Table 5. Optimal Isomerization Reaction Conditions for the Studied Systems in the Solid State Based On the IR Spectroscopy Results^a.

compound	λirr (nm)	Tirr (K)	Trev (K)
Ni-2a	470–530	10–140	220
Ni-2b	530	180	220
Cu-2a	590	10	60
Cu-2b	405	10	80

^aSymbols are defined as follows: λ_irr, the most efficient LED central wavelength regarding the generation of the metastable linkage isomer; T_irr, the temperature at which the metastable linkage isomer’s population is the highest; and T_rev, the temperature at which the system reverts back to the ground state.