet conductivity technique. Three of these salts show behavior of semiconductors in the 295-443 K temperature range while the remaining are insulators. The lowering of the V(C=N) frequency in I 2-doped products of these complexes as compared to the parent complexes clearly reveals interaction of the C=N group of the ligand cdc 2- resulting in decrease in V(C=N) bond order and in turn partial reduction of I2. The Ii-doped products of the majority of the complexes show enhanced room-temperature conductivity and exhibit semiconducting behavior.
- Singh, Nanhai,Singh, Bandana
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p. 262 - 267
(2009/03/12)
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