Precision1H–1H distance measurement via13C NMR signals: utilization of1H–1H double-quantum dipolar interactions recoupled under magic angle spinning conditions

2004 ◽  
Vol 42 (2) ◽  
pp. 291-300 ◽  
Author(s):  
Yoh Matsuki ◽  
Hideo Akutsu ◽  
Toshimichi Fujiwara
Keyword(s):  
Magic Angle Spinning ◽  
Distance Measurement ◽  
Double Quantum ◽  
Magic Angle ◽  
Dipolar Interactions ◽  
Angle Spinning ◽  
Nmr Signals

scholarly journals Photo-CIDNP 13C Magic Angle Spinning NMR on Bacterial Reaction Centres: Exploring the Electronic Structure of the Special Pair and Its Surroundings

2001 ◽  
Vol 382 (8) ◽  
pp. 1271-1276 ◽  
Author(s):  
Jörg Matysik ◽  
Els Schulten ◽  
Alia Alia ◽  
Peter Gast ◽  
Jan Raap ◽  
...  
Keyword(s):  
Imidazole Ring ◽  
Magic Angle Spinning ◽  
Continuous Illumination ◽  
Magic Angle ◽  
Aromatic Rings ◽  
Special Pair ◽  
Reaction Centres ◽  
Angle Spinning ◽  
Nmr Signals ◽  
Electronic Ground

Abstract Photochemically induced dynamic nuclear polarisation (photoCIDNP) in intact bacterial reaction centres has been observed by 13Csolid state NMR under continuous illumination with white light. Strong intensity enhancement of 13C NMR signals of the aromatic rings allows probing the electronic ground state of the two BChl cofactors of the special pair at the molecular scale with atomic selectivity. Differences between the two BChl cofactors are discussed. Several aliphatic 13C atoms of cofactors, as well as 13C atoms of the imidazole ring of histidine residue(s), show nuclearspin polarisation to the same extent as the aromatic nuclei of the cofactors. Mechanisms and applications of polarisation transfer are discussed.

Interfaces Involving Biomolecules and Inorganic Materials: a Solid State NMR Approach

2007 ◽  
Vol 1008 ◽  
Author(s):  
Christian Bonhomme ◽  
Geoffrey Hartmeyer ◽  
Florence Babonneau ◽  
Michel Wong Chi Man ◽  
Guilhem Arrachart ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Chemical Nature ◽  
Sol Gel ◽  
Magic Angle Spinning ◽  
Inorganic Materials ◽  
Double Quantum ◽  
Magic Angle ◽  
Angle Spinning ◽  
Very High

AbstractMaterials based on ureidopyrimidinone (UPY) dimers and Adenine (A) / Thymine (T) derivatives were synthesized and characterized by advanced solid state NMR (Nuclear Magnetic Resonance) techniques. Silylated UPY molecules were used as model compounds, leading to structured organic-inorganic materials after hydrolysis and condensation processes (sol-gel reactions). High resolution 1H solid state NMR has been extensively used for the in-depth description of the H-bond networks, including very fast MAS (Magic Angle Spinning) experiments at very high field and DQ (double quantum) recoupling experiments. The chemical nature of the organic-inorganic interface has been illuminated by such techniques. In, particular, it has been demonstrated that H-bond networks were preserved during sol-gel reactions and were comparable to those observed in the UPY crystalline precursors.

scholarly journals Heteronuclear and homonuclear radio-frequency-driven recoupling

2021 ◽  
Vol 2 (1) ◽  
pp. 343-353
Author(s):  
Evgeny Nimerovsky ◽  
Kai Xue ◽  
Kumar Tekwani Movellan ◽  
Loren B. Andreas
Keyword(s):  
Radio Frequency ◽  
Numerical Simulations ◽  
Crucial Role ◽  
Pulse Sequence ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Dipolar Interactions ◽  
Phase Cycling ◽  
Angle Spinning

Abstract. The radio-frequency-driven recoupling (RFDR) pulse sequence is used in magic-angle spinning (MAS) NMR to recouple homonuclear dipolar interactions. Here we show simultaneous recoupling of both the heteronuclear and homonuclear dipolar interactions by applying RFDR pulses on two channels. We demonstrate the method, called HETeronuclear RFDR (HET-RFDR), on microcrystalline SH3 samples at 10 and 55.555 kHz MAS. Numerical simulations of both HET-RFDR and standard RFDR sequences allow for better understanding of the influence of offsets and paths of magnetization transfers for both HET-RFDR and RFDR experiments, as well as the crucial role of XY phase cycling.

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