Visualization of the isosurfaces and profiles of the current density is another useful tool to assess the presence/absence of the ring current, irrespective of their diamagnetic or paramagnetic nature. If the isosurface values are selected properly, they can even roughly show the responsible atomic/molecular orbitals involving in the ring current. An isosurface value of 0.0005 au is a safe choice to reveal an strong aromatic/antiaromatic ring currents. In 3" this isosurface value (even 0.0003 au, Figure ) does not verify the presence of any global current around the Th3 moiety, Up to this point, all tasks can be done using AIMAll suite of programs, which has been used by Liddle and co-workers to analyze bonding in 3". The most reliable measure of the magnetic aromaticity is the integrated current intensity, passing through a plane perpendicular to the ring plane and cutting through a bond. Often one can integrate current intensity passing through an interatomic surface (IAS) of QTAIM but sometimes this is not possible due to the absence of an IAS, or complex molecular topology. In the case of 3" the complex topology of the molecule makes a reliable computation of the current density passing through the IAS impossible; see Methods for details and a simple approach to bypass this issue. Therefore, we performed this task using ReSpect software at the scalar and fully relativistic levels, Table . Table . The ring current and the contribution of the HOMO in the ring current in nA.T -1 units in 3". Negative current values correspond to the paramagnetic current that is associated with magnetic antiaromaticity. (1c) and (4c) refer to scalar and fully relativistic levels of theory. The contribution of the individual molecular orbital in the current density of 3" was measured by placing a rectangular plane ±10 Å above and below the Th3 ring and from the center to 20Å away from the center cutting through a Th-Th bond at scalar relativistic (1c) and fully relativistic (4c) levels, Table . Alternatively, another rectangle with the same length but 2 Å width (±1.0 Å above and below the ring plane) was used to measure the total σ-current density for all MOs passing in between Th-Th bond. This rectangle was selected narrower than the previous one to make sure that the local current density of the potassium ions does not interfere with the ring current measurements. The total current density and the HOMO's current density correspond to those of a weakly antiaromatic molecule. The difference between scalar and fully relativistic currents is about -0.44 nA.T -1 (12.5% of the total scalar current) at PBE level and 0.54 nA.T -1