Image (IMAGE) Science China Press Caption (a) Schematic presentation of the 'Orbital Electrostatic Energy (OEE)'. The binding energies (BE) of the BF4--π complexes plotted versus (b) the extrema of the electrostatic potential surface above the center of the arene ring with molecular electron density being rendered at the 0.001 a.u. (ESPext) and (c) the orbital electrostatic energy (OEE). Credit ©Science China Press Usage Restrictions Use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.