Tuesday, February 28, 2012

Characterization of the Fe[BOND]H Bond in a Three-Coordinate Terminal Hydride Complex of Iron(I)

Characterization of the Fe<img src="http://onlinelibrarystatic.wiley.com/undisplayable_characters/00f8ff.gif" alt="[BOND]">H Bond in a Three-Coordinate Terminal Hydride Complex of Iron(I): Thumbnail image of graphical abstract

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 Fe[BOND]H bonding has been analyzed using electron-nuclear double resonance (ENDOR).

Thursday, February 23, 2012

Hydrogenases and oxygen

Hydrogenases and oxygen:

Chem. Sci., 2012, Advance Article
DOI: 10.1039/C2SC01112C, Perspective
Martin Tillmann Stiebritz, Markus Reiher
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

Synthesis, Reactivity,
and Catalytic Application of
a Nickel Pincer Hydride Complex
:

TOC Graphic

Organometallics DOI: 10.1021/om201279j
Xile Hu

Electronic structures of methylated azaferrocenes and their borane adducts: Photoelectron spectroscopy and electronic structure calculations

Electronic structures of methylated azaferrocenes and their borane adducts: Photoelectron spectroscopy and electronic structure calculations:

Dalton Trans., 2012, Advance Article
DOI: 10.1039/C2DT12237E, Paper
Tim J. Brunker, Branka Kovac, Konrad Kowalski, Walther Polit, Rainer F. Winter, Arnold L. Rheingold, Igor Novak
Azaferrocenes, borane adducts, photoelectron spectroscopy.

Synthesis, structure, and physical properties for a series of trigonal bipyramidal MII-Cl complexes with intramolecular hydrogen bonds

Synthesis, structure, and physical properties for a series of trigonal bipyramidal MII-Cl complexes with intramolecular hydrogen bonds:

Dalton Trans., 2012, Advance Article
DOI: 10.1039/C2DT12244H, Paper
Nathaniel S. Sickerman, Young Jun Park, Gary K.-Y. Ng, Jefferson E. Bates, Mark Hilkert, Joseph W. Ziller, Filipp Furche, A. S. Borovik
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

Access to catenated and branched polyphosphorus ligands and coordination complexes via a tri(pyrazolyl)phosphane:

Chem. Commun., 2012, Advance Article DOI: 10.1039/C2CC18030H, Communication
Kai-Oliver Feldmann, Roland Frohlich, Jan J. Weigand
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

Efficient dynamic kinetic resolution of racemic secondary alcohols by a chemoenzymatic system using bifunctional iridium complexes with C-N chelate amido ligands:
Chem. Commun., 2012, Accepted Manuscript
DOI: 10.1039/C2CC30333G, Communication
Yasuhiro Sato, Yoshihito Kayaki, Takao Ikariya
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...

Tuesday, February 14, 2012

Reversible Electrocatalytic Production and Oxidation of Hydrogen at Low Overpotentials by a Functional Hydrogenase Mimic

Reversible Electrocatalytic Production and Oxidation of Hydrogen at Low Overpotentials by a Functional Hydrogenase Mimic: Thumbnail image of graphical abstract

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

Oxidative Addition Reactions
of Bis-Aminophosphine
and Bis-Phosphinite Nickel(0) Pincer Complexes
:

TOC Graphic

Organometallics DOI: 10.1021/om201229x
Doug Stephan

Aerobic CO Oxidation of a Metal-Bound Carbonyl in a NHC-Stabilized Cobalt Half-Sandwich Complex

Aerobic CO Oxidation of
a Metal-Bound Carbonyl in
a NHC-Stabilized Cobalt Half-Sandwich Complex
:

TOC Graphic

Organometallics DOI: 10.1021/om201037w

Rhenium(V) and Technetium(V) Nitrido Complexes with Mixed Tridentate π-Donor and Monodentate π-Acceptor Ligands

Rhenium(V) and Technetium(V)
Nitrido Complexes with
Mixed Tridentate π-Donor and Monodentate π-Acceptor Ligands
:

TOC Graphic

Inorganic Chemistry DOI: 10.1021/ic202605z

suitable ligand for Ni-Fe models?

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

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:

Dalton Trans., 2012, Advance Article DOI: 10.1039/C2DT11949H, Paper
Christian Reitsamer, Silvia Stallinger, Walter Schuh, Holger Kopacka, Klaus Wurst, Dagmar Obendorf, Paul Peringer
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.

Pincers seem to help CO2 fixation

Highly active zinc alkyl cations for the controlled and immortal ring-opening polymerization of [varepsilon]-caprolactone

Highly active zinc alkyl cations for the controlled and immortal ring-opening polymerization of [varepsilon]-caprolactone:

Dalton Trans., 2012, Advance Article
DOI: 10.1039/C2DT12336C, Communication
Charles Romain, Vitor Rosa, Christophe Fliedel, Frederic Bier, Frederic Hild, Richard Welter, Samuel Dagorne, Teresa Aviles
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.

NIL on Zn

Tuning redox potentials of bis(imino)pyridine cobalt complexes: an experimental and theoretical study involving solvent and ligand effects

Tuning redox potentials of bis(imino)pyridine cobalt complexes: an experimental and theoretical study involving solvent and ligand effects:

Dalton Trans., 2012, Advance Article
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
CV measurements and DFT/B3LYP calculations show that in solution a series of (NNN)CoCl2 complexes exist in equilibrium with [(NNN)2Co][CoCl4] which exhibit CoII/III oxidation potentials spanning nearly 750 mV in acetonitrile.

The Structure and Chemistry of Tris(pentafluorophenyl)borane Protected Mononuclear Nitridotitanium Complexes

The Structure and Chemistry of Tris(pentafluorophenyl)borane Protected Mononuclear Nitridotitanium Complexes:
Dalton Trans., 2012, Accepted Manuscript
DOI: 10.1039/C2DT00056C, Paper
Anna-Marie Fuller, David L. Hughes, Garth Jones, Simon J Lancaster

Presumably MN-B(ArF)3

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)

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)
:

TOC Graphic

OrganometallicsDOI: 10.1021/om201143p

Dinickel(II) complexes: Preparation and catalytic activity

Dinickel(II) complexes: Preparation and catalytic activity:

Dalton Trans., 2012, Advance Article DOI: 10.1039/C2DT11398H, Paper
Ting-Peng Cheng, Bei-Sih Liao, Yi-Hung Liu, Shie-Ming Peng, Shiuh-Tzung Liu
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

Synthesis and characterization of cobalt(II) complexes with tripodal polypyridine ligand bearing pivalamide groups. Selective formation of six- and seven-coordinate cobalt(II) complexes:

Dalton Trans., 2012, Advance Article DOI: 10.1039/C2DT12056A, Paper
Jun Matsumoto, Tatsuya Suzuki, Yuji Kajita, Hideki Masuda
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

Tandem Rhodium-Catalyzed Hydroformylation–Hydrogenation of Alkenes by Employing a Cooperative Ligand System: Thumbnail image of graphical abstract

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

Covalent Hybrid of Spinel
Manganese–Cobalt
Oxide and Graphene as Advanced Oxygen Reduction Electrocatalysts
:

TOC Graphic

Journal of the American Chemical Society
DOI: 10.1021/ja210924t

A copper thiolate centre for electron transfer: mononuclear vs. dinuclear complexes

A copper thiolate centre for electron transfer: mononuclear vs. dinuclear complexes:


Dalton Trans., 2012, Advance Article
DOI: 10.1039/C2DT12355J, Communication

Marcello Gennari, Jacques Pecaut, Marie-Noelle Collomb, Carole Duboc

A rare mononuclear alkyldithiolate CuII complex characterized by a reversible CuII/CuI redox couple, compared with its bis([small mu ]-thiolato) dicopper parent complex.

RA: This is one of my dream ligand systems which gives a nice tetrahedral twist when needed and gives high stability to the formed complex due to the chelation. Diphenyl groups attached and the inability to make a complete tetrahedral geometry made this wonderful Cu(II)-bisthiolate complex possible. This is one of the rarest examples of this kind.

Super reduced Fe4S4 cluster of Balch's dithiolene series

Super reduced Fe4S4 cluster of Balch's dithiolene series:


Dalton Trans., 2012, Advance Article
DOI: 10.1039/C2DT12184K, Paper

Ameerunisha Begum, Golam Moula, Moumita Bose, Sabyasachi Sarkar

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.

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

Reversible formal insertion of CO2 into a remote C-H bond of ligand in a Ru(II) complex at room temperature:

Chem. Commun., 2012, Accepted Manuscript

DOI: 10.1039/C2CC17933D, Communication
Vincent T. Annibale, Datong Song

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.