International audienceIn this paper we put on solid ground the optical time-resolved study of spin-state photoinduced switching in an Fe(III) compound whose structural dynamics have been recently unveiled. We provide the experimental evidence of complex dynamics, occurring in succession, and spanning ten decades in time. We show that in addition to the ultrafast photoinduced molecular switching occurring on the subpicosecond timescale, there exists two additional switching processes significantly affecting the fate of the macroscopic material: one driven by elastic interactions as volume expansion occurs on a tens of nanoseconds timescale, and another one associated with heat diffusion and thermal switching taking place on a tens of microseconds timescale
International audienceVarious systems contg. the [ML5NO] mol., where M = Fe, Ru, ... and L = F, Cl, ..., exhibit switching under continuous light (CW) irradn. between the ground-state nitrosyl (GS), isonitrosyl (MSI), and side-on (MSII) configurations. The metastable populations, however, are often limited to a few percent. The [Ru(py)4Cl(NO)](PF6)2·1/2H2O system is thus a remarkable model compd. as the GS to MSI transformation is nearly complete in a single crystal. A predominant two-step photon absorption process during GS to MSI switching under blue light is revealed by visible absorption spectroscopy, although a low concn. of the transient species hinders the detn. of this process by the structural signature. During the depopulation of MSI, both two-step and direct processes are evidenced under red CW irradn. Different intermediate visible spectra revealing transient species during GS to MSI and the reverse photochem. processes are discussed in relation to MSII properties
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