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Book Magnetic and Spectral Properties of Some Mono and Polynuclear Transition Metal Complexes

Download or read book Magnetic and Spectral Properties of Some Mono and Polynuclear Transition Metal Complexes written by John Keith Porter and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Magnetism and Coordination Chemistry of Mononuclear and Polynuclear Complexes of Copper II and Other First Row Transition Metal Ions Derived from Open chain Diazine N N Ligands

Download or read book The Magnetism and Coordination Chemistry of Mononuclear and Polynuclear Complexes of Copper II and Other First Row Transition Metal Ions Derived from Open chain Diazine N N Ligands written by Zhiqiang Xu and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the structures and the magnetic properties of the first row transition metal complexes containing open-chain diazine (N-N) moieties. The purpose of the research is to establish a magnetostructural correlation involving the N-N single bond bridge and to investigate the coordination chemistry of open-chain diazine ligands to the first row transition metal ions. A relevant literature search is presented in Chapter 1. -- Chapter 1 describes a general introduction to magnetic exchange in polynuclear copper complexes and a general review of the coordination chemistry of diazine (N2) bridged complexes. In Chapter 2, seventeen dicopper(II) complexes with five open-chain diazine ligands (PAHAP, PMHAP, PHMAP, PHAAP and PYPZ) are reported, in which the two copper(II) centers are bridged by a single N-N bond only. The X-ray structures of one ligand and twelve dinuclear copper(II) complexes were determined. Changing the ligands, together with varying the coligands leads to a situation where the dihedral angle between the copper planes can be varied from 75° to 168.5°. For small angles (less than 80°) ferromagnetic coupling prevails, whereas at larger angles antiferromagnetic exchange is observed between the copper(II) centers. The exchange integrals (-2J) vary from -24.4 to 210 cm−1. This is associated with the degree of alignment of the nitrogen p orbitals in the diazine bridge, and is supported by molecular orbital calculations on the complexes and appropriate models. Chapter 3 deals mainly with dinuclear copper(II) complexes containing two ligands bridging two metal centers. The dinuclear copper(II) complexes containing two N-N single bonds have no or very weak coupling because of orbital orthogonality and the twisting of the two copper planes around these two N-N single bonds. A dicopper complex containing mixed diazine bridges (pyridazine/N-N) shows weak antiferromagnetic coupling, and since the diazine unit in the aromatic ring system bridges two copper centers in an orthogonal manner, this net antiferromagnetic coupling occurs only through the open-chain diazine bridge. A tetranuclear copper complex contains two pairs of dicopper(II) centers bridged orthogonally by two μ2-1,1-azide anions with each pair of copper(II) centers bridged by one N-N single bond and one μ2-1,1-azide with a 119° azide bridge angle. The dihedral angle about the N-N single bond is 54°, which indicates either no coupling or weak ferromagnetic coupling via such a bridge. Therefore, the strong antiferromagnetic coupling (-2J = 246 cm−1 ) occurs only through the μ2-1,1-azide bridges between each pair of copper(II) centers, giving the first genuine example contradicting the spin polarization mechanism associated with azide bridges. In Chapter 4, a series of spiral-like dinuclear complexes of Mn(II), Fe(II), Fe(III), Co(II), Co(III) and Ni(II) ions containing three N-N single bonds with a formula [L3M2].(X)n.mH2O (L = PAHAP, PZHPZ; X = CIO4 or NO3; n = 4, 6) and a seven-coordinate Fe(III) complex are discussed. The X-ray structures of six of these complexes have been determined. Variable-temperature magnetic properties, electrochemistry and spectra are discussed. Chapter 5 discusses the synthesis, structural and magnetic properties of some mononuclear and polynuclear first row transition metal complexes of the open-chain diazine ligands. The X-ray structures of eight complexes were determined. Two new coordination modes for open-chain diazine ligands have been found. In the last chapter, a general conclusion about coordination modes, magnetostructural correlations, etc. of the open-chain diazine complexes is made.

Book Spectral Methods in Transition Metal Complexes

Download or read book Spectral Methods in Transition Metal Complexes written by K. Sridharan and published by Elsevier. This book was released on 2016-02-13 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectral Methods in Transition Metal Complexes provides a conceptual understanding on how to interpret the optical UV-vis, vibrational EPR, and NMR spectroscopy of transition metal complexes. Metal complexes have broad applications across chemistry in the areas of drug discovery, such as anticancer drugs, sensors, special materials for specific requirements, and catalysis, so a thorough knowledge in preparation and characterization of metal complexes, while niche, is critical. Accessible to both the seasoned researcher and the graduate student alike, this book provides readers with a single source of content that addresses spectral methods in transition metal complexes. Provides readers with a single reference on metal complexes and coordination compounds Contains more than 100 figures, tables, and illustrations to aid in the retention of key concepts Authored by a scientist with nearly 40 years of experience in research and instruction

Book Magnetic Properties of Polymeric and Polynuclear Transition Metal Complexes

Download or read book Magnetic Properties of Polymeric and Polynuclear Transition Metal Complexes written by Richard Paul Eckberg and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Synthesis Magnetic and Spectral Studies of Some Mono and Binuclear Transition Metal Complexes of Substituted 1 3 5 triketones and Their Schiff base Derivatives

Download or read book Synthesis Magnetic and Spectral Studies of Some Mono and Binuclear Transition Metal Complexes of Substituted 1 3 5 triketones and Their Schiff base Derivatives written by James Lonzo Mack and published by . This book was released on 1978 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Magnetic and Spectral Properties of Multinuclear Transition Metal Complexes Derived from Bidentate Schiff Base Complexes

Download or read book The Magnetic and Spectral Properties of Multinuclear Transition Metal Complexes Derived from Bidentate Schiff Base Complexes written by John Oliver Miners and published by . This book was released on 1971 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Electronic and Vibronic Spectra of Transition Metal Complexes II

Download or read book Electronic and Vibronic Spectra of Transition Metal Complexes II written by Hartmut Yersin and published by Springer Science & Business Media. This book was released on 1997-07-16 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: The unique properties and applications of transition metal compounds have long fascinated both physicists and chemists. This volume presents theoretical and experimental studies for a deeper understanding of the electronic and vibronic properties of these compounds. In particular, an introduction into properties of spin sublevels of dd*, dÂ*, and ÂÂ* states is given, and a modern ligand field theory based on the Angular Overlap Model is presented. In experimental case studies it is shown how to characterize different types of electronic transitions using modern methods of laser spectroscopy. Consequences of spin-orbit coupling, zero-field splittings, spin-lattice relaxations, chromophore-matrix interactions, Herzberg-Teller/Franck-Condon activities, and localization/delocalization properties are treated.

Book Magnetic Properties of Some Transition Metal Complexes

Download or read book Magnetic Properties of Some Transition Metal Complexes written by Ann Richards and published by . This book was released on 1967 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Experimental and Theoretical Studies of the Spectral Properties of Some First Row Transition Metal Complexes

Download or read book Experimental and Theoretical Studies of the Spectral Properties of Some First Row Transition Metal Complexes written by William Frederick Cooper and published by . This book was released on 1971 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Electronic and Magnetic Properties of Transition and Inner Transition Elements and Their Complexes

Download or read book Electronic and Magnetic Properties of Transition and Inner Transition Elements and Their Complexes written by Sandeep Kaur-Ghumaan and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book focuses on the principles of electronic and magnetic properties of transition and inner transition metal ions/complexes. It is one of the essential and fundamental topics for graduate and undergraduate students, and it is also important for researchers. The book also covers basic concepts of symmetry in orbital, point group, spectroscopic terms and energy level diagrams. Crystal field, ligand field and molecular orbital theory (along with their importance in spectra) are elaborated. Further magnetic properties of transition metal ions/complexes as well as their spin and orbital contributions have been described in this book.

Book Magnetic and magneto optical properties of some transition metal compounds

Download or read book Magnetic and magneto optical properties of some transition metal compounds written by Jan Hendrik Wijngaard and published by . This book was released on 1990 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: