Download or read book Coordination Compounds of Copper II with Pyrazole Ligands written by Y. M. Davydenko and published by GRIN Verlag. This book was released on 2024-10-10 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientific Study from the year 2024 in the subject Chemistry, , language: English, abstract: The monorgaph is dedicated to the development of a new approach to the synthesis of multinuclear copper compounds, which consists in oxidative dissolution of copper powder in the presence of copper(II) halides in non-aqueous solution of organic ligands on air. The difference of the proposed approach from the widely used direct synthesis with ammonium salts is the use of copper(II) halides, which simultaneously act as a controlled source of anions and a primary oxidant of metallic copper. The optimal conditions for the synthesis of copper(II) pyrazole-containing complexes were selected. It was shown that the optimal molar ratio between reagents for the synthesis of μ3-oxocentric trinuclear copper(II) pyrazole-containing complexes is 1:1:2 (copper:copper(II) halide:pyrazole ligand). The final products are formed after the stage of formation of known trinuclear copper(I) compounds. The formation of mainly tetranuclear compounds [Cu4(μ4-O)(μ2-X)6(L1)4] (X – Cl, Br; L1 – 3,5-dimethyl-1Н-pyrazole, 1Н-pyrazole) occurs when the molar ratio is changed to 1:2:3. Most of the first synthesized coordination compounds have a molecular structure and consist of neutral particles. X-ray powder diffraction confirms the crystalline nature of some analyzed samples and the formation of individual compounds. Thermogravimetric analysis of some compounds showed that these complexes are stable to a temperature of 100 ̊С.

Download or read book Syntheses and Crystal Structures of Copper II Chloride Complexes with Some Diols written by Reijo Sillanpää and published by . This book was released on 1984 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Crystal Structures and Magnetic and Electronic Spectral Characterization of Some Polynuclear Alkoxobridged Copper II Complexes Formed by 2 3 Aminopropyl Amino Ethanol written by Kari Nieminen and published by . This book was released on 1983 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nickel II Complexes Containing Non cyclic and Macrocyclic Ligands Derived Brom Benzil Monohydrazone written by Courtney Michael Kerwin and published by . This book was released on 1972 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Polymer or Macrocycle Cobalt Complexes of Ditopic 2 2 6 2 Terpyridine Ligands with Flexible Spacers written by Emily Kate Harris and published by Cuvillier Verlag. This book was released on 2010-07-28 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reaction of transition metal ions with ditopic ligands containing two 2,2':6',2"-terpyridine units linked by flexible spacers can give metallosupramolecular polymers, discrete metallomacrocycles or mixtures of the two. The outcome of the coordination depends on the precise reaction conditions as well as the nature of the spacer and the transition metal salt. This thesis is concerned with the reaction between cobalt(II) salts and bis(2,2':6',2"-terpyridine) ligands in which the metal-binding domains are linked by flexible oligo(ethylene glycol) spacers. An initial study of the ligands and several model mononuclear bis(2,2':6',2"-terpyridine)cobalt(II) and (III) complexes gave some insight into the solid state and solution properties of these systems, and PGSE NMR spectroscopy was found to be a useful tool for determination of the size of both the ligands and the cobalt(III) complexes in solution. The reaction of the ditopic ligands with cobalt(II) acetate tetrahydrate in pure alcohol was found to cause the decomposition of the ligand and the formation of a mononuclear bis(4'-alkoxy-2,2':6',2"-terpyridine)cobalt(II) complex. This reaction was extended to monotopic 4'-substituted-2,2':6',2"-terpyridines and can be considered as a reaction giving rise to polymer end-capping units, thus influencing the final outcome of the coordination. The effect of the anion on the coordination was considered further, and the speciation of mono- and bis(2,2':6',2"-terpyridine)cobalt(II) complexes in solution was investigated using the 4'-methoxy-2,2':6',2"-terpyridine ligand. The product mixtures were found to depend heavily on the anion, solvent and initial ratio of ligand to metal salt. Similar behaviour was observed for a model ditopic ligand. The presence of the mono(2,2':6',2"-terpyridine)cobalt(II) complexes within a system containing the ditopic ligands would also provide polymer end-capping units, influencing the speciation of these mixtures. Finally, a detailed study of the product mixtures obtained from the reactions of the ditopic ligands with cobalt(II) salts revealed a complex dependence of the speciation of many bis(2,2':6',2"-terpyridine)cobalt(II) complexes on the ligand, anion, solvent, concentration and other seemingly minor reaction parameters. Using the PGSE NMR spectroscopic technique, the sizes of some of the metallomacrocyclic species present in the equilibrium mixtures could be determined. These measurements were in excellent agreement with X-ray crystallographic data. Analysis of initial product mixtures using the same technique suggested that the initial kinetic products of the complexation are significantly larger species.

Download or read book Nickel II Complexes Containing Non cyclic and Macrocyclic Ligands Derived from 2 3 butanedione Monohydrazone and 3 3 dimethyl 1 2 butanedione Monohydrazone written by Douglas Brian Bonfoey and published by . This book was released on 1973 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spectroscopic Properties of Inorganic and Organometallic Compounds written by N N Greenwood and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 547 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectroscopic Properties of Inorganic and Organometallic Compounds provides a unique source of information on an important area of chemistry. Divided into sections mainly according to the particular spectroscopic technique used, coverage in each volume includes: NMR (with reference to stereochemistry, dynamic systems, paramagnetic complexes, solid state NMR and Groups 13-18); nuclear quadrupole resonance spectroscopy; vibrational spectroscopy of main group and transition element compounds and coordinated ligands; and electron diffraction. Reflecting the growing volume of published work in this field, researchers will find this Specialist Periodical Report an invaluable source of information on current methods and applications. Specialist Periodical Reports provide systematic and detailed review coverage in major areas of chemical research. Compiled by teams of leading experts in their specialist fields, this series is designed to help the chemistry community keep current with the latest developments in their field. Each volume in the series is published either annually or biennially and is a superb reference point for researchers. www.rsc.org/spr