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Author : Geng Bang Jin
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (191 download)
Download or read book Synthesis and Characterization of New Lanthanide Chalcogenides written by Geng Bang Jin and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sooa Tara Cho
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (977 download)
Download or read book Synthesis and Characterization of New Luminescent Lanthanide Complexes written by Sooa Tara Cho and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sooa Tara Cho
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.:/5 (977 download)
Download or read book Synthesis and Characterization of New Luminescent Lanthanide Complexes written by Sooa Tara Cho and published by . This book was released on 2014 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Theodore Dennis Brennan
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (718 download)
Download or read book Synthesis and Characterization of New Mixed-metal Chalcogenides and Oxychalcogenides written by Theodore Dennis Brennan and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Steven Arthur Sunshine
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (717 download)
Download or read book Synthesis and Characterization of New Low Dimensional Transition Metal Chalcogenides written by Steven Arthur Sunshine and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Joonyeong Kim
Publisher :
ISBN 13 :
Total Pages : 368 pages
Book Rating : 4.:/5 (439 download)
Download or read book Synthesis and Characterization of New Chalcogenides with Tetrahedral Building Blocks written by Joonyeong Kim and published by . This book was released on 1999 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Emma Nicholls-Allison
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (98 download)
Download or read book Part I written by Emma Nicholls-Allison and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Reported in Chapter 2 of this thesis is the reliable and tolerant synthesis of a small library of pyrazole and triazole heterocycles. This synthesis was achieved in two steps in good yields from the reaction of acetophenone and benzamide derivatives with dimethyl formamide-dimethyl acetal followed by a cyclization with hydrazine. Also reported is the synthesis and characterization of their corresponding scorpionate ligands. Preliminary coordination chemistry was done with a variety of lanthanide metals and was studied by standard spectroscopic methods as well as variable temperature 1H NMR, which revealed that Curie-Weiss behaviour was followed for these complexes in solution. An X-ray crystal structure of a nine co-ordinate ytterbium metal centre with eight nitrogen atom (four pyrazole, four pyridine) donors and one chloride atom was obtained, which may have been a product of decomposition during crystal growth. The bond lengths of this structure were compared with other lanthanide complexes of similar structural motifs. This comparison supported the theory of decomposition as the pyridine nitrogen atom-ytterbium bond lengths were longer than the average ytterbium-nitrogen atom bond length.
Author : Stephen T Liddle
Publisher : World Scientific
ISBN 13 : 1800610173
Total Pages : 727 pages
Book Rating : 4.8/5 (6 download)
Download or read book Lanthanides And Actinides, The: Synthesis, Reactivity, Properties And Applications written by Stephen T Liddle and published by World Scientific. This book was released on 2021-12-30 with total page 727 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lanthanides and Actinides: Synthesis, Reactivity, Properties and Applications constitutes an introduction to and comprehensive coverage of f-block chemistry encompassing the following areas: periodicity, natural occurrence and extraction, separations, electronic structure, coordination chemistry, organometallic chemistry, small molecule activation, catalysis, organic synthesis applications, magnetism, spectroscopy, computation, materials, photonics, solar cell technology, biological imaging, and technological applications. Under these subject areas the book provides a broad but deep coverage, providing basic overviews as well as detailed chapters on specific areas.This book, targeted at academics, postgraduates and advanced undergraduates, will serve as an ideal introductory text and key reference work to the Lanthanides and Actinides.
Author : Douglas A. Keszler
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (562 download)
Download or read book New Transitional Metal Chalcogenides written by Douglas A. Keszler and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sandeep S. Dhingra
Publisher :
ISBN 13 :
Total Pages : 738 pages
Book Rating : 4.:/5 (18 download)
Download or read book Synthesis, Structural, Spectroscopic Characterization of New Polychalcogenide Complexes of Indium and Thallium, and Their Application as Precursors to Solid State Materials written by Sandeep S. Dhingra and published by . This book was released on 1992 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ramesh Duraisamy
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (116 download)
Download or read book Synthesis and Structural Characterization of New Alkali Metal, Alkalineearth Metal, and Lanthanide Complexes with 1,4-diazabutadiene Ligands written by Ramesh Duraisamy and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Brian Freeman Moore
Publisher :
ISBN 13 :
Total Pages : 129 pages
Book Rating : 4.:/5 (856 download)
Download or read book Finding New Equilibria written by Brian Freeman Moore and published by . This book was released on 2013 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation covers the synthesis and characterization of three unique classes of lanthanide materials produced exclusively by the addition of sodium azide (NaN3) into solution based lanthanide reactions. The products were achieved through transmetallation and redox reactions between rare earth chalcogenolate reagents (Lnx(EPh)y), NaN3 and elemental chalcogenides (E = O, S, Se, Te). The products displayed atypical structural and physical properties including; unique coordination geometries, high nuclearities, tunable detonation/deflagration, strong NIR emissions, and unexpected magnetic ordering behaviors. The introduction of NaN3, Na2O, Cd, elemental Se and Te into Ln (EPh)2 and Ln(EPh)3 pyridine (py) solutions led to the production of (py) 2Na2(EPh)2 and 5 structurally distinct azide encapsulated rare earth clusters; (Py)10Sm6O2(N3)16Na2, (py)8Ln6O2(N3)12(SePh)2, (py)10Ln6O2(Se2) 2(N3)10 (Ln=Er, Ho), and (py)16Sm8Se(O2)Na2(Te2)6(N3)8. Each system was encapsulated by a variety of azide bridging moieties, while exhibiting a [Ln]/[N3] dependent correlation with detonation and deflagration temperatures.! The inclusion of NaN3 in Ln(SePh)3 pyridine solutions with elemental Se, led to the discovery of the (py)16Ln17NaSe18(SePh)16; (Ln= Ce, Pr, and Nd). Emission studies of the Nd17 analogue, revealed a 35% quantum efficiency for the 4F3/2 - 4I11/2 transition (1070 nm emission), and a near solid state emission intensity for the 4F3/2 [right arrow] 4I15/2 transition (1822 nm emission). The novel Eu(EPh)4Na2·2DME; (E=S, Se), specimens were synthesized by the combination of Eu(EPh)2 with NaN3 in dimethoxyethane (DME). The europium coordination sphere was solvent free and resembles the coordinations of europium monochalcogenides (EuE). Comparative structural analysis and magnetic susceptibility studies of the Eu3+ product, ((py)6Eu2(?4-S2)2(OC6F5)2) revealed paramagnetic ordering at low temperature for Eu(EPh)4Na2·2DME; (E=S, Se), while ferrimagnetic ordering was found for ((py)6Eu2(?4-S2)2(OC6F5)2). All materials exhibited antiferromagnetic ordering above 50 K, while a Curie temperature of 18.0 K was determined for ((py)6Eu2(Îơ2-S2)2-(OC6F5)2).
Author : Benjamin George Tokheim
Publisher :
ISBN 13 :
Total Pages : 198 pages
Book Rating : 4.:/5 (969 download)
Download or read book Synthesis and Characterization of New Unsymmetrical Diglycolamides for Trivalent Lanthanide Metal Extraction written by Benjamin George Tokheim and published by . This book was released on 2016 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Twelve new unsymmetrical diglycolamide (UDGA) ligands have been synthesized as solvent extraction reagents for trivalent lanthanide ions from highly acidic nitrate media. The asymmetry in the extractant design arises from attaching nonpolar alkyl chains (hexyl, octyl, 2-ethylhexyl, 3,7-dimethyloctyl) to one amide group and smaller, more compact, cyclic alkyl groups (pyrrolidinyl, piperidinyl, morpholino) to the other amide moiety. This structural variant of a well-known cation receptor reduces the interfacial footprint of the extractant and is designed to increase the rate of phase transfer of the target cations. The partitioning of 152,154Eu(III) between aqueous phases of varying nitric acid concentrations (0.01-3 M) and a 0.05 M UDGA in 5% v/v 1-octanol/n-dodecane organic phase was measured radiometrically and compared to the symmetrical diglycolamide, N,N,N',N'-tetraoctyldiglycolamide (TODGA). All twelve UDGA ligands quantitatively extracted trivalent Eu(III) cations from 1 M nitric acid. Separate solvent extraction slope analysis experiments were used to determine the stoichiometry and conditional extraction equilibrium constant (K'ex) of the extracted Eu-UDGA complex in 5% v/v 1-octanol/n-dodecane. The metal-ligand complex stoichiometry in the extracted species was found to be approximately 1:3 for the UDGA ligands and TODGA while the conditional extraction equilibrium constants ( K'ex) decreased with increasing ligand size and alkyl chain branching. Luminescence spectroscopy investigations established the relative stability and stoichiometry of the complexes in acetonitrile. The overall trends in the conditional extraction equilibrium constant ( K'ex) and the 1:3 conditional stability constant (beta 103) followed a similar pattern, indicating a correlation between complex stability and ligand structural features.
Author : Peter Ndibewu
Publisher : BoD – Books on Demand
ISBN 13 : 1789850193
Total Pages : 122 pages
Book Rating : 4.7/5 (898 download)
Download or read book Chalcogen Chemistry written by Peter Ndibewu and published by BoD – Books on Demand. This book was released on 2019-02-20 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a handy textbook comprised of chapters introducing the fundamentals of chalcogen chemistry with a focus on chalcogens and selected derived compounds and/or materials with illustrative practical applications. These low-valent chemistry elements of Group 16 or group VI- in the modern periodic table include oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and polonium (Po), and they exhibit extremely interesting properties. They are endowed with supramolecular and structure bonding reactivities that allow them to form a variety of new compounds with sophisticated characteristics, thus making their way into a new era of materials development. It is hoped that readers of this textbook with a general background knowledge in chemistry, biogeochemistry, biochemistry, biology, food, agriculture, and also medicine, as well as pharmacy, will find the chapters enriching in new knowledge. An introductory chapter orients readership in this particular field of chemistry with a summative focus on the multidisciplinary approach employed in the compilation of the chapters. As such, the text is suitable for scientists, technologists, students, as well as those whose major interest is chalcogen chemistry, with particular interests in the chalcogen compounds and materials.
Author : James Emmett Jerome
Publisher :
ISBN 13 :
Total Pages : 976 pages
Book Rating : 4.:/5 (39 download)
Download or read book Synthesis, Structure, and Characterization of New Ternary and Quaternary Chalcogenides from Supercritical Amine Systems written by James Emmett Jerome and published by . This book was released on 1997 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (43 download)
Download or read book Design, Synthesis and Characterization of Novel Semiconducting Metal Chalcogenides with Multifunctional Properties written by and published by . This book was released on 2008 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal chalcogenides possess a wide range of interesting chemical and physical properties, including low-temperature superconductivity, semiconductivity, ionic conductivity, intercalation, and optical properties. To expand chalcogenides beyond their traditional applications, it is desirable to generate novel chalcogenide materials with multifunctionality for uses in the areas of catalysis, separation, ion exchange, and gas storage by modifying the framework architectures and tuning the chemical components. The primary focus of my Ph. D. study is to design and synthesize chalcogenide materials with new structures and interesting multifunctional properties. The large variety of chemical compositions and structures make it possible to tune the properties, such as band gap, luminescence, pore size, surface area, and thermal stability. Most of the synthesis has been carried out using solvothermal reactions refs in pyrex tube or teflon lined autoclaves. Novel three-dimensional (3D) microporous chalcogenides constructed on building units [M-Sn-Q]n- (M=Zn, Cd, Mn; Q=S, Se) have been obtained. Their structures have been characterized by both single crystal and powder X-ray diffraction methods. Optical diffuse reflectance experiments have indicated that these compounds are semiconductors with intermediate band gaps between 1.5~2.9eV. The successful doping/substitution of 5%~20% Mn and Se in the [Zn-Sn-S]n- structure allows systematic tuning of the band gap and optical properties of this semiconductor compound. All compounds show a high thermal stability over 400°C. Our studies also show that the guest molecules and cations residing in the open frameworks are exchangeable. Another novel two dimentional ion sulfide [Fe(en)3]·[Fe16S20]·en compound was synthesized as well. UV-Vis reflectance spectroscopy showed a very low absorption coefficient and small band gap ~0.5eV. Doping/substitution experiments with Co and Mn replacing Fe were carried out and the properties will be discussed. In summary, this work has provided examples of rational synthesis and property tuning of new functional materials with new structure types, and demonstrated structure-property correlation in metal chalcogenide based compounds. It has provided useful information for the future developments of material synthesis with desired multifunctionality.
Author : Brendan J. Peachey
Publisher :
ISBN 13 :
Total Pages : 380 pages
Book Rating : 4.:/5 (221 download)
Download or read book The Synthesis and Characterization of New Calixarenes and Their Use as Solvent Extraction Agents for the Lanthanides and Actinides written by Brendan J. Peachey and published by . This book was released on 1995 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
