Topological ring-currents and bond-currents in the altan-[r,s]-coronenes

π-Electron ring-currents for the altans of the four regular [ r , s ]-coronenes are calculated by the topological HLPM approach. The bond-current pattern of the parent structure is generally preserved in the core of the corresponding altan . Altan -[10,5]-coronene appears to support an anomalous diamagnetic current in its [4 n ]-periphery. This invites further investigation. π-Electron ring-currents for the altans of the four regular [ r , s ]-coronenes are calculated by the topological HLPM approach.