title: Separated local field spectroscopy of columnar and nematic liquid crystals.
abstract: We are in this work comparing the efficiencies of various 1H-13C separated local field (SLF) experiments when applied to columnar and nematic liquid crystals. In particular, the performances of the conventional SLF, proton-detected local field (PDLF), and polarization inversion spin exchange at the magic angle (PISEMA) methods in terms of spectral resolution, robustness, and ability to measure long-range couplings are investigated. The PDLF sequence provides in most cases the best dipolar resolution. This is especially obvious for weakly coupled 1H-13C spin pairs.
authors.affiliation: Division of Physical Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden. sergey@physc.su.se
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Dvinskikh
authors.forename: Herbert
authors.initials: H
authors.lastname: Zimmermann
authors.forename: Arnold
authors.initials: A
authors.lastname: Maliniak
authors.forename: Dick
authors.initials: D
authors.lastname: Sandström
mesh_terms: D000880:Anthraquinones / Q000737:chemistry; D016477:Artifacts; D001713:Biphenyl Compounds / Q000737:chemistry; D002247:Carbon Isotopes; D002911:Chrysenes / Q000737:chemistry; D003461:Crystallography / Q000379:methods*; D008280:Magnetics; D008968:Molecular Conformation; D009038:Motion; D009570:Nitriles / Q000737:chemistry; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D011522:Protons; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D012996:Solutions / Q000737:chemistry*
chemical_list: D000880:Anthraquinones; D001713:Biphenyl Compounds; D002247:Carbon Isotopes; D002911:Chrysenes; D009570:Nitriles; D011522:Protons; D012996:Solutions; C009590:triphenylene; C433919:4-cyano-4'-pentylbiphenyl; C103273:rufigallol