Fig. 5
From: Emergence of the structure-directing role of f-orbital overlap-driven covalency

Electrostatic potential (ESP) surface of the [C]=Th2+ fragment. As a function of distance this shows the approach of the model BIPM [C] ligand to the Th [r(Th-C[C])] at a 6.491 Å, b 5.491 Å, c 4.491 Å, d 3.491 Å, e 2.491 Å, the value in the optimised structure of [C]=Th=NCH3. The isovalue is 0.5