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 Transition Metal Complexes with Redox active Ligands written by Shawn Michael Swavey and published by . This book was released on 1998 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transition Metals and Sulfur A Strong Relationship for Life written by Martha Sosa Torres and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-04-06 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Ions in Life Sciences links coordination chemistry and biochemistry in their widest sense and thus increases our understanding of the relationship between the chemistry of metals and life processes; in fact, it is an old wisdom that metals are indispensable for life. The series reflects the interdisciplinary nature of Biological Inorganic Chemistry and coordinates the efforts of scientists in numerous interconnecting research fields.
Download or read book Redox Active Ligands written by Marine Desage-El Murr and published by John Wiley & Sons. This book was released on 2024-01-31 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: Redox-Active Ligands Authoritative resource showcasing a new family of ligands that can lead to better catalysts and promising applications in organic synthesis Redox-Active Ligands gives a comprehensive overview of the unique features of redox-active ligands, describing their structure and synthesis, the characterization of their coordination complexes, and important applications in homogeneous catalysis. The work reflects the diversity of the subject by including ongoing research spanning coordination chemistry, organometallic chemistry, bioinspired catalysis, proton and electron transfer, and the ability of such ligands to interact with early and late transition metals, lanthanides, and actinides. The book is divided into three parts, devoted to introduction and concepts, applications, and case studies. After the introduction on key concepts related to the field, and the different types of ligands and complexes in which ligand-centered redox activity is commonly observed, mechanistic and computational studies are described. The second part focuses on catalytic applications of redox-active complexes, including examples from radical transformations, coordination chemistry and organic synthesis. Finally, case studies of redox-active guanidine ligands, and of lanthanides and actinides are presented. Other specific sample topics covered include: An overview of the electronic features of redox-active ligands, covering their historical perspective and biological background The versatility and mode of action of redox-active ligands, which sets them apart from more classic and tunable ligands such as phosphines or N-heterocyclic carbenes Preparation and catalytic applications of complexes of stable N-aryl radicals Metal complexes with redox-active ligands in H+/e- transfer transformations By providing up-to-date information on important concepts and applications, Redox-Active Ligands is an essential reading for researchers working in organometallic and coordination chemistry, catalysis, organic synthesis, and (bio)inorganic chemistry, as well as newcomers to the field.
Download or read book Transition metal Complexes Containing Nitrogen Phosphorus Or Sulfur written by R. B. King and published by . This book was released on 1967 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of four years' work are outlined. Major advances were achieved in the following areas: (1) New arylazo derivatives of molybdenum, (2) new cyclopentadienyl metal nitrosyl derivatives of molybdenum and manganese, (3) new isonitrile derivatives of chromium, molybdenum, and tungsten, (4) trisacetonitrilemetal tricarbonyls of chromium, molybdenum and tungsten as preparative reagents, (5) novel complexes from trifluoroacetonitrile, (6) cyclic acyl derivatives with organonitrogen and organosulfur ligands, (7) metal carbonyl complexes of unsaturated phosphines, (8) new pi-CH3SCH2 derivatives, (9) new complexes with terminal and with bridging methylthio groups, (10) new complexes obtained from bis(trifluoromethyl)dithietene and disodium cis-ethylenedithiolate, (11) new chemistry of the metal carbonyl anions, (12) preparation and reactions of cyclopentadienyl-diiodocarbonylcobalt, (13) new pi-pentamethylcyclopentadienyl derivatives of various metals, and (14) new polynuclear cyclopentadienylmetal carbonyls of iron and cobalt. (Author).
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 Design and Synthesis of a Series of Redox Active Tetrazine and Triazine Based Transition Metal Complexes written by Yixin Zhang and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of two different chelating redox active ligands, 2,6-bis(6-methyl-1,2,4,5-3-yl) pyridine (BTZP) and 2,6-bis-(5,6-dialkyl-1,2,4-triazin-3-yl)-pyridine (BTP) in heterometallic first row and second row transition metal chemistry has yielded two new families of redox active metal complexes. These complexes were found to exhibit interesting electrochemical and magnetic properties. In this thesis, Chapter 1 lays the foundation for the research presented within. This section covers the fundamentals of the ligand design, ligand synthesis and related coordination chemistry literature review. Chapters 2 and 3 report the results of the current thesis. In Chapter 2, the synthesis and characterization of a family of discrete molecules and supramolecular arrangements, employing the ligand BTZP, is presented. All of the complexes presented in Chapter 2 are successfully synthesized and characterized with electrochemical and magnetic studies. According to the electrochemical data, it is found that the classic "terpy-like" complexes with [Co(BTZP) 2]2+ formula fosters more stability in the redox process. In Chapter 3, a family of transition metal complexes with [M(BTP) 2]2+ (M=Fe or Co) inorganic cores were obtained through the employment of the ligand BTP with various anions. In addition, dimeric molecules with [CoX4(BTP)2] formula were also obtained by solvothermal synthesis. The complexes were also electrochemically characterized, with all the complexes capable of being reduced, while only [CoII(BTP)2] (ClO4)2 showed reversible redox process. Similar with BTZP, the series of BTP based complexes are also characterized through magnetic measurement. Only cobalt-based BTP complexes are paramagnetic, with [CoII(BTP)2]2+ being spin crossover active when BF4- and ClO4- are present. However, the presence of NCS- and halides lead to either antiferromagnetic interactions and ferromagnetic interactions dominating at different temperature regimes.
Download or read book Elucidating the Electronic Structure of Transition Metal Complexes Featuring Redox Active Ligands written by Linus Kai Ho Chiang and published by . This book was released on 2014 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis a number of projects involving the design and characterization of complexes bearing redox active ligands are described. Focusing on the phenolate containing ligands, the properties and electronic structure of their corresponding metal complexes were studied by a series of experimental (i.e. electrochemistry, UV-Vis-NIR, EPR, rR etc.) and theoretical (DFT) methods. Specifically, the redox processes of these metal complexes were tuned by varying the para-ring substituents. In one study, nickel-salen (salen is a common abbreviation for N2O2 bis-Schiff-base bis-phenolate ligands) complexes were investigated, where the oxidation potentials of the ligand were predictably decreased as the electron donating ability of the para-ring substituents was increased (NMe2 > OMe > tBu > CF3). Interestingly, the oxidation of these geometrically-symmetric complexes afforded an asymmetric electronic structure in a number of cases, in which the ligand radical was localized on one phenolate rather than delocalized across the ligand framework. This difference in electronic structure was found to be dependent on the electron donating ability of the substituents; a delocalized ligand radical was observed for electron-withdrawing substituents and a localized ligand radical for strongly donating substituents. These studies highlight that para-ring substituents can be used to tune the electronic structure (metal vs. ligand based, localized vs. delocalized radical character) of metallosalen complexes. To evaluate if this electronic tuning can be applied to the metal center, a series of cobalt complexes of these salen ligands were prepared. Indeed, the electronic properties of the metal center were also significantly affected by para-ring substitution. These cobalt-salen complexes were tested as catalysts in organometallic radical-mediated polymerizations, where the most electron rich complexes displayed the best conversion rates. With a firm understanding of the role that the para-ring substituent can play in influencing the electronic structure and reactivity of metallosalen complexes in catalysis, two novel iron complexes, which contain a number of redox active phenolate fragments, were prepared. In addition, these iron-complexes feature a chiral bipyrrolidine backbone. Ligands with this chiral diamine backbone bind metals ions diastereoselectively owing to its increased rigidity, which is critical to stereoselectivity in catalysis. A symmetric (with two phenolates) ligand was prepared by reported methods, and a novel route to synthesize an asymmetric ligand (one phenolate and one pyridine) from symmetric starting materials was established. The neutral iron-complexes were found to be high spin (S = 5/2), and can undergo ligand based oxidation to form an antiferromagnetically-coupled (Stotal = 2) species. The results presented will serve as the basis for catalyst development using complexes of similar ligands.
Download or read book New Transition Metal Complexes with Chelating Nitrogen Ligands written by Sarah Al-Benna and published by . This book was released on 2000 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transition Metal Complexes with Sulfur containing Ligands written by Darrell Dwight Watkins and published by . This book was released on 1973 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural Electron Transfer and Spectroscopic Studies of Transition Metal Complexes with Redox active Non innocent Ligands written by Atanu Kumar Das and published by . This book was released on 2009 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Metal Complexes with Sulfur and Nitrogen containing Ligands written by Claire MacLeod Ohman and published by . This book was released on 2001 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Studies on the Reactions of Some Transition Metal Complexes with Nitrogen and Sulphur Containing Ligands written by John Doherty and published by . This book was released on 1981 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transition Metal Complexes of Oxygen and Sulphur Based Ligands written by Anthony Frederick Masters and published by . This book was released on 1975 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transition Metal Complexes of Porphyrin Analogs and Borate based Coordination Complexes written by Anil Çetin and published by . This book was released on 2007 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis of low-coordinate metal ions has been a focus of bioinorganic chemists due to their important roles in active sites in enzymes and protein. Although the isolation of these types of complexes is challenging, porphyrin analogs with one or two carbon atoms in the interior position can be good candidates for generating protected low coordinate metal sites. The metal coordination of one or two carbon substituted hemiporphyrazines, namely monocarbahemiporphyrazine and dicarbahemiporphyrazine, was investigated. These porphyrin analogs, in which one or two of the central metal binding nitrogen atoms were replaced with C-H groups, were synthesized in the early 1950s by Linstead and co-workers, but their metal binding chemistry remained unexplored. Several low coordinate metal complexes of dicarbahemiporphyrazine, namely silver, copper, manganese, iron and cobalt were synthesized. Three different cobalt complexes of monocarbahemiporphyrazine in +2 and +3 oxidation states were also synthesized. Porpholactone is another example of a ring modified porphyrin isomer. In this macrocycle one of the four pyrrollic units is oxidized to an oxazolone ring. Metal complexes of porpholactone may be novel catalysts for epoxidation of alkenes. The synthesis and X-ray crystal structure of first manganese complex of the porpholactone 5,10,15,20-tetraphenylporpholactone are reported. The catalytic activity of the complex by using a variety of substrates was explored and it was compared with that of manganese tetraphenylporphyrin. Metal complexes of a sulfur containing borate-based chelating ligand, tris(imazolyl)borate, HB(mt)3− were examined. Three different modes of interaction were observed with divalent closed d shell metal metal cations: Ca(II), Ba(II) and Hg(II). This study exhibits the diversity of binding not typically observed in the scorpionate family. With group II and group XII metals, the HB(mt)3− ligand can act as a non-coordinating anion, can engage in B-H agostic bonding, and can form metal cluster compounds. Molecular organization of guest molecules within nanometer-sized structures is a big challenge in terms of controlling the physical properties and chemical reactivities. In our group, we are investigating borate-based coordination polymer, lead tetrakis(imidazolyl)borate, to organize and sequester anionic guests. A variety of anionic guests were organized within the layers lead(II) borate scaffolds. The possibility of topochemical polymerization of these pre-organized anionic monomers in the crystalline state was explored.
Download or read book Transition Metal Complexes with Bidentate Sulfur Containing Ligands written by Ramzi Yanni Saleh and published by . This book was released on 1974 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
