β-Diketone: Mg2+ ground and excited state interaction

The solvatochromic properties of saturated β-diketones (dk) are largely dependent on the nature of 1- and 3-aryl substituents. The photophysical properties of four such different diketones (dk 1–4) are studied in a small variety of solvents. For all these diketones intramolecular charge transfer (ICT) take place along with the intermolecular one depending upon the 1,3-diaryl substituents. Formation of isosbestic among the diketones and Mg2+ are well established in the ground state while for excited state these are much labile. The binding energies also vary with the aryl substitution.