Modified z-gradient filtering as a mean to obtain phased deuterium autocorrelation 2D NMR spectra in oriented solvents

Olivier Lafon (1) , Denis Merlet (1) , Jacques Courtieu (1) , Philippe Lesot (1, 2)

1 ICMMO - Institut de Chimie Moléculaire et des Matériaux d'Orsay
2 CNRS - Centre National de la Recherche Scientifique

We describe a modified z-gradient filter scheme specifically designed to obtain pure absorption mode deuterium 2D NMR spectra recorded in oriented solvents. The proposed technique is investigated by analysing the evolution of the density operator for a spin I = 1. The method is applied to the recently designed Q-COSY and Q-resolved 2D experiments to simplify the analysis of chiral molecules dissolved in weakly orienting chiral liquid crystals. The efficiency of this z-gradient filtering technique is illustrated using the perdeuterated 1-butanol, a prochiral molecule of average Cs symmetry, dissolved in an organic solution of poly-γ-benzyl-l-glutamate (PBLG). The experimental results as well as the advantages of the new experiments compared with the previous ones are described and discussed.

Mots clés: PBLG; z-Gradient filter; Chiral liquid crystals; Quadrupolar splittings; NMR; Deuterium

Domaines: Chimie analytique; Chimie théorique et/ou physique

Olivier Lafon, Denis Merlet, Jacques Courtieu, Philippe Lesot. Modified z-gradient filtering as a mean to obtain phased deuterium autocorrelation 2D NMR spectra in oriented solvents. Journal of Magnetic Resonance, 2004, 171 (1), pp.135-142. ⟨10.1016/j.jmr.2004.08.010⟩. ⟨hal-02310847⟩