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Saturday, July 25, 2020 | History

2 edition of nuclear quadrupole resonance study of nitrogen containing compounds. found in the catalog.

nuclear quadrupole resonance study of nitrogen containing compounds.

Ching-Hsiang Chen

nuclear quadrupole resonance study of nitrogen containing compounds.

by Ching-Hsiang Chen

  • 174 Want to read
  • 32 Currently reading

Published .
Written in English

    Subjects:
  • Nitrogen compounds.,
  • Chemical bonds.

  • The Physical Object
    Paginationviii, 53 l.
    Number of Pages53
    ID Numbers
    Open LibraryOL16724301M

    Nuclear magnetic resonance (NMR) has been widely used in the context of quantum information processing (QIP). However, despite the great similarities between NMR and nuclear quadrupole resonance (NQR), no experimental implementation for QIP using NQR has been reported. Nuclear magnetic resonance (NMR) is a physical observation in which nuclei in a strong constant magnetic field are perturbed by a weak oscillating magnetic field (in the near field and therefore not involving electromagnetic waves) and respond by producing an electromagnetic signal with a frequency characteristic of the magnetic field at the nucleus.. This process occurs near resonance, when.

    Elemental nitrogen is a colorless, odorless, tasteless and mostly inert diatomic gas at standard conditions, constituting 78% by volume of Earth's atmosphere. Nitrogen occurs in all living organisms. It is a constituent element of amino acids and therefore of proteins and nucleic acids (DNA and RNA). Nitrogen is found in the chemical structure of almost all neurotransmitters and is a key. Polarizability constant of iodine as substituent in correlation analysis Yu. A. Kurskii et al Russian Journal of General Chemistry87 Crossref. NQR parameters of complex.

    Nuclear quadrupole resonance spectroscopy (NQRS) is an analytical method which, among others, is sensitive to the crystallographic state of compounds which contain quadrupolar nuclei (QN), that is, nuclei with a spin quantum number >1/2 which possess a non-spherical electricalAuthor: Hermann Scharfetter, Roland Fischer, Paul Krassnig, Martin Thonhofer, Felix Theyer, Christian Göswei. Technical Report: Low-frequency nuclear quadrupole resonance with a dc SQUID. Low-frequency nuclear quadrupole resonance with a dc SQUID. Full Record; Other Related Research.


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Nuclear quadrupole resonance study of nitrogen containing compounds by Ching-Hsiang Chen Download PDF EPUB FB2

Yet, in Comprehensive Heterocyclic Chemistry III, Structure and Reactivity of Indazoles. Nuclear quadrupole resonance (NQR) frequencies were determined on the 35 Cl isotope for several chloroindazoles and for two chloroindazole nucleosides at liquid nitrogen influence of the site of substitution and type of substituent on the resonance.

Nuclear quadrupole resonance spectroscopy or NQR is a chemical analysis technique related to nuclear magnetic resonance ().Unlike NMR, NQR transitions of nuclei can be detected in the absence of a magnetic field, and for this reason NQR spectroscopy is referred to as "zero Field NMR."The NQR resonance is mediated by the interaction of the electric field gradient (EFG) with the quadrupole.

Search within book. Front Matter. PDF. Crystal field effects in nuclear quadrupole resonance. Alarich Weiss. Pages Nuclear Quadrupol Wellen crystal lens magnetic resonance nitrogen nuclear magnetic resonance nuclear magnetic resonance (NMR) spectroscopy.

Bibliographic information. The nuclear quadrupole resonance of 14 N in ethylamine, n-propylamine, isopropylamine, n-butylamine, and tert-butylamine were nuclear quadrupole resonance study of nitrogen containing compounds.

book at liquid nitrogen ethylamine, the temperature dependence of resonance frequencies was measured, and a phase transition was found at ° by: 6. In book: Encyclopedia of Spectroscopy and Spectrometry (pp) NUCLEAR QUADRUPOLE RESONANCE. APPLICATIONS. phase of many nitrogen-containing ni trogen compounds.

Analysis of. Figure 3. Common explosive compounds each produce a unique set of spectral lines when investigated for nuclear quadrupole resonance. The fre-quencies of almost all of those lines depend on the chemical environment of the nitrogen atoms contained in these compounds and on their crystal-line Size: KB.

Based on the14N NQR data, the pπ − dπ interaction in dimethylaminosilanes is weaker than in the amides of phosphorus by: Abstract Nuclear quadrupole resonance of 14 N(I=1) has been studied for the two diatomic species 14 N N and 14 N N in solid α-nitrogen.

Spectra from carefully prepared and annealed samples display well-resolved intramolecular dipolar splittings consisting of an asymmetric triplet for 14 N N and a doublet for 14 N N.

From the order of the components of the triplet, the sign of the. Nuclear quadrupole resonance (NQR) is a spectroscopic technique that can detect explosives with high chemical specificity and therefore it is very suitable for the landmine detection problem. Abstract Numerous ionic compounds containing the guanidinium ion have been investigated by means of nitrogen nuclear quadrupole resonance techniques.

The nitrogen resonance spectrum of the amino groups of the quanidinium ions yielded, with a few exceptions, an average e 2 qQ/h = kHz and an average asymmetry parameter η = The 14 N nuclear quadrupole resonance spectra have been used to check whether the cocrystals are indeed formed and to investigate the hydrogen bonding scheme of 2,3,5,6-tetramethylpyrazine molecules.

Since a 2,3,5,6-tetramethylpyrazine molecule has two hydrogen bond acceptors, it may form either or cocrystals with carbocylic acids. Nuclear Quadrupole Resonance Spectroscopy Review nuclear quadrupole moments, Q – A negative value for Q denotes a distribution of charge that is "football-shaped", i.e.

a sphere elongated at the poles; a positive value corresponds to a flattened sphere.] Some examples of nuclear quadrupole moments Nucleus I Q /m2 2H 1 x 14N 1 1 File Size: 26KB. We have measured temperature dependences of 14N nuclear quadrupole resonance (NQR) frequencies and proton T1 in 2-methylbenzimidazole and 5,6-dimethylbenzimidazole.

The NQR frequencies are assigned to amino and imino nitrogen positions. The NQR data exclude the possibility of proton two-site exchange in an N–HN hydrogen by: 6.

Introduction. Nuclear quadrupole resonance (NQR) spectroscopy is a method to characterize chemical compounds containing quadrupolar nuclei (QN). Similar as in nuclear magnetic resonance (NMR) the sample under investigation is irradiated with strong radiofrequency (RF) pulses to induce and detect transitions between sublevels of nuclear ground states [1] [2].

This option allows users to search by Publication, Volume and Page Selecting this option will search the current publication in context. Selecting this option will search all publications across the Scitation platform Selecting this option will search all publications for the Publisher/Society in contextCited by: A selective absorption phenomenon observable in a wide variety of polycrystalline compounds containing nonspherical atomic nuclei when placed in a magnetic radio-frequency field.

Nuclear quadrupole resonance (NQR) is very similar to nuclear magnetic resonance (NMR), and was originated in the late s by H.

Dehmelt and H. Krüger as an Author: Hans G. Dehmelt. Nuclear Quadrupole Resonance (NQR) spectroscopy has been known for 70 years. It is suitable for the study of measured (poly)crystalline chemical compounds containing quadrupole nuclei (nuclei with spin I ≥ 1) where the characteristic NQR frequencies represent the fingerprints of these compounds.

In several cases, 14N NQR can distinguish between the polymorphic crystalline phases of active. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

Solid‐state nuclear magnetic resonance (SSNMR) spectroscopy has largely overtaken nuclear quadrupole resonance (NQR) spectroscopy for the study of quadrupolar nuclei.

In addition to information on the electric field gradient, SSNMR spectra may offer additional information concerning other NMR interactions such as magnetic by: 6. Nitrogen compounds have a very long history, ammonium chloride having been known to were well known by the Middle Ages.

Alchemists knew nitric acid as aqua fortis (strong water), as well as other nitrogen compounds such as ammonium salts and nitrate salts. The mixture of nitric and hydrochloric acids was known as aqua regia (royal water), celebrated for its ability to dissolve Group: group 15 (pnictogens).

Nitrogen‐14 nuclear quadrupole resonance (NQR) spectra of 26 C–nitro compounds are reported and analyzed in the framework of the Townes and Dailey theory.

Six different possibilities for the principal axis system of the electric field gradient (efg) tensor at the nitrogen of the NO 2 group are considered. The results lead to the conclusion that the z direction of the principal axes is in Cited by: "Man portable mine detector using nuclear quadrupole resonance - first year progress and test results".

Second International Conference on the Detection of Abandoned Land Mines. Edinburgh, Scotland. October[48] A.D. Hibbs. "In-Situ Real Time Detection of Explosive-Chemical Compounds in Mines Using Nuclear Quadrupole Resonance (NQR)".System Upgrade on Feb 12th During this period, E-commerce and registration of new users may not be available for up to 12 hours.

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