Download or read book Divalent Metal Complexes of Novel Tripodal Ligands written by Magdalena M. Makowska-Grzyska and published by . This book was released on 2003 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Divalent Transition metal Complexes of Novel Hexadentate Ligands Based on Cis Cis 1 3 5 triaminocyclohexane written by Neng Ye and published by . This book was released on 2001 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Tripodal Ligands for Novel Transition Metals Complexes written by David James Harding and published by . This book was released on 2005 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metal Complexes of a New Tripodal Multidentate Ligand written by Getinet Tamiru Tigineh and published by LAP Lambert Academic Publishing. This book was released on 2012-03-01 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal complexes are species consisting of metal coordinated with one or more ligands, they are important in catalysis, materials synthesis, photochemistry, biological Systems and so on .Moreover these metal complexes display diverse chemical, optical and magnetic properties which are significant for different applications. This monograph contains an attempt has been made to synthesize a new tipodal multidentae ligand containing S-Triazine function capable of holding metal ions through possible coordination center with alternative path of preparation and to search metal ions which are capable of coordinated in these available sites. Based on the analytical, spectral (i.e NMR, IR, UV), magnetic susceptibility and conductance data it is proposed that the ligand employs one or more ONN sequence in metal binding process. Precisely, the Ni(II) complex involves bonding through one ONN sequence and the Zn(II) complex has bonding through three such sequences. As such TSHSTZ behaves as a dibasic ONN donor towards Ni(II) and tri basic tris-ONN donor towards Zn(II) with the preference of Octahedral and Tetrahedral geometries respectively.

Download or read book Transition Metal Complexes of Neutral eta1 Carbon Ligands written by Remi Chauvin and published by Springer. This book was released on 2009-12-18 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: Yves Canac and Remi Chauvin: Neutral eta1-carbon ligands: beyond carbon monoxide; Esteban P. Urriolabeitia: Ylide Ligands; Wolfgang Petz and Gernot Frenking: Carbodiphosphoranes and related ligands; Mareike C. Jahnke and F. Ekkehardt Hahn: Chemistry of N-Heterocyclic Carbene Ligands; Tsuyoshi Kato, Eddy Maerten, Antoine Baceiredo: Non-NHCs stable singlet carbene ligands; Victorio Cadierno, Sergio E. García-Garrido: All-Carbon-Substituted Allenylidene and Related Cumulenylidene Ligands; Victorio Cadierno, Sergio E. García-Garrido: Heteroatom-Conjugated Allenylidene and Related Cumulenylidene Ligands.

Download or read book Main Group and Transition Metal Complexes Supported by Multidentate Tripodal Ligands that Feature Nitrogen Oxygen and Sulfur Donors written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 5 describes two multidentate, L3X type ligands, which feature [CN3] and [CNO2] donors, namely tris(2 pyridylseleno)methane, [Tpsem]H, and bis(2-pyridonyl)(pyridin-2-yloxy)methane, [O-poBpom]H. They have been synthesized, characterized, and employed in the synthesis of zinc and cadmium complexes. Chapter 6 describes the synthesis and structural characterization of a new [Tp] ligand featuring an allyl substituent on the central boron atom, namely [allylTpBut]Li is reported. The compound reacts steadily with CH3CH2SH under 350 nm UV light via a thiol-ene click reaction. The resulting [CH3CH2S(CH2)3TpBut]Li complex can further react with metal halide. For example, the reaction of [CH3CH2S(CH2)3TpBut]Li with ZnI2 produced [CH3CH2S(CH2)3TpBut]ZnI at room temperature. This study provides a simple model on the immobilization of [Tp] metal complexes to the polymer chains with -SH terminals.

Download or read book Divalent Transition Metal Complexes Supported by Sterically Demanding Amido Ligands written by Ho Yu Au Yeung and published by . This book was released on 2006 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monometallic and Bimetallic Complexes with Sulfonamido Based Tripodal Ligands written by Nathanael Lau and published by . This book was released on 2017 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: A central tenet of chemistry is the importance of the local environments that surround molecules. Rules for how such local environments control molecular properties have been developed and form the basis for coordination chemistry, an area of chemistry devoted to the study of molecules containing metal ions. Within this context, the volume of space surrounding metal ions is divided into two regions, referred to as the primary and secondary coordination spheres. The primary coordination sphere involves covalent interactions between atoms on ligands that are directly bound to the metal center. The secondary coordination sphere, which involves non-covalent interactions, is part of the volume of space around the metal center and often interacts with the ligands of the primary coordination sphere. Together, the coordination spheres define the physical properties and reactivity of a metal ion. The importance of modulating both is seen within the active sites of metalloproteins, in which the interplay between the two coordination spheres allow these proteins to catalyze difficult reactions under ambient conditions, with selectivities and efficiencies that are currently unattainable in synthetic systems.One approach towards understanding how the two coordination spheres affect function involves specially designed ligands that account for effects in both coordination spheres. The aim of this dissertation is to study synthetic metal complexes that incorporate these types of ligands, and explore their fundamental physical, structural, and chemical properties. The ligands used are based on the tripodal sulfonamido-based ligand N,N',N"-[2,2',2"-nitrilotris(ethane-2,1-diyl)]tris(2,4,6-trimethylbenzenesulfonamido) ([MST]3--). This ligand contains a tris(2-aminoethyl)amine (tren) backbone that allows for the preparation of four- or five-coordinate metal complexes with local C3 symmetry to control the primary coordination sphere. The trigonal environment leads to high-spin metal complexes, and the presence of three anionic nitrogen donors helps to stabilize relatively high oxidation states. Secondary coordination sphere effects are modulated through the sulfonamido moieties. The [MST]3-- ligand can support monometallic metal complexes with terminal hydroxido, aqua, or ammine ligands, as the sulfonamido moieties can accept H-bonds from H-atom containing exogenous ligands. Additionally, the sulfonamido O-atoms can serve as a secondary metal binding site, allowing discrete bimetallic complexes to be prepared with [MST] 3--.In this dissertation, new monometallic and bimetallic complexes with sulfonamido-based tripodal ligands were prepared, with the goal of understanding how the choice of ligands influences the properties of metal complexes. The first study investigated the effect of ligand modification on the physical properties of a series of FeII--OH2 complexes supported by ligands related to [MST]3--. The aryl groups of the five new N,N',N"-[2,2',2"-nitrilotris(ethane-2,1-diyl)]-tris-({R-Ph}-sulfonamido)) ([RST]3--) ligands had para-substituents of varying electron-withdrawing and donating strengths. The physical properties of the subsequent Fe II--OH2 complexes were probed by various characterization methods, which revealed that the greatest impact of the ligand modification occurred in the metal complexes' electrochemical properties.Monometallic Ni complexes with [MST]3-- and a related urea-based ligand, [H3buea]3--, were then studied. The solid-state structures of these compounds showed that these ligands allowed for the preparation of NiII complexes with terminal aqua or hydroxido ligands in distorted trigonal bipyramidal geometries. Additionally, the oxidation chemistry of both NiII compounds was investigated, allowing for the preparation and characterization of uncommon NiII I complexes.Bimetallic complexes with [MST]3-- are prepared by treating a solution of a monometallic [MST]3-- complex, secondary metal salt, and secondary multidentate ligand with O2. The secondary ligand serves to "cap" the secondary metal center, resulting in discretely bimetallic units. A new series of bimetallic complexes with FeII(OH)FeIII, CoII(OH)Fe III, and NiII(OH)FeIII cores was prepared, using the bidentate capping ligand tetramethylethylenediamine (TMEDA). Previously, all other capping ligands used in this system had denticities of three and above. The bidentate capping ligand TMEDA allows the previously outer-sphere trifluoromethansulfonate (OTf--) counter anion to become inner-sphere, occupying the sixth coordination site of the second metal center.

Download or read book Synthesis and Reactivity of Divalent Transition Metal Complexes Supported by Arylamido Ligands written by Fai George Wong and published by . This book was released on 2008 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metal Complexes of Tripodal N heterocyclic Carbene Ligands written by Xile Hu and published by . This book was released on 2004 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metal Ligand Multiple Bonds written by William A. Nugent and published by Wiley-Interscience. This book was released on 1988-11-14 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only comprehensive one-volume text/reference on metal-ligand multiple bonds. Stresses the unified nature of the field and includes handy new tabulations of data. The flow within each subtopic is oxygen to nitrogen to carbon. Coverage is up-to-date--virtually every subtopic leads to interesting questions for future research. Presents information otherwise scattered through hundreds of publications.

Download or read book Novel Tripodal Ligands Designed to Complex Anions written by Peter K. Hopkins and published by . This book was released on 1999 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lanthanide and Transition Metal Complexes of Novel Schiff Base Ligands written by Khalil Khalaf Abid and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Novel Triazole based Ligands and Metal Complexes written by Elana Slutsky Smith and published by . This book was released on 2012 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthetic Investigations of Transition Metal Complexes Featuring New Tripodal Ancillary Ligands written by Laura I. Turculet and published by . This book was released on 2003 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Structures and Reactivities of Group 12 Metal Complexes Coordinated by Tripodal Nitrogen sulfur Ligands Possessing Internal Hydrogen Bond Donors written by Russell Ammon Allred and published by . This book was released on 2003 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Peptide type Tripodal Ligands and Their Metal Complexes written by Ágnes Dancs and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most important directions of modern bioinorganic research is the development of artificial enzymes. One pathway of enzyme modeling strategy is the study of amino acid sequences present in the active centers of metalloenzymes. Linear peptides, however, have their limitations in reconstituting the active centers of metalloenzymes, since they do not possess the well-defined three dimensional structure, therefore their structure is vulnerable towards amide nitrogen coordination/hydrolysis. Improvement of metal binding capabilities of linear peptides can be obtained by e.g. their functionalization with tripodal ligands. Tripodal compounds may provide a rigid, less flexible platform for the coordinating amino acid side chains, creating pre-organized metal binding sites. In my thesis, I present synthesis and characterization of histidine containing tripodal peptide ligands and their complex formation in presence of copper(II) and zinc(II). Solution equilibrium was studied with pH potentiometric measurements, and several spectroscopic methods were used for structural characterization (UV-Vis, CD, ESR, NMR and MS methods). Beside thermodynamic and structural characterization, enzyme mimicking catalytical properties of the complexes have also been investigated (catechol oxidation, superoxide dismutation). Our results demonstrated that tripodal peptide ligands are capable of enhancing the stability of metal-peptide complexes, and they may provide convenient structures to efficiently mimic the catalytic functions of enzymes. With thorough and systematical solution equilibrium and spectroscopic studies, we uncovered the driving forces of metal coordination, and established the impact of the tripodal structure in stability, structure and catalytic properties of the forming complexes. Our findings confirm the beneficial effect of tripodal scaffolds in peptide-type ligand-metal complexes, and emphasize the possibilities lying within tripodal peptides in the field of enzyme mimicking.