Magnetic and Luminescent Properties of Sm, Eu, Tb, and Dy Coordination Polymers with 2‐Hydroxynicotinic Acid

Abstract

By using multidentate ligand 2‐hydroxynicotinic acid (H2nica), six new lanthanide coordination polymers [Sm(Hnica)(H2O)2SO4]n (1), {[Sm3(Hnica)6(H2O)6(OH)]·3H2O·SO4}n (2), [Eu(Hnica)(H2O)2SO4]n (3), {[Eu3(Hnica)6(H2O)6(OH)]·6H2O·SO4}n (4), {[Tb(Hnica)2(H2O)2]ClO4·H2O}n (5), and {[Dy(Hnica)2(H2O)2]ClO4·H2O}n (6) were synthesized and characterized by elemental analysis, IR spectra, and X‐ray single‐crystal diffraction. Compounds 1 and 3 exhibit a 1D Ln–O–Ln chain structure. Compounds 2 and 4 show a 2D Kagomé lattice structure, whereas 5 and 6 display a 2D rhombic grid structure. The luminescent properties of 1–6 at room temperature were studied. Direct‐current (dc) magnetic susceptibility studies reveal antiferromagnetic interactions between LnIII ions in 1–6, and alternating‐current (ac) magnetic susceptibility data of 6 suggests frequency‐dependent out‐of‐phase signals below 5 K.

Thermal Stability and Luminescent Properties of Tri-cellulose Acetate Composites Containing Dy(SSA)3Phen Complex

“…Emission spectra of TCA/Dy(SSA) 3 Phen (0/100, 96/4, 93/7, 90/10, and 87/13) composites were obtained by exciting at 326 nm, 312 nm, 312 nm, 309 nm, and 309 nm, respectively, as shown in Figure 6. For the pure Dy (SSA) 3 Phen complex, the strong emission band with a maximum at 436 nm is assigned to π ⟶ π * electron transition of the SSA ligands and the weak band at around 573 nm is ascribed to the 4 F 9/2 ⟶ 6 H 13/2 transition of Dy 3+ ions [2,35,36]. is is probably because the introduction of the central Dy 3+ ions is propitious to the energy transfers of the SSA ligands, due to the larger planar structure of the Dy (SSA) 3 Phen complex (Figure 4) [36].…”

“…Polymer/rare earth (RE) composites possess excellent optical, electrical, and spectroscopic properties stemming from the additive rare-earth compounds and meantime have fine processability and flexibility arising from polymer materials, which can be potentially applied in light-emitting diodes, detector systems, X-ray phosphors, solid-state lasers and bioinorganic sensors, etc. [1][2][3][4][5]. Considerable attention has been paid to design and synthesize polymer/RE luminescent materials with good luminescent properties and high internal quantum efficiencies [6][7][8].…”

Microwave-assisted synthesis of lanthanide 2,6-naphthalenedicarboxylates: Thermal, luminescent and sorption characterization

“…Rapid development in chemistry of lanthanide-organic frameworks has been observed in the past decade [1][2][3][4][5][6][7][8]. These frameworks consist of metal ions or clusters linked to each other through bridging organic ligands.…”

“…Intensity of emission of the lanthanide centers in MOFs can be efficiently enhancement by using organic ligand which acts as ''antenna'' in the energy transfer process to the appropriate metal energy level. Although a number of lanthanide-based MOFs have been documented [1][2][3][4][5][6][7][8][9][10][11][12][22][23][24][25][26][27][28][29][30][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54], the luminescence investigations focus mainly on their fundamental properties whereas lifetimes of excited states of Ln(III) ions are less documented [36,42,44,46,50,54].…”

Ferro-/antiferromagnetic interactions in two one-dimensional Cu(II) complexes: Syntheses, crystal structures and magnetic studies

“…The judicious selection of organic ligand to provide pathways for exchange coupling between spin centers is important to synthesize molecule-based magnetic materials. 2-Hydroxynicotinic acid [18-32] and 6-hydroxynicotinic acid [33][34][35][36][37][38][39][40] have been used as ligands to synthesize kinds of complexes, and recent works on lanthanide coordination polymers with 2-hydroxynicotinic acid [41,42] show intriguing structures and interesting magnetic properties by our group. Our interest in hydroxynicotinic acid stems from the desire to employ both carboxylic and hydroxyl functional groups as magnetic exchange mediators in polymeric structures.…”