chemical shift anisotropy
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2021 ◽  
pp. 107091
Author(s):  
Annemarie Kehl ◽  
Markus Hiller ◽  
Fabian Hecker ◽  
Igor Tkach ◽  
Sebastian Dechert ◽  
...  

2021 ◽  
Vol 34 (02) ◽  
pp. 776-789
Author(s):  
Nastaran Saghayimarouf ◽  
Majid Monajjemi ◽  
Karim Zare ◽  
Ali Shamel

Carbon nano tubes (CNTS) have two basic structure as single-walled and multi-walled based on hexagonal plexus of carbon atoms. CNTs can serve as platforms to conjugate other compounds specially in medications purposes by immobilization of biomolecules at their surface. Dopamine and serotonin are two biological molecules which have bifunctional activities as hormone and neurotransmitter. These two molecules have important roles as neurotransmitters in the central and peripheral nervous systems but serotonin functions as a mood regulator, while dopamine is connected to the “pleasure center”. In this article we optimized molecular and structural properties of connected dopamine and serotonin with SWNTS with four different diameters (7.0,7.5,7.7 and 10.0 nm) by using molecular quantum methods such as NMR shielding tensor data by B3LYP level of theory with 6-31 G(d) as a basis set, mk and frequency methods. Theoretical computations were performed to study NMR chemical shift data including magnetic shielding tensor (σ, ppm), shielding asymmetry (η), magnetic shielding anisotropy (σaniso), magnetic shielding isotropy (σiso) , skew of a tensor (Κ) and chemical shift anisotropy (Δσ) and span (Ω) at various rotation angles around a specific rotation  , physical and chemical properties of atomic nuclei , frequency data  by B3LYP/6-31g level of theory and POP method using gaussian 09 program.


2021 ◽  
Author(s):  
Amrit Venkatesh ◽  
Frédéric Perras ◽  
Aaron Rossini

<p>Constant-time (CT) dipolar heteronuclear multiple quantum coherence (D-HMQC) has previously been demonstrated as a method for proton detection of high-resolution wideline NMR spectra of spin-1/2 nuclei with large chemical shift anisotropy (CSA). However, <sup>1</sup>H transverse relaxation and <i>t</i><sub>1</sub>-noise often reduce the sensitivity of D-HMQC experiments, preventing the theoretical gains in sensitivity provided by <sup>1</sup>H detection from being realized. Here we demonstrate a series of improved pulse sequences for <sup>1</sup>H detection of spin-1/2 nuclei under fast MAS, with <sup>195</sup>Pt SSNMR experiments on cisplatin as an example. First, a new <i>t</i><sub>1</sub>-incrementation protocol for D-HMQC dubbed Arbitrary Indirect Dwell (AID) is demonstrated. AID allows the use of arbitrary, rotor asynchronous <i>t</i><sub>1</sub>-increments, but removes the constant time period from CT D-HMQC, resulting in improved sensitivity by reducing transverse relaxation losses. Next, we show that short high-power adiabatic pulses (SHAPs), which efficiently invert broad MAS sideband manifolds, can be effectively incorporated into <sup>1</sup>H detected symmetry-based resonance echo double resonance (S-REDOR) and <i>t</i><sub>1</sub>-noise eliminated D-HMQC experiments. The S-REDOR experiments with SHAPs provide approximately double the dipolar dephasing, as compared to experiments with rectangular inversion pulses. We lastly show that sensitivity and resolution can be further enhanced with the use of swept excitation pulses as well as adiabatic magic angle turning.</p>


2021 ◽  
Author(s):  
Amrit Venkatesh ◽  
Frédéric Perras ◽  
Aaron Rossini

<p>Constant-time (CT) dipolar heteronuclear multiple quantum coherence (D-HMQC) has previously been demonstrated as a method for proton detection of high-resolution wideline NMR spectra of spin-1/2 nuclei with large chemical shift anisotropy (CSA). However, <sup>1</sup>H transverse relaxation and <i>t</i><sub>1</sub>-noise often reduce the sensitivity of D-HMQC experiments, preventing the theoretical gains in sensitivity provided by <sup>1</sup>H detection from being realized. Here we demonstrate a series of improved pulse sequences for <sup>1</sup>H detection of spin-1/2 nuclei under fast MAS, with <sup>195</sup>Pt SSNMR experiments on cisplatin as an example. First, a new <i>t</i><sub>1</sub>-incrementation protocol for D-HMQC dubbed Arbitrary Indirect Dwell (AID) is demonstrated. AID allows the use of arbitrary, rotor asynchronous <i>t</i><sub>1</sub>-increments, but removes the constant time period from CT D-HMQC, resulting in improved sensitivity by reducing transverse relaxation losses. Next, we show that short high-power adiabatic pulses (SHAPs), which efficiently invert broad MAS sideband manifolds, can be effectively incorporated into <sup>1</sup>H detected symmetry-based resonance echo double resonance (S-REDOR) and <i>t</i><sub>1</sub>-noise eliminated D-HMQC experiments. The S-REDOR experiments with SHAPs provide approximately double the dipolar dephasing, as compared to experiments with rectangular inversion pulses. We lastly show that sensitivity and resolution can be further enhanced with the use of swept excitation pulses as well as adiabatic magic angle turning.</p>


2021 ◽  
Author(s):  
Mary Roberts ◽  
Jingfei Cai ◽  
V.N. Sivanandam ◽  
Hanif M. Khan ◽  
Nathalie Reuter ◽  
...  

High resolution field cycling <sup>31</sup>P NMR spin-lattice relaxometry, where the sample is excited at high field, shuttled in the magnet bore for low field relaxation, then shuttled back to high field for readout of the residual magnetization, provides data on phospholipid dynamics and structure. In the field range from 11.74 down to 0.003 T three dipolar nuclear magnetic relaxation dispersions (NMRDs) and one due to <sup>31</sup>P chemical shift anisotropy contribute to R<sub>1 </sub>of phospholipids<sub>.</sub> Extraction of correlation times and maximum relaxation amplitudes for these NMRDs provides (1) lateral diffusion constants for different phospholipids in the same bilayer (illustrated with phospholipase C binding), (2) estimates of how additives alter the motion of the phospholipid about its long axis (looking at cholesterol effects), and (3) an average <sup>31</sup>P – <sup>1</sup>H angle with respect to the bilayer normal, which reveals that polar head group motion is not restricted on a µs timescale. Although this deals exclusively with phospholipids in small unilamellar vesicles, these same NMRDs can be measured for phospholipids in micelles and nanodiscs, making this technique useful for monitoring lipid behavior in a variety of structures.


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