Natural Abundance Nitrogen-15 NMR in Thermotropic Liquid Crystals With Cyano-Group
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Lukas Jackalin
Abstract
We present natural abundance nitrogen-15 (NAN15) NMR spectroscopy in thermotropic liquid crystals. It is demonstrated that high resolution NAN15 NMR spectra in mesophases can be accurately recorded in non-spinning samples with a high orientational molecular order and strong anisotropic spin interactions. In this technique, due to low demand on radio-frequency decoupling power, standard solution-state probes can be used, which generally provide superior sensitivity and spectroscopic resolution in comparison to solid-state probes. We show that 15N chemical shift anisotropy (CSA) can be used as a sensitive probe of molecular orientational dynamics in liquid crystals. This method is exploited here to measure the orientational molecular order parameter of the nematic 4-pentyl-4′-cyanobiphenyl (5CB). Since the nitrogen spectra are obtained from the molecules constituting the mesophase rather than from probe molecules, the information is direct and the analysis and interpretation is straightforward. Nitrogen CSA of immobilized molecules, required in the analysis, is obtained using a DFT calculation. The approach provided consistent results for the order parameter in the nematic 5CB in the whole temperature range, in good agreement with literature data.
Dedicated to: Kev Salikhov on the occasion of his 80th birthday.
Acknowledgments
L. J. acknowledges KTH fund for summer studentship. We thank Björn Dahlgren (KTH) and Tore Brinck (KTH) for support with DFT analysis.
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Articles in the same Issue
- Frontmatter
- Preface
- Basic and Combination Cross-Features in X- and Q-band HYSCORE of the 15N Labeled Bacteriochlorophyll a Cation Radical
- An EPR Study of Small Magnetic Nanoparticles
- Magnetic Resonance Study of the Spin-1/2 Quantum Magnet BaAg2Cu[VO4]2
- Triarylmethyl Radicals: An EPR Study of 13C Hyperfine Coupling Constants
- Natural Abundance Nitrogen-15 NMR in Thermotropic Liquid Crystals With Cyano-Group
- Surface Hydroxyl OH Defects of η-Al2O3 and χ-Al2O3 by Solid State NMR, XRD, and DFT Calculations
- THz ESR study of Spinel Compound GeCo2O4
- Self-Association of Glycyrrhizic Acid. NMR Study
- A Site-Specific Study of the Magnetic Field-Dependent Proton Spin Relaxation of an Iridium N-Heterocyclic Carbene Complex
- Multifrequency Multiresonance EPR Investigation of Halogen-bonded Complexes Involving Neutral Nitroxide Radicals
- Electron Paramagnetic Resonance and DFT Analysis of the Effects of Bulky Perfluoroalkyl Substituents on a Vanadyl Perfluoro Phthalocyanine
- Coordination of the Mn4+-Center in Layered Li[Co0.98Mn0.02]O2 Cathode Materials for Lithium-Ion Batteries
- Triarylmethyl Radical: EPR Signal to Noise at Frequencies between 250 MHz and 1.5 GHz and Dependence of Relaxation on Radical and Salt Concentration and on Frequency
Articles in the same Issue
- Frontmatter
- Preface
- Basic and Combination Cross-Features in X- and Q-band HYSCORE of the 15N Labeled Bacteriochlorophyll a Cation Radical
- An EPR Study of Small Magnetic Nanoparticles
- Magnetic Resonance Study of the Spin-1/2 Quantum Magnet BaAg2Cu[VO4]2
- Triarylmethyl Radicals: An EPR Study of 13C Hyperfine Coupling Constants
- Natural Abundance Nitrogen-15 NMR in Thermotropic Liquid Crystals With Cyano-Group
- Surface Hydroxyl OH Defects of η-Al2O3 and χ-Al2O3 by Solid State NMR, XRD, and DFT Calculations
- THz ESR study of Spinel Compound GeCo2O4
- Self-Association of Glycyrrhizic Acid. NMR Study
- A Site-Specific Study of the Magnetic Field-Dependent Proton Spin Relaxation of an Iridium N-Heterocyclic Carbene Complex
- Multifrequency Multiresonance EPR Investigation of Halogen-bonded Complexes Involving Neutral Nitroxide Radicals
- Electron Paramagnetic Resonance and DFT Analysis of the Effects of Bulky Perfluoroalkyl Substituents on a Vanadyl Perfluoro Phthalocyanine
- Coordination of the Mn4+-Center in Layered Li[Co0.98Mn0.02]O2 Cathode Materials for Lithium-Ion Batteries
- Triarylmethyl Radical: EPR Signal to Noise at Frequencies between 250 MHz and 1.5 GHz and Dependence of Relaxation on Radical and Salt Concentration and on Frequency
