Novel Lanthanide(III) Ternary Complexes with Naphthoyltrifluoroacetone: A Synthetic and Spectroscopic Study

Highly Sensitive Luminescent Probe for Singlet Oxygen Based on A Europium (III) Complexes Containing Benzoyltrifluoroacetone and (1-(Anthracen-9-yl)-N-(pyridine-2-yl methyl) Methaneamine Ligands

“…In contrast, the absence of the broad bands in the region 3000 ÷ 3500 cm -1 for M2 suggests that water molecules in M1 have been displaced by the nitrogen donors of AnPy ligand. The absorption at 1600 cm -1 , which is typical for C=O stretch in the HTFPB ligand is bathochromically shifted to 1610 cm -1 in M2 [6].…”

“…The mixture was stirred at room temperature to afford a white solid. The product was washed by a large amount of CCl 4 and air-dried [6]. Yield: 88%.…”

Magnetic and Luminescence Properties of 8-Coordinate Holmium(III) Complexes Containing 4,4,4-Trifluoro-1-Phenyl- and 1-(Naphthalen-2-yl)-1,3-Butanedionates

“…The lanthanide cations (Ln 3+ ) as hard Lewis acids exhibit a strong binding affinity for O -donor ligands such as β-diketone compounds (HL) [ 43 , 44 , 45 , 46 , 47 , 48 , 49 ]. Typically electrically neutral tris complexes, Ln(L) 3 are most likely to be formed [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ], but in some cases, the anionic tetrakis complexes, (Cat + )[Ln(L) 4 ] − are also formed [ 49 , 56 , 57 , 58 , 59 ]. The two categories of these compounds exhibit good luminescent properties [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ].…”

“…Typically electrically neutral tris complexes, Ln(L) 3 are most likely to be formed [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 ], but in some cases, the anionic tetrakis complexes, (Cat + )[Ln(L) 4 ] − are also formed [ 49 , 56 , 57 , 58 , 59 ]. The two categories of these compounds exhibit good luminescent properties [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ]. The luminescence efficiency of the β-diketonato complexes can be enhanced by the appropriate choice of the substituents on the β-diketone ligand because, in this way, the ligands’ triplet levels can be tuned to provide efficient energy transfer between the diketonato ligand and the lanthanide ion [ 60 , 61 , 62 , 63 ].…”

“…This has been observed when aromatic and fluorinated alkyl groups are incorporated into the β-diketone skeletons. This helps in reducing the nonradiative quenching of lanthanide luminescence [ 40 , 41 , 42 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 ]. In the anionic (Cat + )[Ln(L) 4 ] complexes, additional tuning of the photophysical properties is possible by changing the counterion, Cat + , which in turn changes the structure of the complex and, in particular, the local coordination geometry of the metal ion [ 56 , 57 , 58 , 59 ].…”