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M.D. Taylor

Bio: M.D. Taylor is an academic researcher from University of Washington. The author has contributed to research in topics: Halide & Decomposition. The author has an hindex of 4, co-authored 7 publications receiving 637 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a general method is described which can be used to synthesize nearly all the lanthanide halides in high purity and good yield, including tri-halides except the iodides of samarium and europium.

518 citations

Journal ArticleDOI
TL;DR: In this article, the I.r. absorption spectra for benzoic acid and the benzoates of Na, Pr, Nd, Er, and Tm have been measured over the frequency range 3400−200 cm−1.

101 citations

Journal ArticleDOI
TL;DR: In this paper, the absorption spectra for the halides of La, Nd, Sm, Eu, Gd, Er, and Yb have been measured over the frequency range 4000-200 cm−1.

11 citations

Journal ArticleDOI
TL;DR: In this paper, the modes of decomposition of rare earth metal formates and benzoates were studied by the use of DTA, DSC, TG and DTG techniques in air, nitrogen and vacuum.
Abstract: The modes of decomposition of a few rare earth metal formates and benzoates were studied by the use of DTA, DSC, TG and DTG techniques in air, nitrogen and vacuum. The volatile products and residues were identified. The activation energies of decompositions and the heat of reaction for transitions were calculated.

8 citations

Journal ArticleDOI
TL;DR: In this article, the silver, lead and mercuric toluenedithiolates were synthesized and analyzed by both conventional chemical methods and thermoanalytical methods, and the activation energies for the first stage of decomposition were calculated.
Abstract: The silver, lead and mercuric toluenedithiolates were synthesised and analysed by both conventional chemical methods and thermoanalytical methods. The thermal decomposition was studied by thermogravimetric analysis in air, nitrogen and vacuum. The formulae of the decomposition products were derived using the mole weights and i.r. absorption spectra. The activation energies for the first stage of decomposition were calculated. The volatile products contain mostly carbon and hydrogen while the residues contain the corresponding metals either free or combined with sulfur.

4 citations


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Book
02 Dec 2015
TL;DR: A comprehensive review of the extractive metallurgy of rare earths can be found in this article, where the topics covered are: world rare earth resources and production; ore processing and separation of individual rare earth elements; reduction, refining, and ultrapurification of rare Earth elements; methods for rare earth materials analysis; and a selection of the numerous rare earth applications.
Abstract: A comprehensive review is presented of the extractive metallurgy of rare earths. The topics covered are: world rare earth resources and production; ore processing and separation of individual rare earths; reduction, refining, and ultrapurification of rare earth elements; methods for rare earth materials analysis; and a selection of the numerous rare earth applications. World rare earth reserves are abundant and would last for well beyond the next century. However, all of the 16 naturally occurring rare earth elements are not equally distributed in the ore minerals. This, compounded with the problems specific to the isolation and recovery of each of the rare earths, sets the stage for an unequal rare earth availability. The close chemical similarity of rare earths looses its importance when divergent physical properties determine the processes for rare earth element reduction and refining. The rare earth metals, alloys, and compounds have been as pure as could be determined. Finally, the commercial...

1,025 citations

Book ChapterDOI
TL;DR: In this paper, a review of the polymerization of dienes by neodymium-based Ziegler/Natta-catalyst systems is presented, focusing on the monomer 1,3-butadiene (BD).
Abstract: This article reviews the polymerization of dienes by neodymium (Nd) based Ziegler/Natta-catalyst systems Special attention is paid to the monomer 1,3-butadiene (BD) The review covers scientific as well as patent literature which was published during the last decade to 2005 For a better understanding of the recent developments the early work on lanthanide-catalyzed diene polymerization is also addressed The most important product obtained by Nd catalysis, butadiene rubber (Nd-BR) is introduced from an industrial as well as from a material scientist's point of view Strong attention is paid to the great variety of Ziegler/Natta type Nd-catalyst systems which are often referred to as binary, ternary and quaternary systems Different Nd-precursors, cocatalysts, halide donors and other additives are reviewed in detail Technological aspects such as solvents, catalyst addition order, catalyst preformation, polymerization temperature, molar mass control, post-polymerization modifications etc, are presented A considerable part of this review discusses variations of the molar ratios of the catalyst components and their influence on the polymerization characteristics Non-established polymerization technologies such as polymerization in bulk, slurry and gas phase as well as the homopolymerization in the presence of other monomers are addressed Also the copolymerizations of butadiene with isoprene, styrene and alkenes are reviewed Mechanistic aspects such as formation of the active catalyst species, the living character of the polymerization, mode of monomer insertion, and molar mass control reactions are also explained In the summary Nd technology is evaluated in comparison with other established technologies for the production of high cis-1,4-BR Unsolved and open questions about Nd-catalyzed diene polymerization are also presented

289 citations

Journal ArticleDOI
TL;DR: In this article, Eu-containing copolymers were synthesized through copolymerization of Eu−complex monomers containing β-diketones with methyl methacrylate and characterized by FT-IR, UV−vis, XPS, GPC, TGA, and DSC.
Abstract: Luminescent Eu-containing copolymers were synthesized through the copolymerization of Eu−complex monomers containing β-diketones with methyl methacrylate and characterized by FT-IR, UV−vis, XPS, GPC, TGA, and DSC. All these Eu copolymers are fully soluble in common organic solvents and can be cast into transparent, uniform, thin films with good mechanical flexibility and thermal stability. The Eu−copolymer luminophores exhibited intense red light at 615 nm under UV excitation at room temperature, which is attributed to the 5D0→7F2 transition of Eu(III) ions. The luminescence intensities, lifetimes and monochromaticities, η(5D0→7F2/5D0→7F1), of the Eu−copolymers are much higher than that of the corresponding Eu−complex monomers as well as Eu−complex/PMMA blends. Energy transfer processes and microenvironment effects were found to contribute to the improvement of the luminescence properties of the Eu−copolymers. A study of the dependence of emission intensities of the Eu−copolymers on the Eu content showed ...

242 citations

Journal ArticleDOI
TL;DR: The synthesized bis(guanidinate) alkoxides are able to promote the stereoselective ROP of rac-beta-butyrolactone to afford syndiotactic poly(hydrobutyrate) through a chain-end control mechanism, while they are surprisingly non-stereoselectIVE for the Rop of lactide under strictly similar conditions.
Abstract: A series of new bis(guanidinate) alkoxide Group 3 metal complexes [Ln((Me3Si)2NC(NiPr)2)2(OR)] (R=OtBu, Ln=Y, Nd, Sm, Lu; R=OiPr, Ln=Y, Nd, Lu) has been synthesized. X-ray structural determinations revealed that bis(guanidinate) tert-butoxides are monomeric complexes. The isopropoxide complex [Y((Me3Si)2NC(NiPr)2)2(OiPr)] undergoes slow decomposition in solution, to afford the unusual dimeric amido complex [(Y((Me3Si)2NC(NiPr)2)2(mu-N(iPr)C triple chemical bond N))2]. Complexes [Ln((Me3Si)2NC(NiPr)2)2(OR)] (R=OtBu, Ln=Y, Nd, Sm, Lu; R=OiPr, Ln=Y, Nd, Lu) are active catalysts/initiators for the ROP of rac-lactide and rac-beta-butyrolactone under mild conditions. Most of those polymerizations proceed with a significant degree of control. Bis(guanidinate) alkoxides appear to be well suited for achieving immortal polymerization of lactide, through the introduction of large amounts of isopropanol as a chain-transfer agent. The synthesized complexes are able to promote the stereoselective ROP of rac-beta-butyrolactone to afford syndiotactic poly(hydrobutyrate) through a chain-end control mechanism, while they are surprisingly non-stereoselective for the ROP of lactide under strictly similar conditions.

159 citations

Journal ArticleDOI
TL;DR: In this paper, the reaction of the mixed-metal lanthanide/magnesium allyl complexes [Ln(η3-C3H5)3(μ-C4H8O2)·Mg( η1-C 3H5 )2(mg(mCNC6H3Pri2-2,6)2)2}(mH4H 8O2 )2

143 citations