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Solvent effects on halothane: 19F nuclear magnetic resonance in solvents and artificial membranes.

This study of solvent effects on halothane 19 F nuclear magnetic resonance chemical shifts was undertaken in order to elucidate environmental factors contributing to observed halothane 19 F NMR shifts in the presence of phospholipid suspensions in aqueous media. Halothane 19 F NMR chemical shifts are correlated by Hildebrand’s δ function or refractive index for non-hydrogen-bonding solvents. No significant correlation was observed for other solvent properties, such as dielectric constant. Water and alcohols show positive deviations from the correlation with δ. Halothane molecules associated with both synthetic and natural phospholipid multilayer vesicles show significant line broadening of the fluorine signal and appear to be in an environment which may be characterized by a δ value of 9.3 ± 0.3 (cal/cm 3 ) 1/2 by comparison with the observed correlation of chemical shift with δ in isotropic solvent systems.