Intramolecular electric field effects in some complexes of acetylacetone

Abstract

The ¹³C–¹H spin–spin coupling constants and i.r. stretching frequencies of the ring C H and CH₃ groups of 29 acetylacetonato-complexes are shown to vary linearly with each other and with the chemical shift of the proton. The results can be quantitatively interpreted in terms of the electric field model previously suggested by two of us and equations are given relating the changes in the coupling constants to the stretching frequencies and to the electric fields produced within the complexes.