DIPOLE-MOMENTS OF THE CARBONYL GROUPS IN CYCLIC BETA-DIKETONES FROM IR SPECTROSCOPY DATA

The alpha(Co) angles between the carbonyl groups and the dipole moments of a number of 2-arylindan-1,3-diones were determined from the data of IR spectroscopy. The effects of substituents on alpha(Co) depending on their positions and inductive factors were found. It was established that the interaction between the vibrations of the carbonyl groups depends on both the alpha(Co) angle or the Sigma mu(Co) dipole moment and the coplanar arrangement of these groups.