Three’s company: Iron(I) hydride complexes are presented (see picture; N blue, O red) that are the first monomeric open-shell hydride complexes to be crystallographically verified as being three-coordinate at the metal. Backbonding into diketiminate π* orbitals stabilizes the low oxidation state. The FeH bonding has been analyzed using electron-nuclear double resonance (ENDOR).
Tuesday, February 28, 2012
Characterization of the FeH Bond in a Three-Coordinate Terminal Hydride Complex of Iron(I)
Monday, February 27, 2012
Unsensitized PhotochemicalHydrogen Production Catalyzedby Diiron Hydrides
Hydrogen Production Catalyzed
by Diiron Hydrides:
Thursday, February 23, 2012
Hydrogenases and oxygen
DOI: 10.1039/C2SC01112C, Perspective
We summarize the current picture of oxygen-induced inhibition of the different classes of hydrogenases and discuss possible avenues that might lead to tailored oxygen-robust enzyme variants.
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Wednesday, February 22, 2012
Synthesis, Reactivity, and Catalytic Application of a Nickel Pincer Hydride Complex
and Catalytic Application of
a Nickel Pincer Hydride Complex:
Electronic structures of methylated azaferrocenes and their borane adducts: Photoelectron spectroscopy and electronic structure calculations
DOI: 10.1039/C2DT12237E, Paper
Azaferrocenes, borane adducts, photoelectron spectroscopy.
Synthesis, structure, and physical properties for a series of trigonal bipyramidal MII-Cl complexes with intramolecular hydrogen bonds
DOI: 10.1039/C2DT12244H, Paper
The tripodal ligand tris(2-amino-oxazoline)amine stabilizes a series of monomeric MII-Cl complexes.
Tuesday, February 21, 2012
Access to catenated and branched polyphosphorus ligands and coordination complexes via a tri(pyrazolyl)phosphane
We report a high yielding, one-pot synthesis of a tri- and an iso-tetraphosphane from a readily accessible tri(pyrazolyl)phosphane. Their potential as ligands has been shown in complexes with the Fe(CO)4-fragment.
Efficient dynamic kinetic resolution of racemic secondary alcohols by a chemoenzymatic system using bifunctional iridium complexes with C-N chelate amido ligands
DOI: 10.1039/C2CC30333G, Communication
The combined catalyst system of bifunctional amidoiridium complexes derived from benzylic amines with CALB was found to provide a range of chiral acetates from racemic secondary alcohols in excellent yields...
Thursday, February 16, 2012
Dehydrogenative Oxidationof Alcohols in Aqueous MediaUsing Water-Soluble and Reusable Cp*Ir Catalysts Bearing a FunctionalBipyridine Ligand
of Alcohols in Aqueous Media
Using Water-Soluble and Reusable Cp*Ir Catalysts Bearing a Functional
Bipyridine Ligand:
Wednesday, February 15, 2012
Dioxygen Reactivity of New Bispidine-Copper Complexes
New Bispidine-Copper Complexes:
Tuesday, February 14, 2012
Reversible Electrocatalytic Production and Oxidation of Hydrogen at Low Overpotentials by a Functional Hydrogenase Mimic
An efficient ligand combination: A new bis(diphosphine) nickel(II) complex (see picture) is described. A ΔG° value of 0.84 kcal mol−1 for hydrogen addition for this complex was calculated from the experimentally determined equilibrium constant. This complex displayed a reversible electrocatalytic activity for hydrogen production and oxidation at low overpotentials, which are characteristic for hydrogenase enzymes.
Monday, February 13, 2012
Oxidative Addition Reactions of Bis-Aminophosphine and Bis-Phosphinite Nickel(0) Pincer Complexes
of Bis-Aminophosphine
and Bis-Phosphinite Nickel(0) Pincer Complexes:
Rhenium(V) and Technetium(V) Nitrido Complexes with Mixed Tridentate π-Donor and Monodentate π-Acceptor Ligands
Nitrido Complexes with
Mixed Tridentate π-Donor and Monodentate π-Acceptor Ligands:
Novel access to carbodiphosphoranes in the coordination sphere of group 10 metals: template synthesis and protonation of PCP pincer carbodiphosphorane complexes of C(dppm)2
The pincer carbodiphosphorane complexes [M(Cl)(C(dppm)2-[small kappa]3P,C,P)]Cl are synthesized from MCl2, dppm and CS2 as the source of the central CDP carbon.
Highly active zinc alkyl cations for the controlled and immortal ring-opening polymerization of [varepsilon]-caprolactone
DOI: 10.1039/C2DT12336C, Communication
Novel zinc cations are highly active in the immortal ROP of [varepsilon]-caprolactone to yield narrowly disperse and chain-length-controlled poly([varepsilon]-caprolactone), whether in solution or bulk polymerization.
Tuning redox potentials of bis(imino)pyridine cobalt complexes: an experimental and theoretical study involving solvent and ligand effects
DOI: 10.1039/C2DT12195F, Paper C. Moyses Araujo, Mark D. Doherty, Steven J. Konezny, Oana R. Luca, Alex Usyatinsky, Hans Grade, Emil Lobkovsky, Grigorii L. Soloveichik, Robert H. Crabtree, Victor S. Batista
The Structure and Chemistry of Tris(pentafluorophenyl)borane Protected Mononuclear Nitridotitanium Complexes
DOI: 10.1039/C2DT00056C, Paper
Wednesday, February 8, 2012
Electrochemical and Theoretical Studies of the Impact of the Chelating Ligand on the Reactivity of [Fe2(CO)4(κ2-LL)(μ-pdt)]+ Complexes with Different Substrates (LL = IMe-CH2-IMe, dppe; IMe = 1-Methylimidazol-2-ylidene)
Dinickel(II) complexes: Preparation and catalytic activity
A series of dinuclear nickel(II) complexes have been synthesized and characterized. These complexes appear to be efficient catalysts for the homo-coupling of terminal alkynes with molecular oxygen as the oxidant under mild conditions.
Synthesis and characterization of cobalt(II) complexes with tripodal polypyridine ligand bearing pivalamide groups. Selective formation of six- and seven-coordinate cobalt(II) complexes
Formation of six- and seven-coordinate cobalt(II) complexes has been selectively controlled by the coordinating ability and bulkiness of anions.
Tandem Rhodium-Catalyzed Hydroformylation–Hydrogenation of Alkenes by Employing a Cooperative Ligand System
Dual action: A multifunctional rhodium catalyst system enables the simultaneous catalysis of two distinct transformations, hydroformylation of an alkene and reduction of an aldehyde, in a highly selective manner. This one-pot/two-step process is controlled by the cooperative action of two different supramolecular ligand systems and transforms terminal alkenes into C1-chain-elongated linear alcohols.
Covalent Hybrid of Spinel Manganese–Cobalt Oxide and Graphene as Advanced Oxygen Reduction Electrocatalysts
Manganese–Cobalt
Oxide and Graphene as Advanced Oxygen Reduction Electrocatalysts:
A copper thiolate centre for electron transfer: mononuclear vs. dinuclear complexes
DOI: 10.1039/C2DT12355J, Communication
A rare mononuclear alkyldithiolate CuII complex characterized by a reversible CuII/CuI redox couple, compared with its bis([small mu ]-thiolato) dicopper parent complex.
Super reduced Fe4S4 cluster of Balch's dithiolene series
DOI: 10.1039/C2DT12184K, Paper
A super reduced Fe4S4 cluster with a sulfur based radical (1) which evolves H2S on treatment with acid under ambient conditions has been synthesized and characterized. The EPR spectrum of 1 resembles the CO inhibited, reduced Fe-S cluster of Clostridium pasteurianum W5 hydrogenase and the Fe4S4 center of the wild-type enzyme, IspH treated with HMBPP or IPP.
Tuesday, February 7, 2012
Monday, February 6, 2012
Biosynthesis of the Iron-Guanylylpyridinol Cofactor of [Fe]-Hydrogenase in Methanogenic Archaea as Elucidated by Stable-Isotope Labeling
Cofactor
of [Fe]-Hydrogenase in Methanogenic Archaea as Elucidated by Stable-Isotope
Labeling:
Electrocatalytic Hydrogen Evolution in Acidic Water with Molecular Cobalt Tetraazamacrocycles
Evolution in Acidic Water
with Molecular Cobalt Tetraazamacrocycles:
Thursday, February 2, 2012
Reversible formal insertion of CO2 into a remote C-H bond of ligand in a Ru(II) complex at room temperature
DOI: 10.1039/C2CC17933D, Communication
A reversible formal insertion of CO2 into a remote C-H bond of the diazafluorenide ligand (L-) in a Ru(II) complex which occurs at ambient temperature.