Itoh Group Literature Review

RSC - Chem. Commun. latest articles by Xiujuan Wu  /  17h  //  keep unread  //  hide  //  preview Chem. Commun. , 2015, Accepted Manuscript DOI : 10.1039/C4CC10411K, Communication Xiujuan Wu, Xiaonan Yang, Yong-Min Lee, Wonwoo Nam, Licheng Sun A mononuclear nonheme manganese(IV)-oxo complex, [MnIV(O)(BQCN)]2+, was generated in the photocatalytic reaction of a manganese(II) complex, [MnII(BQCN)]2+, with [RuII(bpy)3]Cl2 as a photosensitizer, [CoIII(NH3)5Cl]Cl2 as a low-cost sacrificial electron acceptor, and... The content of this RSS Feed (c) The Royal Society of Chemistry

チリックらがよく用いるレドックスノンイノセント配位子 をもつニッケル錯体の一価種です。 Stanislav Groysman ,     Blake R Reed ,     Sebastian A Stoian  and   Richard L Lord    Chem. Commun. , 2015, Accepted Manuscript DOI:  10.1039/C5CC00203F Received 09 Jan 2015, Accepted 27 Jan 2015 First published online 27 Jan 2015 |  | Share on citeulike | Share on facebook | Share on twitter | |  More PDF Rich HTML    Send PDF to Kindle Download Citation BibTex   EndNote   MEDLINE   ProCite   ReferenceManager   RefWorks   RIS   Request Permissions Abstract Cited by Related Content   Reduction of bis(aldimino)pyridine nickel(II) dihalide forms a non-planar bis(aldimino)pyridine nickel(I) halide. Unlike the previously reported square-planar bis(ketimino)pyridine nickel chloride, for which the spin density was localized on the ligand, the present species demonstrate Npy-Ni-X angles of 156° – 162° and a significant spin density at the metal inferred from EPR meas

Justin T. Henthorn   ,  Sibo Lin   , and  Theodor Agapie   * Division of Chemistry and Chemical Engineering,  California Institute of Technology , 1200 East California Boulevard, MC 127-72, Pasadena, California 91125,  United States Abstract A series of π-bound Mo−quinonoid complexes supported by pendant phosphines have been synthesized. Structural characterization revealed strong metal–arene interactions between Mo and the π system of the quinonoid fragment. The Mo–catechol complex ( 2a ) was found to react within minutes with 0.5 equiv of O 2  to yield a Mo–quinone complex ( 3 ), H 2 O, and CO. Si- and B-protected Mo–catecholate complexes also react with O 2  to yield  3  along with (R 2 SiO) n  and (ArBO) 3  byproducts, respectively. Formally, the Mo–catecholate fragment provides two electrons, while the elements bound to the catecholate moiety act as acceptors for the O 2 oxygens. Unreactive by itself, the Mo–dimethyl catecholate analogue reduces O 2  in the presence

Biochemistry: Latest Articles (ACS ... by Yan Li, Miroslav Hodak and J. Bernholc  /  6h  //  keep unread  //  hide  //  preview   Biochemistry DOI: 10.1021/bi500776   Abstract Copper-containing nitrite reductases (CuNiRs) catalyze the reduction of nitrite to nitric oxide, a key step in the denitrification process that maintains balance between organic and inorganic nitrogen. Despite their importance, their functioning is not well understood. In this work, we carry out first-principles calculations and show that the available structural data are consistent only with a single mechanism. For this mechanism, we determine the activation energies, transition states, and minimum energy pathways of CuNiR. The calculations lead to an updated enzymatic mechanism and resolve several controversial issues. In particular, our work identifies the origins of the two protons necessary for the enzymatic function and shows that the transformation from the initi

Nature Communications  by Zoel Codolà  /   21h   //   keep unread   //   hide   //   preview Article Non-haeme iron complexes are known to be competent catalysts for chemically driven water oxidation. Here, the authors provide evidence for the formation of an inner-sphere iron(IV)- oxygen-cerium(IV) intermediate that may provide mechanistic insight into the naturally occurring oxygen evolving complex. Nature Communications  doi: 10.1038/ncomms6865 Authors: Zoel Codolà, Laura Gómez, Scott T. Kleespies, Lawrence Que Jr, Miquel Costas, Julio Lloret-Fillol Visit Website

Kentaro Mase   ,  Kei Ohkubo   , and  Shunichi Fukuzumi   * Department of Material and Life Science, Graduate School of Engineering, ALCA, Japan Science and Technology Agency (JST),  Osaka University , Suita, Osaka 565-0871,  Japan Abstract Effects of changes in the redox potential or configuration of cobalt chlorin derivatives (Co II (Ch n ) ( n  = 1–3)) on the catalytic mechanism and the activity of two-electron reduction of dioxygen (O 2 ) were investigated based on the detailed kinetic study by spectroscopic and electrochemical measurements. Nonsubstituted cobalt chlorin complex (Co II (Ch 1 )) efficiently and selectively catalyzed two-electron reduction of dioxygen (O 2 ) by a one-electron reductant (1,1′-dimethylferrocene) to produce hydrogen peroxide (H 2 O 2 ) in the presence of perchloric acid (HClO 4 ) in benzonitrile (PhCN) at 298 K. The detailed kinetic studies have revealed that the rate-determining step in the catalytic cycle is the proton-coupled electron t

ニッケル(III)アセテート錯体だそうです。 Tollmanが最近使っている配位子系ですね。 Paolo Pirovano 1 ,  Dr. Erik R. Farquhar 2 ,  Prof. Marcel Swart 3 ,  Anthony J. Fitzpatrick 4 ,  Dr. Grace G. Morgan 4  and Dr. Aidan R. McDonald 1,* View Full Article with Supporting Information (HTML)   Enhanced Article (HTML)   Get PDF (489K) Keywords: high-valent metals; metal–oxo species; nickel; oxidation catalysis; reactive intermediates Abstract High-valent terminal metal–oxygen adducts are hypothesized to be the potent oxidizing reactants in late transition metal oxidation catalysis. In particular, examples of high-valent terminal nickel–oxygen adducts are scarce, meaning there is a dearth in the understanding of such oxidants. A monoanionic Ni II -bicarbonate complex has been found to react in a 1:1 ratio with the one-electron oxidant tris(4-bromophenyl)ammoniumyl hexachloroantimonate, yielding a thermally unstable intermediate in high yield (ca. 95 %). Electronic absorption, electronic

RSC - Chem. Commun. latest articles by Arun Kumar Bar  Chem. Commun. , 2015, Accepted Manuscript DOI : 10.1039/C4CC10182K, Communication Arun Kumar Bar, Celine Pichon, Nayanmoni Gogoi, Carine Duhayon, s ramasesha, Jean-Pascal Sutter Supramolecular organization of a metal complex may significantly contribute to the magnetization dynamics of mononuclear SMMs. This is illustrated for a heptacoordinated Fe(II) complex with rather moderate Ising-type anisotropy for... The content of this RSS Feed (c) The Royal Society of Chemistry

Suvendu Maity   † ,  Suman Kundu   † ,  Amit Saha Roy   † ,  Thomas Weyhermüller   ‡ , and  Prasanta Ghosh   * † †  Department of Chemistry,  R. K. Mission Residential College , Narendrapur, Kolkata-103,  India ‡   Max-Planck-Institut für Chemische Energiekonversion , Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr,  Germany Inorg. Chem. , Article ASAP DOI:  10.1021/ic502320m Publication Date (Web): January 20, 2015 Copyright © 2015 American Chemical Society Synopsis Orthometalated derivatives of dibenzo[1,2]quinoxaline (DBQ) with ruthenium, osmium, and rhodium ions of types [M(DBQ)(PPh3)2(X)(Y)]0/+ are reported (M = RuII/III, OsII/III/IV, RhIII; X = Cl, Br; and Y = Cl, Br, CO). Reaction of [RuIII(DBQ)(PPh3)2Cl2] with NO gas affords an orthometalated [RuNO]6 derivative, [RuII(DBQ)(NO+)(PPh3)2Cl]Cl, which undergoes reduction at −0.65 V to a [RuNO]7 derivative, [Ru(DBQ)(NO)(PPh3)2Cl]. Abstract A new family of organometallics of ruthenium(II/III), osmium(II/

Manas Kumar Mondal , a      Abul Kalam Biswas , b    Bishwajit Ganguly * b  and     Chandan Mukherjee * a    Show Affiliations Dalton Trans. , 2015, Advance Article DOI:  10.1039/C4DT03263B Received 22 Oct 2014, Accepted 23 Dec 2014 First published online 24 Dec 2014 Two non-innocent 2-anilino-4,6-di- tert -butylphenol units were connected through an - ortho bridging S atom and provided the ligand  H 4 L S(AP/AP) . The ligand reacted with CuCl 2 ·2H 2 O in the presence of Et 3 N under air and generated a mononuclear Cu( II ) complex ( 1, [CuL S(IBQ/ISQ) Cl] 0 ). A single crystal X-ray diffraction analysis confirmed that in the complex one of the two 2-anilido-4,6-di- tert -butylphenol arms was present in its one-electron oxidized iminobenzosemiquinone form, while the other was in its two-electron oxidized iminobenzoquinone form. The monoradical-containing Cu( II ) complex was diamagnetic in nature owing to a strong antiferromagnetic coupling bet

Thomas M. Makris   † ¶ ,  Van V. Vu   ¶ ‡ ,  Katlyn K. Meier § ,  Anna J. Komor   ¶ ‡ ,  Brent S. Rivard   † ¶ ,  Eckard Münck   * § ,  Lawrence Que   ,  Jr. * ¶ ‡ , and  John D. Lipscomb   * † ¶ † Department of Biochemistry, Molecular Biology, and Biophysics,  ¶ Center for Metals in Biocatalysis, and  ‡ Department of Chemistry,  University of Minnesota , Minneapolis, Minnesota 55455,  United States §  Department of Chemistry,  Carnegie Mellon University , Pittsburgh, Pennsylvania 15213,  United States Abstract Streptomyces venezuelae  CmlI catalyzes the six-electron oxygenation of the arylamine precursor of chloramphenicol in a nonribosomal peptide synthetase (NRPS)-based pathway to yield the nitroaryl group of the antibiotic. Optical, EPR, and Mössbauer studies show that the enzyme contains a nonheme dinuclear iron cluster. Addition of O 2  to the diferrous state of the cluster results in an exceptionally long-lived intermediate ( t 1/2  = 3 h at 4 °C) that is assigne

Xue-Li He   ,  Yun-Ping Liu   ,  Kai-Ning Gong   ,  Zhan-Gang Han   * , and  Xue-Liang Zhai College of Chemistry & Material Science,  Hebei Normal University , Shijiazhuang, Hebei 050024,  China Synopsis A host−guest system of an arsenic−vanadium cluster is constructed and exhibits an efficient heterogeneous catalytic performance for the electron-transfer reduction of CrVI using formic acid at ambient temperature. Abstract Polyanionic cluster [β-As 8 V 14 O 42 (H 2 O)] 4–  is well embedded in a large porous eight-membered cationic ring of the copper ligand, giving a stable host–guest supramolecular system. The assembly exhibits an efficient heterogeneous catalytic performance for the reduction of Cr VI using formic acid at ambient temperature.