Chapter 4 Analyses of Proton NMR Spectra of Strongly and Weakly Dipolar Coupled Spins: Special Emphasis on Spectral Simplification, Chiral Discrimination, and Discerning of Degenerate Transitions

Baishya, Bikash; Prabhu, Uday Ramesh; Suryaprakash, N.

doi:10.1016/s0066-4103(09)06704-0

Cited by 17 publications

(5 citation statements)

References 167 publications

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“…A further interesting aspect is to obtain information on the molecular orientation of small molecules embedded in a liquid crystalline medium. Several excellent reviews showcase nicely how advanced 2D NMR spectral methods can be brought to bear on this challenging problem (Baishya et al, 2009;Kumar, 2010;Kumar and Suryaprakash, 2010). As a particular example, we showcase in Figure 8 spectral data from ref.…”

Section: Liquid-state Nmr In Materials Sciencementioning

confidence: 83%

“…As a particular example, we showcase in Figure 8 spectral data from ref. Baishya et al (2009) for the system 1-iodopropane in the liquid crystal solvent ZLI-1132. The individual proton chemical shifts of 1-iodopropane differ in an anisotropic medium compared to in a regular isotropic solvent such as chloroform and need to be determined first before further elucidating the molecular alignment with other NMR spectroscopic techniques.…”

Section: Liquid-state Nmr In Materials Sciencementioning

confidence: 99%

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Nuclear Magnetic Resonance: Basic Principles and Liquid State Spectroscopy

Hoffmann

2012

Characterization of Materials

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Thermogravimetric analysis (TGA) is an analytical technique for measuring changes in the mass of a material that occur in response to programmed temperature changes. The changes in the mass can be caused by a variety processes such as decomposition, degradation, sublimation, vaporization, adsorption, desorption, oxidation, and reduction. The article explains the principles of TGA and practical aspects of the method that include description of the apparatus, discussion of experimental variables, and applications. Among practical applications, a particular attention is paid to determining composition and thermal stability of materials, evaluating the kinetics of thermally stimulated processes, predicting lifetimes, and studying reactions of materials with gases. The article also addresses the issues of sample preparation as well as of basic analysis and interpretation of data. A special consideration is given to the sources of errors in the mass and temperature measurements as well as to the methods of calibrating both values.

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Section: Liquid-state Nmr In Materials Sciencementioning

confidence: 83%

Section: Liquid-state Nmr In Materials Sciencementioning

confidence: 99%

Nuclear Magnetic Resonance: Basic Principles and Liquid State Spectroscopy

Hoffmann

2012

Characterization of Materials

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“…92 Various aggregates, such as spherical and elongated micelles, tubular and rodlike aggregates, as well as vesicles, are induced by adding sodium 2-naphthalenesulfonate (SNphs) or sodium benzenesulfonate (SBzs). However, SNphs and SBzs cannot induce similar aggregate transitions for the systems of C12CsC12(Me) (s = 6,8,12). The possible mechanism of these phenomena is proposed based on the results of UV spectra and 1 H NMR measurements.…”

Section: Thermotropic Liquid Crystalsmentioning

confidence: 94%

“…Recently developed multidimensional NMR experiments to enlarge the information obtainable by this approach have been reviewed. 7,8 DOSY is a powerful technique for mixture analysis, but in its basic form it cannot separate the component spectra for species with very similar diffusion coefficients. This limitation can be overcome by the addition of a co-solute such as a surfactant.…”

Section: Introductionmentioning

confidence: 99%

NMR of liquid crystals and micellar solutions

D’Errico¹,

Paduano²

2011

Nuclear Magnetic Resonance

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“…Extensive and important bibliographic information is obtained by the annual reports on NMR spectroscopy, e.g. [256].…”

Section: Chemical Methods For Chiral Discrimination Via Nmr Spectroscopymentioning

confidence: 99%

Chiral discrimination in nuclear magnetic resonance spectroscopy

Lazzeretti

2017

J. Phys.: Condens. Matter

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Chirality is a fundamental property of molecules whose spatial symmetry is characterized by the absence of improper rotations, making them not superimposable to their mirror image. Chiral molecules constitute the elementary building blocks of living species and one enantiomer is favoured in general (e.g. L-aminoacids and D-sugars pervade terrestrial homochiral biochemistry) because most chemical reactions producing natural substances are enantioselective. Since the effect of chiral chemicals and drugs on living beings can be markedly different between enantiomers, the quest for practical spectroscopical methods to scrutinize chirality is an issue of great importance and interest. Nuclear magnetic resonance (NMR) is a topmost analytical technique, but spectrometers currently used are 'blind' to chirality, i.e. unable to discriminate the two mirror-image forms of a chiral molecule, because, in the absence of a chiral solvent, the spectral parameters, chemical shifts and spin-spin coupling constants are identical for enantiomers. Therefore, the development of new procedures for routine chiral recognition would offer basic support to scientists. However, in the presence of magnetic fields, a distinction between true and false chirality is mandatory. The former epitomizes natural optical activity, which is rationalized by a time-even pseudoscalar, i.e. the trace of a second-rank tensor, the mixed electric dipole/magnetic dipole polarizability. The Faraday effect, magnetic circular dichroism and magnetic optical activity are instead related to a time-odd axial vector. The present review summarizes recent theoretical and experimental efforts to discriminate enantiomers via NMR spectroscopy, with the focus on the deep connection between chirality and symmetry properties under the combined set of fundamental discrete operations, namely charge conjugation, parity (space inversion) and time (motion) reversal.

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Chapter 4 Analyses of Proton NMR Spectra of Strongly and Weakly Dipolar Coupled Spins: Special Emphasis on Spectral Simplification, Chiral Discrimination, and Discerning of Degenerate Transitions

Cited by 17 publications

References 167 publications

Nuclear Magnetic Resonance: Basic Principles and Liquid State Spectroscopy

Nuclear Magnetic Resonance: Basic Principles and Liquid State Spectroscopy

NMR of liquid crystals and micellar solutions

Chiral discrimination in nuclear magnetic resonance spectroscopy

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