“…To date, there have been multiple reports on porphyrin-based self-assembled nanostructures with diverse architectures, namely rods, rings, sheets, wires, and tubes (see Ref. [2] and literature cited therein). An important fact is that in self-assemblies, the porphyrin units are held together and immobilized on the substrate by means of non-covalent interactions (i.e., hydrophobic, van der Waals, hydrogen bonding, -stacking, solvophobic and surface effects); resulting in the formation of the most thermodynamically stable structure, at the same time capable of rearrangements and * Author to whom correspondence should be addressed.…”