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Sunday, April 19, 2020 | History

2 edition of NMR investigations on solutions and single crystals of alkali radical ion pairs. found in the catalog.

NMR investigations on solutions and single crystals of alkali radical ion pairs.

Gerardus Wilhelmus Canters

NMR investigations on solutions and single crystals of alkali radical ion pairs.

  • 241 Want to read
  • 23 Currently reading

Published by G. van Soest in Amsterdam .
Written in English

    Subjects:
  • Organometallic compounds.,
  • Ions.,
  • Nuclear magnetic resonance.

  • Classifications
    LC ClassificationsQD411 .C28
    The Physical Object
    Paginationviii, 143 p., 2 p. of photos.
    Number of Pages143
    ID Numbers
    Open LibraryOL4652850M
    LC Control Number77497577

    The crystals belong to the space group P2/sub 1/ /a, which permits the existence of mirror images in the solid state. Attempts to resolve the possible racemic pairs of these anions were unsuccessful. Oxalate exchange studies with C/sup 14/ containing oxalic acid showed that complete exchange occurred withth a few minutes time of the experiment. The U.S. Department of Energy's Office of Scientific and Technical Information. Abstract. The atomic masses of the alkali-metal isotopes {sup 6}Li,{sup 23}Na,{41}K,{87}Rb, and {sup }Cs have been obtained from measurements of cyclotron frequency ratios of pairs of ions simultaneously trapped in a Penning trap.


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NMR investigations on solutions and single crystals of alkali radical ion pairs. by Gerardus Wilhelmus Canters Download PDF EPUB FB2

Measure sign and magnitude of the spin density at the alkali nucleus in radical ion pairs by the NMR method in order to test the hypothesis of DE BOER about the sign and the sign reversal of this spin density.

According to a suggestion of VAN WILLIGEN and DE BOER the experiments should be performed, in analogy with the proton. Title: NMR investigations on solutions and single crystals of alkali radical ion pairs: Author(s): Canters, G.W.

Publication year:Author: G.W. Canters. NMR investigations on solutions and single crystals of alkali radical ion pairs. By G.W. Canters. Download PDF (8 MB) Abstract. Contains fulltext: mmubn_pdf (publisher's version) (Open Access)Promotor: E. de Boer cum laudeviii, p Author: G.W.

Canters. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link) ; http Author: G.W. Canters. anions diluted in single crystals 9 The g tensor 10 The hyperfine interaction 11 The nuclear Zeeman interaction 12 Nuclear magnetic resonance 14 Powders of alkali biphenyl 14 Powders of alkali cyclooctatetraene 15 CHAPTER 3 EXPERIMENTAL 17 Preparation of the alkali aromatic ion pairs OPTICAL AND NMR AND INVESTIGATIONS NITRANIONS ON ALKALI ION PAIRS OF CARBANIONS N.H.

Velthorst Department Amsterdam, of The Chemistry, Free University, De BoelelaanNetherlands Abstract - The ion pair formation of some cyclic conjugated carbanions and n i t r a n i o n s has been studied by a b s o r p t i o n and fluorescence by: 9.

This finding further supports the assumption of a π spin delocalization from the radical anion to the metal cation, as derived from the positive ENDOR metal couplings of radical ion pairs NMR investigations on solutions and single crystals of alkali radical ion pairs.

book solution. Another class of interesting single crystals of diamagnetic ion pairs is formed by the alkali complexes derived from cyclooctatetraene and its derivatives (7).

The crystal structures reveal that the alkali ions are located above the center of the planar eight-membered ring, at a Cited by: jor tools in the study of the alkali aromatic ion pairs [ 1U]. Only recently nuclear magnetic resonance (NMR) spectros­ copy has been used to study paramagnetic organic molecules I I6-I8].

The NMR of the various nuclei in the alkali aromatic ion pair provides detailed information [ ] about the elec­. Our attention was first focused on structurally characterizing transition-metal ion pairs in solution, by means of interionic NOE NMR studies, in an attempt to Cited by: Nuclear magnetic resonance of alkali elements is a very sensitive probe of the immediate chemical environment of an alkali ion in solutions and can be used to study ion-ion, ion-solvent and ion-ligand interactions.

Electron spin resonance investigation of o-chloranil alkali metal ion pairs. Journal of Magnetic Resonance ()21 (2), DOI: /(76) Viktor Gutmann.

Solvent effects on the reactivities of organometallic by: Although the smaller radical NMR investigations on solutions and single crystals of alkali radical ion pairs.

book may be stabilized in zeolitic matrices, they are usually formed in solution via disproportionation or partial dissociation of the dianions as well as by electrochemical reduction of elemental sulfur.

nuclear magnetic resonance study of single–crystal paratellurite 3-δ o 4 spinel solid solutions. nmr study of ionic conduction in the perovskite-type halides. production of ultra–thin alkali–cyanide single crystals and study of their phase–transitions by light scattering. Complexation of alkali-metal cations with calix[4]arene secondary-amide derivative, 5,11,17,tetra(tert-butyl),26,27,tetra(N-hexylcarbamoylmethoxy)calix[4]arene (L), in benzonitrile (PhCN) and methanol (MeOH) was studied by means of microcalorimetry, UV and NMR spectroscopies, and in the NMR investigations on solutions and single crystals of alkali radical ion pairs.

book state by X-ray crystallography. The inclusion of solvent molecules (including acetonitrile Cited by: Radical-Ion Pairs in Coloured Solutions. Observation of Transient trans-Azobenzene Radical Cation. Applied Magnetic Resonance 5(1) () 6. Song, O.N. Antzutkin, X. Feng and M.H.

Levitt*; Sideband Suppression in Magic-Angle-Spinning NMR by a Sequence of 5 p Pulses. Solid State Nuclear Magnetic Resonance 2 () 7.

ESR Studies of Naphthalene-alkali Metal Ion Pairs. The Effect of Alkali Ions on the Proton-coupling Constants and the Structure of the Ion Pairs. Bulletin of the Chemical Society of Japan41 (3), DOI: /bcsj Günter Häfelinger, Andrew by: The influence of polar solvents on ions and ion pairs in the anionic polymerization of styrene.

European Polymer Journal11 (2), DOI: /(75) P. Sigwalt. Reactivities of free ions and ion pairs in anionic by: 8. Solvent-shared radical ion pairs [Pyrene.⊖Na⊕O(C2H 5)2]∞: ESR evidence for two different aggregates in solution, room temperature crystallization, and structural proof of another.

The most important part of the study is the magnetic field-dependence of the quantum yield of the radical-pairs and can be summarized as: (i) Cited by: 3.

Although the NMR data of hydrogen-bond scalar couplings (h3JNP) between protein 15 N and DNA 31 P nuclei indicate the presence of hydrogen bonds in the intermolecular ion pairs, the NMR S2 and 3JNC data clearly indicate that the Lys side chains interacting with DNA phosphates are highly mobile.

Stability of Like and Oppositely Charged Organic Ion Pairs in Aqueous Solution. 13 C NMR/DFT/IGLO Study of Benzylic Mono- and Dications, Intrinsic and Environmental Effects in the Structure and Magnetic Properties of Glycine Radical in Aqueous Solution. The bonding interactions within organoalkali metal complexes of the heavier alkali metals are generally considered to be strongly electrostatic or ionic in nature.

This is supported by a large collection of evidence, consisting primarily of solution NMR data, single-crystal X-ray analyses, Author: Melanie Harvey. To ensure this, the reactions of 2-hydroxymethyl-1,4-naphthoquinone (phthiocol, a vitamin K3 analogue) with sodium metal, alkali such as NaOH and KOH, and alkali metal salts such as CH 3 COONa, Na 2 CO 3 and K 2 CO 3 were studied in the present by: 1.

The compounds comprising ions of alkali metals and “carbanions” are present in solution as monomeric or aggregated contact ion pairs, or solvent‐separated ion pairs. The gegenion thus changes the electronic and spatial structure of the anion by charge‐localization and pyramidalization.

A novel type of catalysts useful in the anionic polymerization processes is demonstrated. Alkali metal ion pairs, e.g. K+crown ether, K− discovered first by Dye and Edwards were modified and. Abe J, Sano T, Kawano M, Ohashi Y, Matsushita MM, Iyoda T () EPR and density functional studies of light-induced radical pairs in a single crystal of a hexaarylbiimidazolyl derivative.

Angew Chem Int Ed – CrossRef Google ScholarCited by: 1. The Temperature Dependence of Chemical Shifts of Individual Peaks in the 13C NMR Spectrum of the Fullerite C60, Doped with Molecular Oxygen (NMR) investigations of the alkali fullerides and of.

Radical-Ion Pairs in Coloured Solutions. Observation of Transient trans-Azobenzene Radical Cation. Applied Magnetic Resonance 5(1) () 6. Song, O.N. Antzutkin, X. Feng and M.H.

Levitt*; Sideband Suppression in Magic-Angle-Spinning NMR by a Sequence of 5 π Pulses. Solid State Nuclear Magnetic Resonance 2 () 7. Ion pairs (also known as salt bridges) of electrostatically interacting cationic and anionic moieties are important for proteins and nucleic acids to perform their function.

Although numerous three-dimensional structures show ion pairs at functionally important sites of biological macromolecules and their complexes, the physicochemical properties of the ion pairs are not well by: the application of nmr and neutron scattering to the study of quantum motion clough s.

10 contribution of electron-nuclear multiple resonance to the characterization of primary products in photosynthesis mobius k. 12 esr of short lived radical pairs in solutions molin y.n. 14 probing platinum surfaces with nmr. Herein we are reporting the structure investigations of two derivatives of salen ligand based organouranyl mononuclear complexes [UO 2 (L)THF] (1) and [UO 2 (L)Alc] (2) supported by single crystal X-ray diffraction measurements and various spectroscopic studies.

Furthermore, to make a deeper understanding, a comprehensive computational study on Cited by: 7. In protein–nucleic acid interactions, the predominant ion pairs are formed between DNA or RNA phosphate groups and protein side-chain arginine (Arg) NηH 2 groups or lysine (Lys) NζH 3+ groups.

Although NMR spectroscopy is extremely powerful for atomic Cited by: In this review on advanced biomolecular EPR spectroscopy, which addresses both the EPR and NMR communities, considerable emphasis is put on delineating the complementarity of NMR and EPR regarding the measurement of interactions and dynamics of large molecules embedded in fluid-solution or solid-state environments.

Our focus is on the characterization of protein structure, dynamics and Cited by: 3. The influence of alkali cation (M = Na or K) on the alkaline activation of fly ash and slag are evaluated. NaOH, KOH (4M and 8M), or Na or K silicates (SiO 2 /M 2 O = ) are used as the activators for fly ash systems which are then heat-cured, while Na or K silicates (SiO 2 /M 2 O = and ) are used to activate slag systems, which are then cured in ambient by: 1.

Rapid intermolecular acid–alcohol hydrogen‐bonded proton exchange and geometrical disorder, well below the melting temperature, form the basis of the observed amorphous behavior of salicyl salicylate nd 1 was observed in a stable, undercooled amorphous phase by 1 H and 13 C NMR spectroscopy, and its crystal structure was determined by single‐crystal X‐ray diffraction.

Remarkably, we found that exhaustive reduction of the tris-COT isocyanurate in THF generates the first-ever observed hexa-anion of an isocyanurate. NMR analysis revealed that each of the three planar D 8h COT dianion moieties form tight ion pairs with two counter K + ions (6).

1-Naphthyl Isocyanate (1-NapNCO). As described above, my group has. We report a multinuclear solid-state (23Na, 39K, 87Rb, Cs) NMR study of tetraphenylborate salts, M[BPh 4] (M) Na, K, Rb, Cs).

These compounds are isostructural in the solid state with the alkali metal ion surrounded by four phenyl groups resulting in strong cation-π interactions. From analyses of solid-state NMR spectra. Zn 4 O(BDC) 3, also called MOF-5, is a metal-organic framework in which 1,4-benzenedicarboxylate (BDC) anions bridge between cationic Zn 4 O clusters.

The rigid framework contains large voids, represented by orange spheres. MOFs can be made from many different transition metal ions and bridging ligands, and are being developed for practical applications in storing gases.

Which of the following is an incorrect description of benzene. A) The CCC bond angles are all equal to °. B) The molecule is planar. C) The molecule is a 6-membered ring which contains alternating single and double carbon-carbon bonds.

Crystals, an international, peer-reviewed Open Access journal. Los Alamos National Laboratory, Theoretical Division. T-1,Physics, and Chemistry of Materials, Los Alamos NMUnited States.The radical ions that have been postulated as intermediates in the Diels‐Alder reaction could be detected spectroscopically in the reaction of the diene 1 with tetracyanoethylene (TCNE).

The radical ion pair 2 is also formed when the adduct 3, which precipitates as colorless crystals from a deep‐colored solution.Ions and Ion Pairs and ebook Role in Chemical Reactions covers a wide spectrum of ion pairing phenomena.

This book focuses on the structure, dynamics, and energetics of ions and ion pairs and their complexes with solvent molecules and ion coordinating ligands in .