نتایج جستجو برای: pentadentate ligand

تعداد نتایج: 107599  

Journal: :Chemical science 2013
Dong Wang Kallol Ray Michael J Collins Erik R Farquhar Jonathan R Frisch Laura Gómez Timothy A Jackson Marion Kerscher Arkadius Waleska Peter Comba Miquel Costas Lawrence Que

Oxoiron(IV) species have been found to act as the oxidants in the catalytic cycles of several mononuclear nonheme iron enzymes that activate dioxygen. To gain insight into the factors that govern the oxidative reactivity of such complexes, a series of five synthetic S = 1 [Fe(IV)(O)(L(N5))](2+) complexes has been characterized with respect to their spectroscopic and electrochemical properties a...

Journal: :Dalton transactions 2011
Tyler J Morin Sarath Wanniarachchi Chengeto Gwengo Vitales Makura Heidi M Tatlock Sergey V Lindeman Brian Bennett Gary J Long Fernande Grandjean James R Gardinier

A series of iron(II) chloride complexes of pentadentate ligands related to α,α,α',α'-tetra(pyrazolyl)-2,6-lutidine, pz(4)lut, has been prepared to evaluate whether pyrazolyl substitution has any systematic impact on the electronic properties of the complexes. For this purpose, the new tetrakis(3,4,5-trimethylpyrazolyl)lutidine ligand, pz**(4)lut, was prepared via a CoCl(2)-catalyzed rearrangeme...

1999
Sudeep Bhattacharyya Dipesh Ghosh Akira Endo Kunio Shimizu Timothy J. R. Weakley

In the presence of some hydroxylated compounds as substrates, complexations of nickel() with the pentadentate N4S ligand methyl 2-{2-bis[(3,5-dimethylpyrazol-1-ylmethyl)amino]propylamino}cyclopent-1-ene-1-carbodithioate (Hmmpcd) having a pair of flexible pyrazolyl arms proceeded through unusual reaction paths involving C–N bond cleavage process. For example, the product 1 obtained in methanol...

Journal: :Dalton transactions 2015
Nicole Kroll Kolja Theilacker Marc Schoknecht Dirk Baabe Dennis Wiedemann Martin Kaupp Andreas Grohmann Gerald Hörner

The ligand-field strength in metal complexes of polydentate ligands depends critically on how the ligand backbone places the donor atoms in three-dimensional space. Distortions from regular coordination geometries are often observed. In this work, we study the isolated effect of ligand-sphere distortion by means of two structurally related pentadentate ligands of identical donor set, in the sol...

Journal: :Inorganic chemistry 2014
Amanda E King Michael Nippe Mihail Atanasov Teera Chantarojsiri Curtis A Wray Eckhard Bill Frank Neese Jeffrey R Long Christopher J Chang

The ubiquity of vanadium oxo complexes in the V+ and IV+ oxidation states has contributed to a comprehensive understanding of their electronic structure and reactivity. However, despite being predicted to be stable by ligand-field theory, the isolation and characterization of a well-defined terminal mononuclear vanadium(III) oxo complex has remained elusive. We present the synthesis and charact...

Journal: :Inorganic chemistry 2015
Donald G Jones Kevin R Wilson Desiray J Cannon-Smith Anthony D Shircliff Zhan Zhang Zhuqi Chen Timothy J Prior Guochuan Yin Timothy J Hubin

The first 2-pyridylmethyl pendant-armed ethylene cross-bridged cyclam ligand has been synthesized and successfully complexed to Mn(2+), Fe(2+), Co(2+), Ni(2+), Cu(2+), and Zn(2+) cations. X-ray crystal structures were obtained for all six complexes and demonstrate pentadentate binding of the ligand with the requisite cis-V configuration of the cross-bridged cyclam ring in all cases, leaving a p...

Journal: :Dalton transactions 2009
Elky Almaraz Jason A Denny William S Foley Joseph H Reibenspies Nattamai Bhuvanesh Marcetta Y Darensbourg

To explore the displacement of Zn(2+) by Ni(2+) from within N-, S-, and O-chelate ligands, (N-(3-thiabutyl)-N'-(3-thiapentaneoate)-1,4-diazacycloheptane)zinc(II), Zn-1'-Ac, and 1,4-diazacycloheptane-1,4-diylbis(3-thiapentanoato) zinc(II), Zn-1'-Ac(2), were reacted with Ni(BF(4))(2) in a methanol solution and were found to yield, in both cases, the bright blue, hexa-coordinate Ni-1'-Ac(2) metal-...

2014
Sumit Sahu Matthew G. Quesne Casey G. Davies Maximilian Dürr Ivana Ivanović-Burmazović Maxime A. Siegler Guy N. L. Jameson Sam P. de Visser David P. Goldberg

The synthesis of a pentadentate ligand with strategically designed fluorinated arene groups in the second coordination sphere of a nonheme iron center is reported. The oxidatively resistant fluorine substituents allow for the trapping and characterization of an Fe(IV)(O) complex at -20 °C. Upon warming of the Fe(IV)(O) complex, an unprecedented arene C-F hydroxylation reaction occurs. Computati...

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