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Complexation of neutral and cationic scandium(III) species with macrocyclic ligands

Paul R. Meehan

Complexation of neutral and cationic scandium(III) species with macrocyclic ligands

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Published by typescript in [s.l.] .
Written in English


Edition Notes

Thesis (Ph.D.) - University of Warwick, 1996.

StatementPaul R. Meehan.
ID Numbers
Open LibraryOL16538095M

  What is Chromium? Chromium is a chemical element with atomic number 24 and represented by the symbol Cr in the Periodic Table. Chromium is a lustrous, hard metal that has a silver-grey color. It has a high melting point. The electron configuration of chromium is [Ar]3d 5 4s 1, which can be explained by the stability offered by a half-filled d Atomic Mass:   Abstract. The suitability of 46 Sc as a nonabsorbed reference material for cattle was investigated by simultaneous within-animal comparison with Ce which has previously been used for this purpose. Excretions and tissue distributions of 46 Sc and Ce were compared in six calves and twelve mature cattle. Tracer levels of both nuclides were given to Cited by: The scandium and yttrium complexes supported by tridentatephosphido-diphosphine ligands shown in Figure 30 have been studied as initiators for the ROP of lactide. The yttrium complexes exhibited high activity and good polymerization control, while the analogous scandium complexes gave a good molar mass control but lower activities.


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Complexation of neutral and cationic scandium(III) species with macrocyclic ligands by Paul R. Meehan Download PDF EPUB FB2

Optimized geometries (distances in Å and angles in degree) of cationic half-sandwich scandium alkyl species 2a, 2b, and 2c. Reprinted with permission from Complexation of neutral and cationic scandium book.

Kang, G. Zhou, X. Wang, J. Qu, Z. Hou, Y. Luo, Y. Alkyl effects on the chain initiation efficiency of olefin polymerization by cationic half-sandwich scandium catalysts: A DFT : Xiaohui Kang, Xiaohui Kang, Yi Luo, Zhaomin Hou. Neutral and cationic Fe(II) β-diketiminate complexes.

(C6F5)(3), gives an ion pair, 4, in which the cationic scandium center is stabilized by a eta(6)-aryl interaction with the abstracted. Biochemistry of Scandium and Yttrium gathers together existing knowledge about scandium and yttrium from a wide variety of disciplines.

Part 2 addresses the biochemical aspects of these two elements, and the various medical and environmental applications. (Part 1 presents a comparative study of the physical and chemical properties of scandium and yttrium, looking at.

Nomenclature of Coordination Complexes Rule 1: The names of neutral coordination complexes are given without spaces. For coordination compounds that are ionic (i.e., the coordination complex Complexation of neutral and cationic scandium book either an anion or anion of an ionic substance), the cation is named first and separated by a space from the anion, as is the case for all ionic Size: 21KB.

Sc – Scandium Introduction Scandium belongs to group 3 of the periodic table, along with Y, La and Ac. The element has an atomic number Complexation of neutral and cationic scandium book 21, an atomic mass of 45, one oxidation state (+3) and one naturally occurring isotope (45Sc).

Its geochemistry is quite distinct from the heavier group 3 members. Scandium has a dispersed lithophile behaviourFile Size: KB. Cationic Aluminum(III): Structural and Reaction Features.

Neutral Aluminum(III): Coordination Aptitude and Molecular Recognition. Other Novel Interactions Involving Neutral Aluminum(III) Ligand Effect on Aluminum(III) Geometry and Interactions. Modern Aluminum Reagents in Selective Organic SynthesisCited by: 5. CB[n] has thus been studied in complexation with neutral or cationic molecules (mostly amines and amine derivatives) through supramolecular interactions or host-guest inclusions (Scheme 1).

Reaction of scandium with air. Scandium metal tarnishes in air and burns readily to form scandium (III) oxide, Sc 2 O 3.

4Sc + 3O 2 → 2Sc 2 O 3. Reaction of scandium with water. When finely divided, or heated, scandium metal dissolves in water to form solutions containing the aquated Sc(III) ion together with hydrogen gas, H 2. Scandium is a chemical element in the periodic table that has the symbol Sc and atomic number A soft, silvery, white transition element, scandium occurs in rare minerals from Scandinavia and it is sometimes classified along with yttrium and the lanthanides as a rare earth.

Compounds of Scandium, Yttrium, Lanthanum and Actinium Simple compounds (6) The oxides, M 2 O 3, are white solids which can be prepared directly from the elements.

In Sc 2 O 3 and Y 2 O 3 the metals are 6-coordinate but the larger La III ion adopts this structure only at elevated temperatures, a 7-coordinate structure being. This article Complexation of neutral and cationic scandium book one of a number of reviews in the special issue of the Journal of Inorganic and Organometallic Polymers and Materials, celebrating the 50th anniversary of the discovery of metallocene-based Complexation of neutral and cationic scandium book.

Since the first examples of polyferrocenes inresearch into the design of organometallic polymers has grown exponentially. Organoiron Cited by: Image showing periodicity of valence s-orbital radius for the chemical elements as size-coded balls on a periodic table grid.

References. The R max values for neutral gaseous element valence orbitals are abstracted from reference J.B. Mann, Atomic Structure Calculations e-Fock wave functions and radial expectation values: hydrogen to lawrencium, Complexation of neutral and cationic scandium book.

Scandium Scandium is the first element in Group 3 of the periodic table. It has an atomic number of 21, an atomic mass ofand a chemical symbol of. Biochemistry of Scandium and Yttrium gathers together existing knowledge about scandium and yttrium from a wide variety of 1 will present a comparative study of the physical and chemical properties of scandium and yttrium, looking at both their similarities and their differences.

(Part 2 will address the biochemical aspects of these two elements, and the Author: Chaim T. Horovitz. The crystal structures of two trisiodide octacoordinated uranium(III) complexes of tris[(2-pyrazinyl)methyl]amine (tpza), which differ only by the ligand occupying the eighth coordination site (thf or MeCN), and of their lanthanum(III) analogues have been determined.

In the acetonitrile adducts the M−Npyrazine distances are very similar for U(III) and La(III), while the Cited by: Our scandium page has over facts that span 86 different quantities.

Each entry has a full citation identifying its source. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature.

The Differences Between Anionic and Cationic Single Replacement In cationic replacement, a cation reacts with an ionic molecule composed of an anion and cation and, again, a switch takes places, with the new cation replacing the old cation. In both cases, the result is a new ionic molecule and the release of the species that was replaced.

Sc has electronic configuration: [Ar] 3d1 4s2 Sc 2+ will’ve electronic configuration: [Ar] 3d1 The configuration with a single electron residing in the 3d orbital is found to be very unstable, Hence Sc Readily loses an electron to achieve noble. A coordination complex consists of a central atom or ion, which is usually metallic and is called the coordination centre, and a surrounding array of bound molecules or ions, that are in turn known as ligands or complexing agents.

Many metal-containing compounds, especially those of transition metals, are coordination complexes. A coordination complex whose centre is a metal. Scandium is an element with the atomic number 21 and represented with the symbol ‘ Sc ‘ in the periodic table.

Scandium is mined from one of the rare minerals from Scandinavia. The colour it develops when exposed to air is yellowish or pinkish cast. One of the characteristics of Scandium is it gets tarnished and burned easily if Number: Abstract.

Yttrium has major similarities to scandium and also to the lanthanides (Ln). Their treatment together and comparing their chemical and physical properties with those of other metals presents the aim of this : Chaim T.

Horovitz. Cationic polymerization has a long history, and the first research into cationic polymerization on record was conducted in the late 18th century. Since then, polymerization reactions of various monomers (Figure 1) have been examined, for which numerous types of Cited by: Stabilities of Complexes of Scandium(III) and Yttrium(III) With Salicylic Acid Naciye TURKEL, Rahmiye AYDIN, U.¨ OZER¨ Department of Chemistry, Faculty of Arts and Sciences, Uluda g UniversityBursa-TURKEY Received The interactions of Sc(III) and Y(III) ions with salicyclic acid, SA (H 2L), were studied in aqueous.

By using the same ligand, 2,5-furandicarboxylic acid (FDA), and varying synthetic conditions (especially the In3+/FDA ratio), it is possible to access three unique building blocks of indium, demonstrating charge-switching from a positive trimer to a negative monomer and leading to the synthesis of In-MOFs wiCited by: Scandium triiodide, also known as scandium iodide, is an inorganic compound with the formula ScI 3 and is classified as a lanthanide is a yellowish powder.

It is used in metal halide lamps together with similar compounds, such as caesium iodide, because of their ability to maximize emission of UV and to prolong bulb al formula: I₃Sc. Scandium (Sc) Energy Levels of Neutral Scandium (Sc I) Configuration: Term: J: Level(cm-1): Ref.

3d4s 2: 2 D: 3/2: SC 5/2: Book chapter in prepration. Scandium, Zirconium, and Niobium Complexes Supported by the Pincer Ligand.

Cationic and Neutral Four-Coordinate Alkylidene Complexes of Favorable Consequences of beta-Hydrogen Elimination Including Reductive Cleavage, Coupling and Complexation, Yi-C.

Tsai, Marc J. Johnson, Daniel J. Mindiola, W. Chemical reactions for scandium. Reaction of scandium with air. Scandium tarnishes in air, and burns readily, forming scandium(III) oxide, Sc 2 O 3. 4 Sc (s) + 3 O 2 (g) 2 Sc 2 O 3 (s).

Number of Energy Levels: 4: First Energy Level: 2: Second Energy Level: 8: Third Energy Level: 9: Fourth Energy Level: 2. (1) Adsorption of cationic rhodium complexes is a time-dependent and solvent-dependent phenom- enon.

At short contact times (, sec) there is, within experimental accuracy, a one-to- one correspondence between the amount of Na + released into the solution and the amount of Rh +. cationic metal complexes (MC) instead of guanidinium cations The idea is to replace two guanidinium cations from two layers with a cationic octahedral metal complex with ligands that can provide protons for hydrogen bonding such as ammonia, water, and various ammines, As a result, two neighboring layers of guanidinium.

The highly Lewis acidic, cationic aluminum species [DIPP-nacnacAlMe]+[B(C6F5)4]− (1, DIPP-nacnac = [HC{C(Me)N(2,6-iPr2C6H3)}2]−) has been shown to undergo reactions with a wide variety of small molecules, in both the presence and absence of an external weak phosphine base, PPh3.

Cycloaddition reactions of unsaturated C–C bonds across the aluminum. The electronic configuration of the cobalt is $\ce{[Ar] 3d^1 4s^2}$ the electrons with the higher energy will be snatched and the electronic configuration of Argon is very stable then with scandium you will have easely $\ce{Sc^{3+}}$.

The first example of the OCPPCO ligand, diisophosphaethynolate, is reported via reductive coupling of a Sc-OCP precursor. Upon reduction with KC8, isolation of the dinuclear complex, namely [K(OEt2)]2 [(nacnac)Sc(OAr)]2 (OCPPCO), is observed, leading to a unique motif [OCPPCO]4- stabilized by two scandium centers.

Detailed NMR spectra of all complexes as. why Scandium commonly makes a 3+ ion as opposed to a 2+ ion. Removing 3 electrons releases more energy than removing 2 electrons. Scandium is in Group 3, and atoms only lose the number of electrons that will result in a noble gas electron configuration c.

The amount of energy required to remove an electron from the 3d sublevel is closeFile Size: KB. Current approaches to achieve site selectivity in the C–H activation of arenes involve the use of directing groups or highly electron-poor arenes. In contrast, simple arenes, such as anisole, are characterized by poor reactivity and selectivity.

We report that π-complexation to a Cr(CO)3 unit enhances the reactivity of anisoles providing an unprecedented ortho-selective by: Since its discovery, scandium has been found only in several rare minerals.

It is found in highest concentration in the Norwegian mineral thortveitite (35–40% scandium). Its abundance in Earth's crust is a point of conjecture; it is generally agreed that scandium occurs in greater abundance in the Sun and certain stars.

You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them., Free ebooks since Cationic vesicles and DNA form complexes that are promising gene delivery systems.

Despite the increasing number of publications on their morphology and structure, the mechanism leading to their formation is not yet understood due to a lack of kinetic data. In the present study the kinetics of the interactioCited by: The extraction behavior of scandium ion (Sc3+) was investigated using 1-butylmethyl -imidazolium hexafluorophosphate ([Bmim]PF6­) ionic liquid as extraction solvent and 2-ethylhexyl phosphonic acidethylhexyl ester (P, HA) as extractant.

The extractablity of Sc3+ using [Bmim]PF6­ was less than 5% without P When the initial P concentration in IL phase Cited by: 3. Scandium: pdf only 3+? The setup: pdf 2+ oxidation state occurs commonly for nearly all metals in the first transition series.

A significant exception is scandium. Explain why scandium is an exception." My response: "Scandium forms the extremely stable Ar electron configuration when it loses 3 electrons, so the 3+ state is strongly favored.".Scandium will probably exist in the +2 and +1 download pdf, they are just not very stable (If anyone definitively knows, I will be very interested).

In the +1 state, it will have a stable filled 3s2 sub-shell and in the +2 state, it will have a stable(ish) half-filled 3s1 sub-shell.The Principles ebook Inorganic Chemistry, Second Edition predicates on an account of fundamental principles and their applications to the study of elements.

The comparative chemistry of inorganic compounds is discussed with special reference to periodicity.