Photo-induced isomerization in ruthenium nitrosyl complexes Ru-NO / Ru-ON commutation
Obtaining materials with an atom or molecule that can be switched into two distinct states can generate storage capacities comparable to those of the DNA molecule, i.e. of the order of a terabyte/cm3. The choice of photochromic systems was made in favor of ruthenium complexes with a nitrosyl ligand for which two metastable states (MS1, MS2) resulting from the presence of the ruthenium-nitrosyl bond can be observed. Structural studies have shown different conformations of the Ru-NO unit depending on the state concerned.
[RuIINO] hν→ [RuII(ON)]
Among complexes prepared in the group, [Ru(NO)Cl(py)4](PF6)2.1/2H2O exhibit remarkable quasi-complete commutation properties at the solid state (coll. M. Buron-Lecointe).
Figure 1 : trans (NO,Cl)-[Ru(py)4(Cl)NO](PF6)2.1/2H2O : molecular commutation GS/MS1 on single crystals.