“…This paper concerns the coordination and photophysical characterizations of Ln(III) complexes with diethyl(phthalimidomethyl)phosphonate, DPIP, ligand in acetonitrile solution, in various coordination environments, and in the solid state, continuing our recent studies on lanthanide complexes with organophosphorus ligands [15,16]. The aim of our present study was to explain the role of various counter ions (NO À 3 , Cl À and ClO spectroscopic studies were prepared by dissolving the prepared 6-hydrated salts in acetonitrile (Aldrich 99,93%).…”