“…Concomitant with color changes, their physical and chemical properties, such as molecular geometry, dipole moment and electronic structure, alter with isomerization and show switchable on and off states [5][6][7]. The interest in photo-switchable molecules is large and covers diverse research fields ranging from nanomachines (rotaxane-based molecular machines [8][9][10], light-driven rotary molecular motors [11,12]), photoactive nanoparticles (noble metal Nps [13][14][15], fluorescent Nps [16,17]), nanoelectronics [7] (photoactive molecular junctions [18][19][20][21][22], rectifiers [23], memories [24,25] or organic field effect transistors [25,26]), metal organic nanoassemblies (photoswitchable metal-organic molecular cage [27] or metal-organic frameworks [28,29]) supramolecular self-assembled systems (light driven supramolecular amphiphiles [30], supramolecular polymers [31,32]), biological nanosystems [5,33] and pharmacology [34]. Among all the photochromic molecule family, Diarylethene (DAE) [7,35,36], is the most popular on account of its outstanding properties such as: (i) the photochemical switch between the open and closed forms is highly efficient and robust; (ii) both isomers show high thermal stability and fatigue resistance; (iii) upon isomerization, DAE derivatives show significant electronic variations, leading to a HOMO or LUMO frontier orbitals shift, that the closed form has a reduced energy gap…”