Syntheses, Structures and Luminescent Properties of Two Novel M(II)-Phen-SIP Supramolecular Compounds (M = Co, Ni)

Two metal compounds, 1 and 2, have been obtained by incorporating 1,10-phenanthroline (phen) and 5-sulfoisophthalic acid monosodium salt () ligands under hydrothermal conditions. Meanwhile, the two compounds were characterized by element analysis, IR, XRD, TG-DTA and single-crystal X-ray diffraction. Both 1 and 2 present 3D supramolecular structures via O-HO hydrogen bond interactions. Luminescent properties for 1 and 2 were also studied. The compound 1 has two fluorescence emission peaks centered at 398 nm attributed to the intraligand emission from the SIP ligand and at 438 nm assigned to the combined interaction of intraligand transitions of the phen ligand and ligand-to-metal-charge-transfer (LMCT) transitions ( = 233 nm). The compound 2 shows one emission band centered at 423 nm with a shoulder peak at 434 nm which may be originated from the intraligand transitions of the phen ligand ( = 266 nm).