title: Measuring proton shift tensors with ultrafast MAS NMR.
abstract: A new proton anisotropic-isotropic shift correlation experiment is described which operates with ultrafast MAS, resulting in good resolution of isotropic proton shifts in the detection dimension. The new experiment makes use of a recoupling sequence designed using symmetry principles which reintroduces the proton chemical shift anisotropy in the indirect dimension. The experiment has been used to measure the proton shift tensor parameters for the OH hydrogen-bonded protons in tyrosine·HCl and citric acid at Larmor frequencies of up to 850 MHz.
authors.affiliation: School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK.
authors.forename: Habeeba K
authors.initials: HK
authors.lastname: Miah
authors.forename: David A
authors.initials: DA
authors.lastname: Bennett
authors.forename: Dinu
authors.initials: D
authors.lastname: Iuga
authors.forename: Jeremy J
authors.initials: JJ
authors.lastname: Titman
mesh_terms: D016880:Anisotropy; D019343:Citric Acid / Q000737:chemistry; D003198:Computer Simulation; D006860:Hydrogen Bonding; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D011522:Protons; D014443:Tyrosine / Q000737:chemistry
chemical_list: D007202:Indicators and Reagents; D011522:Protons; D019343:Citric Acid; D014443:Tyrosine
keywords: Anisotropic–isotropic shift correlation; Chemical shift anisotropy; Hydrogen bonding; Symmetry-based recoupling sequence; Ultrafast magic angle spinning