A novel organic ligand, 6-diphenylamine carbonyl 2-pyridine carboxylic acid (HDPAP), and the corresponding lanthanide complexes, tris (6-diphenylamine carbonyl 2-pyridine carboxylato) samarium (III)(Sm-DPAP) and tris (6-diphenylamine carbonyl 2-pyridine carboxylato) dysprosium (III)(Dy-DPAP) have been designed and synthesized. The crystal structures and photoluminescence of Sm-DPAP and Dy-DPAP have been studied. The ...