Synthesis, crystal structures, and properties of three metal complexes with N-phenylanthranilic acid

• Synthesis of three new metal complexes with NPA under ancillary ligands.
• Detailed study of crystal structures and their packing.
• Compounds 1 and 2 display strong green photoluminescence emission.
• XRD shows the single phases of 1–3.

The hydrothermal reactions between N-phenylanthranilic acid (NPA), transition metal hydroxide salts and ex-bidentate N-donor ligands in CH3CH2OH/H2O solutions afforded three new complexes, [Cd1.5(NPA)3(2,2′-bipy)] (1), [Zn(NPA)2(2,2′-bipy)] (2,2′-bipy = 2,2′-bipyridine) (2) and [Mn(NPA)2(Phen)2] (Phen = 1,10-phenanthroline) (3). X-ray structural determination indicates that all of the title complexes crystallize in the same triclinic crystal system with space group p1¯. Complex 1 displays a symmetrical trinuclear aggregate, while complexs 2 and 3 display mononuclear structures. All the NPA ligands adopt total different coordination modes in complexes 1, 2 and 3. The comparison of solid-state fluorescence spectra among 1, 2 and free NPA shows that 1 and 2 exist a large red-shifted emission compared to free NPA ligand.

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