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We noted in the experimental section that one of the reported crystal structures, {Pr(Nitrone) 2 (NO 3 ) 3 }, may be better described in the noncentrosymmetric space group P1 than in the centrosymmetric space group P1 h; this choice was based on better classical quality criterions in the former. Nevertheless, following discussions with careful readers we acknowledge and from consideration based on atomic displacement parameters we believe that this crystal structure is more likely to be centrosymmetric. However, nothing discussed in the article is modified by such a correction.

Light-Induced Excited Spin-State Trapping has been studied since 1982 in solution and 1984 in solid state as it offers a reversible way of photoswitching the electronic configuration of spin crossover systems. Since then, the lifetime of the photo-induced state was deeply investigated through kinetics measurements. In 1998, a fast and easy way to record the limit temperature above which the photo-induced state is erased, denoted T(LIESST), was introduced. This procedure has been widely used in the spin crossover community due to its easiness and its efficiency to provide detailed information on the photo-induced state. Correlations between T(LIESST) and structural parameters have been proposed for instance. However, it intrinsically contains drawbacks that can lead to misinterpretation of behaviours and can lead to an over-estimation of its scope. This review aims to present and discuss not only the correct way to measure T(LIESST) but also the essential contributions it has brought and the limits not to be exceeded in its interpretation.