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 Main Group and Transition Metal Complexes Supported by Carbon Sulfur and Selenium Donor Ligands written by Patrick Quinlivan and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: For example, a mixture of [TmBut]ZnMe and Me2Cd form an equilibrium mixture with [TmBut]CdMe and Me2Zn. Furthermore, transfer of the [TmBut] ligand between the metal centers is possible too. This is demonstrated by the transfer of [TmBut] from mercury to zinc in the methyl system, [TmBut]HgMe/Me2Zn. Additionally, transfer of [TmBut] from zinc to mercury is also observed upon treatment of [TmBut]2Zn with HgI2 to afford [TmBut]HgI and [TmBut]ZnI, thereby indicating that the nature of the co-ligand has a profound effect on the thermodynamics of ligand exchange. Chapter 3 explores the coordination chemistry of the selenium donor ligand, H(sebenzimMe). H(sebenzimMe) is able to coordinate metal centers through the selenium atom in a dative fashion, and, depending upon the metal center, up to four H(sebenzimMe) ligands can coordinate the same metal. Additionally, H(sebenzimMe) can be deprotonated to form [sebenzimMe]–, allowing for the potential of an LX coordination mode, which results in bridging complexes for the metal compounds investigated.

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 The Structure of Transition Metal Complexes of Multidentate Ligands Having Group V Donor Atoms written by Thomas Robert Dick and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies of Low Valent Main Group and Transition Metal Complexes Supported by Nitrogen based Ligands written by Audra Faye Lugo and published by . This book was released on 2009 with total page 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 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 Comprehensive Coordination Chemistry II Transition metal groups 7 and 8 written by Jon A. McCleverty and published by Pergamon. This book was released on 2004 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transition Metal Complexes with Multidentate Phosphorous nitrogen Ligands Synthesis Characterization and Reactivity written by Sergio Santiago Rozenel and published by . This book was released on 2011 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract Transition metal complexes with multidentate phosphorous/nitrogen ligands. Synthesis, characterization and reactivity. By Sergio Santiago Rozenel Doctor in Philosophy in Chemistry University of California, Berkeley Professor John Arnold, Chair Chapter 1: Chromium complexes supported by the multidentate monoanionic ligand [N2P2] {H[N2P2] = tBuN(H)SiMe2N(CH2CH2PiPr2)2} are presented, and the activity of these complexes towards ethylene oligomerization/polymerization is examined. The complexes [N2P2]CrCl2 (1) and [N2P2]CrCl (2) polymerized ethylene after activation with MAO. Derivatives of 1 and 2 were synthesized in order to gain insights about the active species in the ethylene oligomerization/polymerization processes. The alkyl complexes [N2P2]CrMe (3), [N2P2]CrCH2SiMe3 (4) and [N2P2]Cr(Cl)CH2SiMe3 (5), the cationic species {[N2P2]CrCl}BF4 (7), {[N2P2]CrCl}BPh4 (8) and {[N2P2]CrCH2SiMe3}BF4 (9), and the Cr(II) complex [N2P2]CrOSO2CF3 (11) were not active ethylene oligomerization/polymerization catalysts in absence of an activator. Reaction of 1 with two equivalents of MeLi led to reduction to 3. However, with one equivalent of MeLi the stable mixed alkyl-halide derivative [N2P2]Cr(Cl)Me (6) was obtained. Reaction of 2 with Red-Al® produced the hydride ([N2P2]Cr)2(ì-H)2 (10), which reacted with CO to produce the Cr(I) complex [N2P2]Cr(CO)2 (12). Reduction of 2 with KC8 in the presence of p-tolyl azide produced the dimeric cis μ-imido ([N2P2]Cr)2(ì-NC7H7)2 (13). A similar reduction in the presence of ethylene resulted in the isolation of the Cr(III) metallacyclohexane compound [N2P2]CrC4H8 (14). Chapter 2: A series of Co, Ni and Cu complexes with the ligand HN(CH2CH2PiPr2)2 (HPNP) has been isolated and their electrochemical behavior investigated by cyclic voltammetry. The nickel complexes [(HPNP¬)NiOTf]OTf and [(HPNP)NiNCCH3](BF4)2 display reversible reductions, as does the related amide derivative (NP2)NiBr. Related copper(I) and cobalt(II) derivatives were isolated and characterized. Addition of piperidine to [(HNP2)NiNCCH3](BF4)2 led to the formation of the new species [(HPNP)Ni(N(H)C(CH3)NC5H10)](BF4)2. Nucleophilic addition of piperidine to acetonitrile to produce HN=C(CH3)NC5H10 was catalyzed by [(HPNP)NiNCCH3](BF4)2. Chapter 3: A series of bimetallic ruthenium complexes [HPNPRu(N2)]2(μ-Cl)2](BF4)2 (2), [(HPNPRu(H2)Cl)2(μ-Cl)2](BF4)2 (3), [(HPNPRu)2(μ-H2NNH2)(μ-Cl)2](BF4)2 (4), [(HPNPRu)2(μ-Cl)2(μ-HNNPh)](BF4)2 (5), [HPNPRu(NH3)(ç2-N2H4)](BF4)Cl (6), [(HNP2Ru)2(μ-Cl)2(μ2-OSO2CF3)]OSO2CF3 (7), [HPNPRu]2(μ-Cl)3]BPh4 (8) and [HPNPRu]2(μ-Cl)3]BF4 (9) were isolated and characterized in the course of reactions aimed at studying the reduction of N2 and hydrazine. Complex 4 produces ammonia catalytically from hydrazine, and complex 2 generates ammonia upon reaction with Cp2Co/HLuBF4. DFT calculations support the idea that the diazene complex formed is more stable than the expected Chatt-type intermediate. Chapter 4: The reduction chemistry of cobalt complexes with the PNP ligand was explored. Reaction of (HPNP)CoCl2 (1) with n-BuLi generated the deprotonated Co(II) product (PNP)CoCl (2), and the Co(I) reduced species (HPNP)CoCl (3). The reaction of complex 2 with KC8 was investigated, where it was found that the products obtained depended upon the inert gas used to carry out the reaction: (PNP)CoN2 (4) under N2, bimetallic complex [(PNP)Co]2 (5) under Ar, and (HPNP)Co(H)3 (8) under H2. Complex 5 reacted with H2 to generate the bimetallic complex [(PNP)CoH]2 (6). With H2, H3SiPh and AgBPh4 complex 3 generated the species (HPNP)CoCl(H)2 (9), (HPNP)CoCl(H)SiH2Ph (10) and [(HPNP)CoCl]BPh4 (11) respectively. DFT calculations were performed to gain insights about the transformations observed.

Download or read book Transition Metal Complexes of Ligands Containing Nitrogen and Sulphur Donor Atoms written by Christopher John Jones and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tetravalent Cerium and High Valent Transition Metal Complexes Supported by an Oxygen Tripodal Ligand written by Yat Ming So and published by . This book was released on 2013 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transition Metal Complexes of Neutral Eta1 Carbon Ligands written by Remi Chauvin and published by Springer Science & Business Media. This book was released on 2010-01-12 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is part of a series that gives the broad scientific readership a comprehensive summary and critical overview of specific topics in the field of organometallic chemistry. This text focuses on transition metal complexes of neutral eta1-carbon ligands.

Download or read book Transition Metal Complexes with Sulphur nitrogen Donor Macrocycles and Related Ligands written by Nigel Anthony Atkinson and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Types of Transition Metal Complexes with Redox Active Sulfur and Nitrogen based Ligands written by Bradley William Smucker and published by . This book was released on 2002 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Coordination Chemistry II written by J. A. McCleverty and published by Elsevier Science. This book was released on 2004 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Coordination Chemistry II (CCC II) is the sequel to what has become a classic in the field, Comprehensive Coordination Chemistry, published in 1987. CCC II builds on the first and surveys new developments authoritatively in over 200 newly comissioned chapters, with an emphasis on current trends in biology, materials science and other areas of contemporary scientific interest.

Download or read book Studies of Some Group VIII Metal Complexes Containing Oxygen Or Sulphur Donor Ligands written by Peter Brandon Critchlow and published by . This book was released on 1977 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies of Transition Metal Complexes Using a New Unsymmetric Multidentate Chelate Ligand written by Satcher, Jr. (Joe Harold) and published by . This book was released on 1995 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: