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

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, [Cd-1.5(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 p (1) over bar. 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. (C) 2015 Elsevier B.V. All rights reserved.