Two Isostructural Layered Lanthanide(III) Complexes: Syntheses, Structures, Magnetic and Luminescent Properties

Abstract

Two N'‐(2‐hydroxybenzylidene)pyridine N‐oxide‐carbohydrazide (H3L)‐based coordination complexes with the formula [Ln2(DMF)2(OAc)2(HL)2]n (Ln = Dy for 1 and Eu for 2) were solvothermally synthesized. Crystal structures, thermal stabilities, magnetic and luminescent properties of the two complexes were fully investigated. Both complexes are isomorphic two‐dimensional layers with centrosymmetric {Ln2} subunits extended by doubly deprotonated HL2– connectors. Complex 1 with highly anisotropic DyIII spin exhibits slightly frequency‐dependent magnetic relaxations under zero dc field with an effective energy barrier of ca. 6.84 K. EuIII‐based complex 2 displays only one weak fluorescent emission around 532 nm with the absence of characteristic emission of EuIII ion. These results provide helpful hints of the hydrazide Schiff‐functionalized organic ligands on the function modulations of the resulting Ln complexes.

Slow Relaxation of the Magnetization in Anilato-Based Dy(III) 2D Lattices

“…Although most of the SMMs and SIMs are discrete metallic complexes with different nuclearities, in recent years, some one-dimensional [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ], a few two-dimensional [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ] and very few three-dimensional polymers [ 13 , 34 , 35 , 36 ] with SMM behaviour have also been prepared.…”

“…Most of these coordination polymers are formed by Mn(II)/Mn(III) clusters of different nuclearities with SMM behaviour, linked by long bridging ligands that isolate them from the magnetic point of view [ 9 , 10 , 11 , 12 , 13 , 22 , 23 , 24 , 25 , 29 ]. There are also a few coordination polymers containing 3d/4f clusters [ 14 , 15 , 17 , 26 , 27 , 28 ] or lanthanoid ions [ 20 , 35 ], including one- [ 16 , 18 , 19 , 21 ], two- [ 30 , 31 , 32 , 33 , 34 ] and three-dimensional [ 34 , 35 , 36 ] Dy(III) coordination polymers.…”

Synthesis, structures, photoluminescence and magnetic properties of three dinuclear lanthanide(III) complexes derived from 4‐fluorophenylselenoacetic acid

“…[13][14] During the past few decades, some lanthanide coordination complexes based on aromatic carboxylic acid ligands have been extensively researched due to the strong absorption coefficient of the aromatic ring and the strong affinity of the oxygen in the carboxyl group. [15][16][17] Meanwhile, the 1,10-phenanthroline was added as an additional ligand to preclude the coordination of solvent molecules and reduce the non-radiation deactivation, thereby improving the luminescence performance and stability of constructed complexes. [18][19][20][21] Therefore, using 4-fluorophenylselenoacetic acid as the main ligand, 1,10-phenanthroline as the auxiliary ligand, three isostructural lanthanide complexes [Ln 2 L 6 (phen) 2 ] (Ln=Eu (1), Tb (2), Dy (3), L=4-fluorophenylselenoacetate) have been synthesized and characterized.…”

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

“…Lanthanide materials are widely used due to their line-like emission arising from the intra configurational 4f-4f transitions and long luminescence lifetime (up to milliseconds). [1] However, trivalent lanthanide ions have low absorption coefficients in the UV-vis range, because the absorption is Laporte forbidden and leading to weak emission. Thus, the introduction of "antenna" ligand is an efficient way to solve this problem.…”