lanthanide transition metal alloy hydrides

... Properties of Transition- Metal Compounds Finally, we summarize some of the properties of transition- metal compounds and attempt to distinguish those which are characteristic of a transition- metal complex ... group and transition- metal ions Transition- metal complexes may gain or lose ligands to change geometry and so main group complexes The existence of coordination chemistry in the transition- metal ... 18 Nevertheless, the transition elements are also, and interchangeably, known as the transition metals in view of their typical metallic properties The chemistry of the transition elements has...

Ngày tải lên: 04/06/2014, 16:04

... photocatalysis system, transition- metal sulfides (MS = Ag2S, SnS, and CuS) combined with noble -metal Pt acted as dual co-catalysts for photocatalytic hydrogen evolution However, when transition- metal sulfides ... nm) can be assigned to the absorption of transition- metal sulfides We investigated the photocatalytic activity for hydrogen evolution over MS/ZnIn S (MS = metal sulfide: Ag S, SnS, CoS, CuS, NiS, ... with noble metals as reduction catalysts and noble -metal sulfides as oxidation catalysts [29,30] It is noteworthy that replacing Figure TEM images (A) ZnIn2S4 and (B) CuS/ZnIn2S4 noble -metal sulfides...

Ngày tải lên: 21/06/2014, 04:20

... without any metal/ alloy filling (Fig 1d) Energy dispersive X-ray analysis (EDAX) spectra of the alloy- filled MWNTs (Fig 2a) showed the presence of Zr, Cr, Fe and Ni; the constituents of the alloy, with ... Zr-based AB2 alloy filled MWNT, which was obtained with methane decomposition at 850°C Uniform filling of the alloy has been observed inside the CNT cavity A magnified TEM image of the alloy- filled ... their enhanced properties Mischmetal (Mm) based AB2 and AB5 hydrogen storage alloys have also been used as catalysts for the growth of MWNTs [17] Filling Mm based alloy inside the MWNTs would effectively...

Ngày tải lên: 22/06/2014, 22:20

... Overview of transition metal (W, Mo) oxides and their electrochromic properties 1.1 Introduction of transition metal In chemistry, the term transition metal (sometimes also called a transition ... metal - semiconductor transition at the very end of metallic behavior of much smaller particles The size at which the transition occurs depends on the type of metal and criterion chosen for metallicity ... the atoms In this way, the transition metals represent the transition between group elements and group 13 elements -3Table 1.1 The periodic table of the 40 transition metals Group (III (IV B) B)...

Ngày tải lên: 25/03/2015, 11:58

Ngày tải lên: 08/09/2015, 19:36

... DESIGN AND APPLICATIONS OF PHOSPHINE LIGANDS TO TRANSITION METAL- CATALYZED REACTIONS JIANG CHUNHUI (M.Sc., Nanjing Univ.) A THESIS SUBMITTED FOR THE ... Chapter Development of New Phosphine Ligands Derived from Amino Acids and Their Applications in Transition- Metal- Catalyzed Asymmetric Reactions 4.1 Introduction 139 4.2 Results and discussions 145 ... Phosphine-olefin ligands 167 4.4.2.6 Phosphine-imine ligands 168 4.4.3 General procedure for transition- metal- catalyzed reactions 169 4.4.3.1 Pd-catalyzed AAA reaction 169 4.4.3.1 Ag-catalyzed Mannich...

Ngày tải lên: 09/09/2015, 09:59

... supported metal catalysts with the smallest possible metal crystallites Academic interest into the catalytic activities of supported nanosized transition metals is flourishing Many transition metals ... the metal rather than reacting with other molecules on the surface The transition metals most frequently used in catalysts belong to the groups to 11, and particularly the group 11 transition metals ... Various metals and metal oxides including group 11 transition metals have been applied in oxidation reactions [21] Table 1-3 lists several oxidation reactions that have been catalysed by group 11 metals...

Ngày tải lên: 09/09/2015, 10:14

... the thesis work, transition- metal- oxide-based nanostructures, manganese dioxide nanostructures, ruthenium oxide nanotubes, as well as composite materials consisting of transition metal oxide and ... exhibiting the potential application as a supercapacitor electrode 2.2.3 Transition- metal- oxide-based materials A number of transition metal oxides with various oxidation states represent a type of attractive ... TRANSITION- METAL- OXIDE-BASED NANOSTRUCTURES AS SUPERCAPACITOR ELECTRODES ZHANG JINTAO (M Sci Shandong...

Ngày tải lên: 09/09/2015, 18:57

... Introduction Scheme 1.1: Non -Metal- Mediated preparation of aryl sulfides   Chapter 1: General Introduction 1.2 Transition metal- catalyzed cross-coupling reactions The use of transition- metals as catalysts ... compounds resulted in Chapter 269 Summary vi Development of Transition- Metal- Catalyzed C—S and C—C Cross-Coupling Reactions SUMMARY The transition- metal- catalyzed carbon-carbon and carbon-heteroatom ... development of transition metal catalyzed cross-coupling reactions, we have developed two novel and important synthetic methods for C―C cross-coupling reactions through the use of transition- metal- catalyst...

Ngày tải lên: 10/09/2015, 15:50

... their own oxides such as RuO2, RhO2 and Rh2O3 show metallic conductivity or semimetal property, while other metal oxides containing 4d transition metal ions 31 Chapter such as BaMoO3, SrMoO3, SrRuO3, ... regarding doping 4d transition metals including Ru, Rh and Nb into LiNi0.5Mn1.5O4 In comparison with 3d orbitals, the 4d orbitals with larger radius of the second row transition metal ions overlapping ... lithium batteries are named as lithium ion batteries Meanwhile, the transition metal chalcogenide cathodes were replaced by transition metal oxides cathode which can provide higher voltage for lithium...

Ngày tải lên: 10/09/2015, 15:52

... reactions Transition metal complexes of benzoxazolin-2-ylidenes have also been prepared solely by this metal template directed synthesis.29 (e) Oxidative addition of an azolium salt to a low-valent metal ... since late 1960 in the transition metal chemistry of phosphines A 17 Chapter pioneering work by Beck and co-workers in 1966, has given the first example of transition metal complexes of phosphines ... as bridging ligands leading to bimetallic54 or heterobimetallic complexes.55 Kim and co-workers have made a significant contribution to the study of transition metal complexes of phosphines with...

Ngày tải lên: 11/09/2015, 10:04

... both the doped transition- metal ions and host materials Now, the electronic energy levels of these transition- metal- doped ZnSe are clearly understood In summary, when transition metals such as ... by the introduction of new doping and defect energy levels by the incorporated transition metal ions Transition metal doping provided an option to manipulate MPA cross-sections, in addition to ... ZnSe/ZnS QDs doped with transition- metal ions a promising candidate for applications based on three-photon-excited fluorescence Lastly, we have shown that the transition- metal- doping greatly enhanced...

Ngày tải lên: 11/09/2015, 10:06

... many reviews on homogeneous catalysts with various transition metals.2 For transition metals, the d-orbitals present allow ligands such as hydrides, CO, and alkenes to be bound in such a way ... ideas and offering encouragement xvii Chapter Chapter – General Introduction 1.1 Transition metal catalysts Transition metal catalysts have been long used in industries and laboratories ranging from ... activated by a transition metal in homogeneous catalysis, prior coordination/interaction of the reactant to the metal centre is necessary.1c A loose coordination of the reactants to the central metal...

Ngày tải lên: 11/09/2015, 10:18

... with the metals as it could perform dual function, viz monodentate and chelating Table 5.6: Effect of metal precursor towards 1,2 –addition of phenylboronic acid to benzaldehyde.a Entry Metal Precursor ... manifested in chelate dissociation and halide-bridge formation, thus reducing the metal sphere congestion promoting metalsubstrate interaction Indeed, a significant increase in the cross coupling ... carbinols Owing to the mild reaction conditions involved in the absence of water- and air-sensitive metal hydrides and pressurized hydrogen gas, it is also an attractive alternative to current catalytic...

Ngày tải lên: 11/09/2015, 10:18

... Technology Self-aligned formation is the common feature of transition- metal silicides Table 1.1 lists some key properties of transition- metal silicides 41, 42 Among the silicides, the use of platinum ... annealing The unreacted metal is thereafter removed by selective wet etch which etches metal much faster than silicides The essence of the salicidation process is that only the metal in contact with ... maintaining complex alloy 25 Chapter Experimental and Computational Methodologies compositions, (3) the capability of depositing high-melting-temperature metals (like refractory metals), (4) the...

Ngày tải lên: 12/09/2015, 11:01

... Introduction…………………………………………………………1 1.1 Evolution of CMOS Technologies……………………………………1 1.2 Transition- Metal Silicides……………………………………………7 1.3 Objective and Scope…………………………………………………17 References……………………………………………………………19 ... Future Work………………………………………………………175 Publication List……………………………………………………………………177 iv Summary Transition- metal silicides are self-aligned to Si with low resistivity, good adhesion, and self-passivation ... yellow balls while metal atoms are represented by the blue balls Figure 5.3 (a) Side view and (b) top view of the sevenfold-R and sevenfold-Z interface structures For easy reference, metal atoms at...

Ngày tải lên: 13/09/2015, 20:19

... between transition- metal atoms, Si(001), and nanotubes 1.3.1 Interactions of transition- metal atoms with Si(001) Transition- metal silicides, especially 3d TM silicides, are of great importance as metallic ... 1.3 Interactions between transition- metal atoms, Si(001), and nanotubes 1.3.1 Interactions of transition- metal atoms with Si(001) 1.3.2 Interactions of transition- metal atoms with nanotubes ... polysilicon, which is usually alloyed with high temperature metals (Ti, Co, Ni, etc.) to enhance the conductivity The metallic contacts of the source/drain currently use transition- metal (TM) silicides...

Ngày tải lên: 14/09/2015, 11:15

... of the metal oxides, including SnO2, In2O3, and ZnO Deviations in the properties of metal oxides due to the adsorption of specific gases render them as potential gas sensors Transition metal oxides, ... liquid ф Work function xv Chapter Introduction to Metal Oxide Nanostructures Chapter Introduction to Metal Oxide Nanostructures 1 Introduction Metal oxides have numerous technological applications ... direct growth of oxide nanostructures on metal foils is studied Our results revealed that, the direct growth of metal oxide nanostructures on respective metal foil is governed by a diffusion controlled...

Ngày tải lên: 14/09/2015, 14:11

... dibenzotetraazafulvalenes with transition metals Lappert and coworkers demonstrated that electron-rich enteraamines or dibenzotetraazafulvalenes can be cleaved by coordinatively unsaturated electrophilic metal complexes ... reported for group 10 metals However, Abernethy and Cowley recently reported a similar but more pronounced behavior of chloro ligands in the high-oxidation-state transition- metal complexes [V(O)Cl3(NHC)] ... The reaction of an azolium salt with a suitable metal complex This method involves in situ deprotonation of azolium salts in the presence of a metal complex with a basic ligand such as Pd(OAc)2...

Ngày tải lên: 14/09/2015, 14:12

... TRANSITION METAL AND RARE EARTH DOPED STOICHIOMETRIC LITHIUM NIOBATE CRYSTALS FOR HOLOGRAPHIC RECORDING ... to increase sensitivity [67], like, by using UV preilluminated crystal [6], doping with new transition metals / rare-earth elements [79,84,90,98,99] or applying large electric fields [128] Luennemann ... to test various doped SLN (stoichiometric lithium niobate) crystals Out of the long list of transition metal and rare earth dopants (Fe, Cu, Ce, Mn, Tb, Mg, Pr, In and Ru) [40, 49, 84, 91 – 98]...

Ngày tải lên: 16/09/2015, 17:13