Synthesis of some β-diketone complexes of lanthanides and study of their shift reagent effects

Abstract

series of complexes of <i>ortho, meta </i> and <i>para </i> substituted dibenzoylmethane(DBM) with lanthanides(Ln) have been synthesized and the induced shifts in ¹H NMR spectra on <i>n</i>-pentanol have been studied. The studies of the shift behaviour of trivalent lanthanide complexes of dibenzoylmethane on <i>n</i>-pentanol shows that the <i>meta </i> substitution of halogens has more shift effect compared to <i>ortho </i> and <i>para </i> substitution. It has been observed that the induced shift of the protons of <i>n</i>-pentanol decreases along the series CCl₄ > CDCl₃ > C₆D₆ > > (CD₃)₂CO.