The theory of cosy NMR experiments revisited: Application to an AX spin system of quadrupolar nuclei

2010 ◽  
Vol 36A (3) ◽  
pp. 170-177 ◽  
Author(s):  
P. Kempgens
Keyword(s):  
Spin System ◽  
Quadrupolar Nuclei ◽  
Cosy Nmr

Quantum state tomography for quadrupolar nuclei using global rotations of the spin system

2007 ◽  
Vol 126 (15) ◽  
pp. 154506 ◽  
Author(s):  
J. Teles ◽  
E. R. deAzevedo ◽  
R. Auccaise ◽  
R. S. Sarthour ◽  
I. S. Oliveira ◽  
...  
Keyword(s):  
Quantum State ◽  
Spin System ◽  
Quadrupolar Nuclei ◽  
Quantum State Tomography ◽  
State Tomography

Relaxation of Spin 1/2 in the Scalar Coupled Spin System AMX with Quadrupolar Nuclei in the Presence of Cross-correlation Effects

2004 ◽  
Vol 59 (4-5) ◽  
pp. 217-4
Author(s):  
G. S. Kupriyanova
Keyword(s):  
Spin System ◽  
Cross Correlation ◽  
Relaxation Times ◽  
Formal Theory ◽  
Quadrupolar Nuclei ◽  
Transverse Relaxation ◽  
Selective Determination ◽  
Product Operator ◽  
Dynamic Frequency

We present the formal theory of the nuclear magnetic relaxation of spin ½ A in a scalar coupled spin system AMX with quadrupolar nuclei of spin 1 (M, X) considering cross-correlation relaxation based on second order time-dependent perturbation theory and the product operator formalism. The expressions for longitudinal and transverse relaxation times and dynamic frequency shifts of each component of the spectral pattern are derived. Several experimental schemes for the selective determination of the cross-correlation rate between different spin orders are proposed.

A Complete Product Operator Theory for IS (I=1, S = 1) Spin System and Application to 3D HMQC-COSY NMR Experiment

2009 ◽  
Vol 64 (5-6) ◽  
pp. 377-386 ◽  
Author(s):  
İrfan Şaka ◽  
Sedat Gümüş ◽  
Azmi Gençten
Keyword(s):  
Spin System ◽  
Operator Theory ◽  
Quantum Coherence ◽  
Spin Systems ◽  
Multiple Quantum ◽  
Complete Product ◽  
Weakly Coupled ◽  
Product Operator ◽  
Cosy Nmr ◽  
Spectral Assignment

There exist a variety of multi-pulse NMR experiments for spectral assignment of complex molecules in solution. The conventional heteronuclear multiple-quantum coherence (HMQC) NMR experiment provides correlation between weakly coupled hetero-nuclei. The COSY is one of the most popular two-dimensional NMR experiment which is used to correlate J-coupled homo-nuclei of spectral assignment. The combination of the conventional HMQC and COSY NMR experiments yields a new experiment called 3D HMQC-COSY NMR experiment. The product operator theory is widely used for the analytical descriptions of multi-pulse NMR experiments for weakly coupled spin systems in liquids. In this study, complete product operator theory for weakly coupled IS (I = 1, S = 1) spin system is presented by obtaining the evolutions of the product operators under the spin-spin coupling Hamiltonian. As an application and a verification, analytical descriptions of 3D HMQC-COSY NMR experiment are obtained for weakly coupled ISnI’_S’m (I = I’ = 1/2; S = S’ = 1; n = 1,2, 3; m = 1, 2) multi-spin systems. Then the estimated spectra of this experiment for various multi-spin systems are explained in detail.

Two dimensional 29Si-29Si INEPT DQF COSY NMR for the structure of alkoxysilane polymers in solution

1994 ◽  
Vol 91 ◽  
pp. 409-418 ◽  
Author(s):  
P Lux ◽  
F Brunet ◽  
H Desvaux ◽  
J Virlet
Keyword(s):  
Two Dimensional ◽  
Cosy Nmr

1H NMR Conformational Studies in Water of Angiotensin II Analogues Modified at the N- and C-Termini: Interactions of the Aromatic Side Chains and Folding of the N-Terminal Domain

1994 ◽  
Vol 59 (11) ◽  
pp. 2523-2532 ◽  
Author(s):  
John Hondrelis ◽  
John Matsoukas ◽  
George Agelis ◽  
Paul Cordopatis ◽  
Ning Zhou ◽  
...  
Keyword(s):  
Shielding Effect ◽  
Resonance Spectroscopy ◽  
Nmr Studies ◽  
Previous Suggestion ◽  
Aminoisobutyric Acid ◽  
H Nmr ◽  
Neutral Ph ◽  
Angiotensin Ii Analogues ◽  
Proton Resonances ◽  
Cosy Nmr

The conformation of [Sar1]angiotensin II in water at neutral pH has been examined by proton magnetic resonance spectroscopy at 400 MHz and in particular by comparing its 1H NMR spectral data with those of analogues modified at positions 1,4 and 6, namely [Sar1,Cha8]ANGII, [Des Asp1,Cha8]ANGII, [Aib1,Tyr(Me)4]ANGII, [Aib1,Tyr(Me)4,Ile8]ANGII, [N-MeAib1,Tyr(Me)4]ANGII, [N-MeAib1,Tyr(Me)4,Ile8]ANGII, ANGIII and [Sar1,Ile8]ANGII. Assignment of all proton resonances in these analogues was made possible by 2D COSY NMR experiments. The H-2 and H-4 protons for the histidine ring in [Sar1]ANGII, ANGII and ANGIII were shielded compared with the same protons in [Sar1,Ile8]ANGII, [Sar1,Cha8]ANGII and [Des Asp1,Cha8]ANGII; this shielding effect was not disturbed upon methylation of the tyrosine hydroxyl and/or replacement of residue 1 (sarcosine or aspartic acid) with aminoisobutyric acid (Aib) or N-methyl aminoisobutyric acid (N-MeAib). These data are consistent with our previous suggestion based on NMR studies in neutral DMSO that a characteristic folded conformation for ANGII previously observed in non-polar solvents can also be detected in water at neutral pH, but to a lesser degree.

Charge-transfer driven ferromagnetism in a disordered three-dimensional 3d-5d spin system

2021 ◽  
pp. 168330
Author(s):  
Supratik Dasgupta ◽  
Philipp Komissinskiy ◽  
Pavan Nukala ◽  
Iliya Radulov ◽  
Andrei Rogalev ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Spin System ◽  
Three Dimensional
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