Bimetallic Iron Research Articles

Bimetallic iron complexes with carboxyethylene bridges

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBimetallic iron complexes with carboxyethylene bridgesDorothy H. Gibson, Jaime O. Franco, Michael T. Harris, and Tek Sing OngCite this: Organometallics 1992, 11, 6, 1993–1994Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://doi.org/10.1021/om00042a007RIGHTS & PERMISSIONSArticle Views57Altmetric-Citations22LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (311 KB) Get e-Alerts Get e-Alerts

The synthesis and reactions of palladium–iron carbonyl complexes containing bridging Ph2PCH2PPh2ligands

Treatment of a tetrahydrofuran solution of Fel2, with two equivalents of Ph2PCH2PPh2(dppm), under an atmosphere of CO, gave trans,mer-[Fel2(CO)(dppm-PP′)(dppm-P)](1b) in high yield. The bromide analogue was prepared similarly but was unstable. Treatment of compound (1b) with [Pd(dba)2](dba = dibenzylideneacetone) in benzene, under an atmosphere of CO, gave the bimetallic iron(I)–palladium(I) complex [lFe(CO)2(µ-dppm)2Pdl](2c). Complex (2c) was protonated by HBF4·OEt2, to give the cationic hydride [lFe(CO)2(µ-dppm)2(µ-H)Pdl]BF4, which was characterised only in solution. Treatment of (2c) with MeNC caused displacement of both iodide and carbonyl ligands from iron to give [(MeNC)3Fe(µ-dppm)2PdI]I, whereas treatment of (2c) with the bulky isocyanide ButNC displaced only iodide to give [(ButNC)(OC)2Fe(µ-dppm)2PdI]I. N.m.r. (1H- and 31P-{1H}) and i.r. data are reported.

Synthesis and structure of a bimetallic iron carbonyl-diazadiphosphetidine complex, Fe2(CO)8[P2(Me3CN)2(H)2

L'etude par diffraction RX montre que le complexe contient un cycle a 4 chainons diazadiphosphetidine avec chaque atome P lie a un groupe Fe(CO) 4

Iron alloy Fischer-Tropsch catalysts: III. Conversion dependence of selectivity and water-gas shift

The performance of several silica-supported iron bimetallic and potassium-promoted iron catalysts has been investigated for the conversion of carbon monoxide to hydrocarbons. The systems studied were Fe-Ni, Fe-Co, Fe-Cu, Fe-K, and the pure metals of Fe, Ni, and Co. Alloy formation and catalyst carburization were characterized using Mössbauer effect spectroscopy. Specific reaction rates, measured in a differential flow reactor at atmospheric pressure, were based on the amount of hydrogen chemisorbed during a novel chemisorption experiment involving flow desorption from catalysts cooled in H 2. When used as synthesis catalysts, the Fe, Fe-K, and Fe-Cu catalysts carburized completely. Alloying Co with Fe suppresses carbide formation. The pure Ni and Co catalysts do not carburize in the reaction mixture although they do carburize in pure CO. The iron-nickel catalysts carburize rapidly but incompletely, with preferential carburization of the bcc phase. Over the 1–6% conversion range studied, Ni, Co, and Fe-Ni showed no turnover frequency sensitivity for CH 4 formation, while Fe, Fe-K, Fe-Cu, and Fe-Co were strongly inhibited, with turnover frequency decreasing by a factor of 2 or more with increasing conversion. The ratio of CO 2 H 2 O , used as a measure of water-gas shift activity, was also determined as a function of conversion for the catalysts studied. It was found that the catalysts which are good water-gas shift catalysts are also the ones inhibited during the synthesis. These observations are discussed in terms of a model based on product inhibition by water formation. The olefin/paraffin ratio and its dependence on conversion are reported for all catalysts studied. Synergism is observed upon alloying Fe with Co. The Fe-Co catalyst produced the highest olefin content, has the highest water-gas shift activity, and it also has excellent ability to incorporate olefins into growing chains.

Bimetallic iron carbonyl derivatives of bidentate phosphine ligands

Bimetallic iron carbonyl derivatives of bidentate phosphine ligands