Structure and properties of a Mo oxide catalyst supported on hollow carbon nanofibers in selective propene oxidation

Ressler, Thorsten; Walter, Anke; Scholz, Juliane; Tessonnier, Jean‐Philippe

doi:10.1016/j.jcat.2010.02.009

Cited by 30 publications

(13 citation statements)

References 25 publications

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“…The accuracy of the mean bond length R and coordination numbers ( CN s), including systematic errors, for the S shells are within 0.02 Å and 20 %, respectively 22–23. Confidence limits of adjusted parameters (precision), as calculated from a variation of the fit residual ( Res ) within 95 % of its optimal value19c are, however, generally at least two times better.…”

Section: Methodsmentioning

confidence: 86%

Mercury‐Sequestering Pseudopeptides with a Tris(cysteine) Environment in Water

et al. 2012

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The three pseudopeptides L 1-3 having three converging cysteine arms anchored on a nitrilotriacetic acid scaffold, are demonstrated to be efficient sulfur-based Hg II chelating agents. The three ligands differ by the nature of the carbonyl group of the cysteine moieties, ester, amide, and carboxylate for L 1 , L 2 , and L 3 , respectively. The coordination chemistry of the mercury thiolate complexes was characterized in water by acid-base titration and several spectroscopic methods, including UV, 1 H, and 199 Hg NMR spectroscopy and Hg-L III EXAFS. At alkaline pH, they form monometallic complexes with typical signatures of a trigonal HgS 3 coordination site, which is uncommon, as Hg II usually prefers a coordination number of two. The digonal HgS 2 structure is formed at acidic pH, where one cysteine group is protonated (HgLH complex). EXAFS spectra at liquid He temperature and alk-

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Section: Methodsmentioning

confidence: 86%

Mercury‐Sequestering Pseudopeptides with a Tris(cysteine) Environment in Water

et al. 2012

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“…The amplitude reduction factor, S 0 , was fixed to 0.85 from the EXAFS analysis of Hg(SEt) 2 and Hg(SPh) 3 . The accuracy of the mean bond distance R and coordination numbers (CNs), including systematic errors, for the S shells are within 0.02 Å and 20%, respectively. , Confidence limits of adjusted parameters (precision), as calculated from a variation of the fit residual (Res) within 95% of its optimal value, are, however, typically 2 times better.…”

Section: Methodsmentioning

confidence: 99%

Mercury Trithiolate Binding (HgS₃) to a de Novo Designed Cyclic Decapeptide with Three Preoriented Cysteine Side Chains

et al. 2018

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Mercury(II) is an unphysiological soft ion with high binding affinity for thiolate ligands. Its toxicity lies in the interactions with low molecular weight thiols including glutathione and cysteine-containing proteins that disrupt the thiol balance and alter vital functions. However, mercury can also be detoxified via interactions with Hg(II)-responsive regulatory proteins such as MerR, which coordinates Hg(II) with three cysteine residues in a trigonal planar fashion (HgS coordination). The model cyclodecapeptide P, c(GCTCSGCSRP) was designed to promote Hg(II) chelation in a HgS coordination environment through the parallel orientation of three cysteine side chains. The binding motif is derived from the dicysteine P cyclodecapeptide validated previously as a model for d metal transporters containing the binding sequence CxxC. The formation of the mononuclear HgP complex with a HgS coordination is demonstrated using electrospray ionization mass spectrometry, UV absorption, and Hg NMR. Hg L-edge extended X-ray absorption fine structure (EXAFS) spectroscopy indicates that the Hg(II) coordination environment is T-shaped with two short Hg-S distances at 2.45 Å and one longer distance at 2.60 Å. The solution structure of the HgP complex was refined based on H-H NMR constraints and EXAFS results. The cyclic peptide scaffold has a rectangular shape with the three binding cysteine side chains pointing toward Hg(II). The HgPH complex has a p K of 4.3, indicating that the HgS coordination mode is stable over a large range of pH. This low p K value suggests that the preorientation of the three cysteine groups is particularly well-achieved for Hg(II) trithiolate coordination in P.

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“…Logam lainnya seperti NiOdapat digunakan sebagai katalis (Ressler et al, 2010). Kobal oksida memiliki beberapa jenis oksida seperti CoO, Co2O3 dan Co3O4, yang memiliki sifat dan karakteristik bebeda.…”

Section: Pendahuluanunclassified

Preparation and Characterization Of Co3O4 Nano Powder

Yanti

Mukhtar

Astarina

2015

JKV

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Synthesis of Co3O4 has been done using Co(NH3)4.6H2O and KOH as precursors with molar ratio 1:1 M with precipitation method. Several of calcination temperature were done to learn type of mineral phase and crystalinity of Co3O4 synthesized. The XRD analysis revealed that calcination temperature influence crystalinity and mineral phase of Co3O4 prepared and calcination temperature at 700 oC has highest intensity and crystalinity that others. Analysis of particle size was examined using Schererr equation, and the results showed that particle size decrease with calcination temperature. The particle size at 700 oC was = 32.387 nm. Analysis morphology of Co3O4 was examined using SEM technique, and the result revelaed Co3O4 have nearly spherical.DOI :http://dx.doi.org/10.15408/jkv.v0i0.3176.

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Structure and properties of a Mo oxide catalyst supported on hollow carbon nanofibers in selective propene oxidation

Cited by 30 publications

References 25 publications

Mercury‐Sequestering Pseudopeptides with a Tris(cysteine) Environment in Water

Mercury‐Sequestering Pseudopeptides with a Tris(cysteine) Environment in Water

Mercury Trithiolate Binding (HgS₃) to a de Novo Designed Cyclic Decapeptide with Three Preoriented Cysteine Side Chains

Preparation and Characterization Of Co3O4 Nano Powder

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Structure and properties of a Mo oxide catalyst supported on hollow carbon nanofibers in selective propene oxidation

Cited by 30 publications

References 25 publications

Mercury‐Sequestering Pseudopeptides with a Tris(cysteine) Environment in Water

Mercury‐Sequestering Pseudopeptides with a Tris(cysteine) Environment in Water

Mercury Trithiolate Binding (HgS3) to a de Novo Designed Cyclic Decapeptide with Three Preoriented Cysteine Side Chains

Preparation and Characterization Of Co3O4 Nano Powder

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Mercury Trithiolate Binding (HgS₃) to a de Novo Designed Cyclic Decapeptide with Three Preoriented Cysteine Side Chains