was prepared as plate-like crystals from the reaction between [Fe(L17)(MeOH)2] and 10 equivalents of bipy in methanol, while a dinuclear {(μ-bipy)[Fe(L17)(MeOH)]2}•2MeOH was obtained as block-shaped crystals using 0.5 equivalents of bipy (Fig. ). Single crystal X-ray diffraction analysis of 24 at 123 K divulged that each Fe(II) center lies in an octahedral N3O3 surrounding and coordinates with two of the nitrogen and two of the oxygen donor atoms coming from ligand L17, one oxygen atom from a methanol molecule and bridged by a bipy ligand. The average Fe-N, Fe-O bond distances, and the characteristic O-Fe-O angle, suggested the HS state of the Fe(II) metal center at this temperature. Although single-crystal X-ray diffraction analysis was not obtained after many attempts, the polymeric nature and the structural formula of 24 were corroborated by the elemental analysis, mass spectrometry, powder X-ray diffraction, and scanning electron microscopy analysis. Comparison of photoluminescence ratio at 2 = 673 nm and 1 = 550 nm with T value of 24. Adapted with permission from Ref. .