LIESST iron(II) spin-crossover mononuclear complex [Fe(L)(CN)2]·H2O (1) (L is Schiff-base macrocyclic ligand derived from the condensation of 2,6-diacetylpyridine with 3,6-dioxaoctane-1,8- diamine) with macro ring and two CN−bridging ligands was used as optically switchable molecular building blocks. Since the bidentate CN−ligands in complex1can coordinate to other metal compounds, it is possible to build one-dimensional molecular-based photo-magnets. We have synthesized [Fe(L)(CN)2][Mn(hfac)2] (2) and investigated it by using magnetic susceptibility, Mössbauer spectra and IR spectra mesurements. The complex2exhibits spin-crossover behavior (T1/2=110 K) on the moieties of the iron sites.