Two dodecanuclear heterometallic [Zn₆Ln₆] clusters constructed by a multidentate salicylamide salen-like ligand: synthesis, structure, luminescence and magnetic properties

Abstract

The employment of a multidentate salicylamide salen-like ligand, 2-hydroxy-N-(2-(2-hydroxybenzylidene)amino)ethyl)benzamide (H3L), in aid of NO3(-) anions under weak basic conditions in Zn(II)-Ln(III) chemistry (Ln = Eu, and Dy, ) led to the isolation of two novel butterfly heterometallic dodecanuclear clusters with six Ln(III) ions occupying the body position and six Zn(II) ions the outer wing-tip sites. All of them are fully characterized by elemental analysis, FT-IR spectroscopy, TG analysis, single-crystal X-ray diffraction, and X-ray powder diffraction (XRPD) techniques. Luminescence studies indicate that exhibits dual emission, while exhibits a bright blue emission under visible light excitation. Furthermore, magnetic susceptibility studies carried out for indicate that the magnetic exchange between Dy(III) ions revealed ferromagnetic interactions with interesting slow relaxation of magnetization of the SMM behavior.

Crystal structure of tetrakis(methanol-κO)-bis{μ2-3-((4-methoxy-2-oxidobenzylidene)amino)-2-oxo-2H-chromen-4-olate-κ4 O,N;O′:O′}dizinc(II), C38H38Zn2N2O14

“…And they can form all kinds of stable metal complexes [8,9], which have interesting structures and wide use in biochemistry [10,11]. Furthermore, they may have magnetic properties [12,13], photophysical properties [14,15], and used in the fields of molecular recognition [16,17], and supramolecular architectures [18]. The X-ray structural study reveals that the title complex is dinuclear (cf.…”

Tri- and Mono-Nuclear Zinc(II) Complexes Based on Half- and Mono-Salamo Chelating Ligands

“…When the added amount of Zn 2+ reached 1.0 equiv., the fluorescence emission intensity became stable, which indicates a 1:1 stoichiometry between Zn 2+ and H2L 1 . The enhancement of fluorescence is due to the coordination of metal ions with ligands [67]. Likewise, Complex 2 displays enhanced emission intensities compared to the corresponding ligand (HL 2 ) when excited at 380 nm.…”

Crystal structure of dimethanol-bis{3-(((2-oxidonaphthalen-1-yl)methylene)amino)-2-oxo-2H-chromen-4-olato-κ3 O,N:O′}dizinc(II), C42H30Zn2N2O10

“…These Schiff base ligands and their metal complexes could be utilized in obtaining luminescence materials [8][9][10][11], biological systems [12], magnetic materials [13][14][15], and supramolecular constructing [16,17]. The binuclear Zn(II) complex of the title structure consists of two Zn(II) atoms, two tridentate ligand units L 2− , two coordinated methanol molecules.…”