Syntheses, Structures, Photoluminescence, and Magnetism of a Series of Discrete Lanthanide Complexes based on 2,5‐Dichlorobenzoate and 1,10‐Phenanthroline

Abstract

The syntheses and crystal structures of eight lanthanide complexes with formula [Ln(2,5-DCB) x (phen) y ] are reported, which are characterized via single-crystal, powder X-ray diffraction, elemental analysis, IR spectroscopy, thermogravimetric analysis, photoluminescence measurement, and DC/AC magnetic measurement. These eight complexes are isostructural, and possess a discrete dinuclear structure. The adjacent dinuclear molecules are linked by the hydrogen bonding interactions into a one-dimensional (1D) supramolecular 580 chain. The neighboring 1D chains are further extended into a twodimensional (2D) supramolecular layer by the π-π stacking interactions. The photoluminescent properties of complexes 1 (Nd III ), 2 (Sm III ), 3 (Eu III ), 5 (Tb III ), 6 (Dy III ), and 8 (Yb III ) were investigated. Magnetic investigations also reveal the presence of ferromagnetic interactions in complexes 4 (Gd III ), 6 (Dy III ), and 7 (Er III ). Additionally, complex 6 (Dy III ) demonstrates field-induced slow magnetic relaxation behavior.

Cube‐like 12‐MC‐4 and Offset Stacked 10‐MC‐3 Metallacrowns: Synthesis, Structure, and Magnetic Properties

“…Both χ M ′ and χ M ′′ data show frequency dependence below 3 K, indicating SMM behavior. Owing to the limit of the instrument, the maximum signals of χ M ′′ were not probed below 1.8 K, thus, the energy barrier ( U eff ) and relaxation time ( τ 0 ) cannot be calculated by the traditional Arrhenius equation . Therefore, the energy U eff (0.3 K) and τ 0 (3.7 × 10 –5 s) were deduced through Debye mode (Figure right).…”

Effect of single variable factor of electron‐acceptor on the luminescence quantum yield of terbium complex

“…Each dinuclear cluster (Figure 2b) contains two Tb 3 + , six fully deprotonated BMBA, and two auxiliary ligands of phen to form an electroneutral unit. [24,25] BMBA shows three coordination modes of 2.12, 2.11, and 1.11 (Figure S1). Selected bond angles and bond lengths for Tb-Br and Tb-I are in line with reported results [26][27][28][29][30] and are listed in Table S1-S2.…”

“…Both compounds emit green (CIE: 0.3149, 0.5789, Figure 3c) and greenish-yellow luminescence (CIE: 0.4089, 0.5344, Figure 3c), with narrow emission bands in 450-650 nm. [25,32] The maximum intensities at 489, 543, 586, and 620 nm are assigned to the 5 D 4 ! 7 F J (J = 3-6) transitions of Tb 3 + (Figure 3a, 3b).…”