A new class of Dy^III-SIMs associated with a guanidine-based ligand

Abstract

A family of four mononuclear DyIII complexes of guanidine-based ligand L [L = tris(2-hydroxybenzylidene)triaminoguanidine] with formulas [DyLCl2(DMF)2]·DMF·CH3OH (1), [DyL2(CH3OH)2]Br·H2O·3CH3OH (2), [DyL2(H2O)2]SCN·3H2O·CH3OH) (3) and [DyL2(CH3OH)2]SCN·CH3CN·CH3OH (4) were successfully prepared by fluctuating...

A family of mono-, di-, and tetranuclear DyIIIcomplexes bearing the ligand 2,6-diacetylpyridine bis(picolinoylhydrazone) and exhibiting slow relaxation of magnetization

“…, the B k q term), responsible for the mitigation of QTM, to vanish and ideally quench the fast relaxation of the magnetization. 55 A search in the Cambridge Structural Database (CSD) revealed the absence of mononuclear Dy III complexes bearing a N 3 O 3 Cl 2 set of donor atoms. The closest environment to that of 1 can be resembled by the 8-coordinate compounds [DyCl(bpy) 2 (H 2 O) 3 ]Cl 2 (DyN 4 O 3 Cl chromophore) and [DyCl(terpy)(H 2 O) 4 ]Cl 2 (DyN 3 O 4 Cl chromophore), 56 in which no magnetic data were reported (bpy and terpy are the ligands 2,2′-bipyridine and 2,2′:6′,2′′-terpyridine, respectively), while no results were derived from the search of the DyN 4 O 2 Cl 2 and DyN 2 O 4 Cl 2 chromophores.…”

Controlled Modification of Triaminoguanidine-Based μ3 Ligands in Multinuclear [VIVO]/[VVO2] Complexes and Their Catalytic Potential in the Synthesis of 2-Amino-3-cyano-4H-pyrans/4H-chromenes

“…Compounds incorporating guanidine moieties are an interesting class of compounds with vital biotic actions and extensive utilization in the pharmaceutical industry. − The triaminoguanidine-based μ 3 -molecules have been employed as excellent construction blocks in designing and building π-stacked organic luminescent supramolecular assemblies, ionic covalent organic nanosheets, honeycomb-type porous 2D molecular networks, and porous 3D coordination polymers . Some of these ligands show important luminescent properties and have been used as selective sensors for Cu­(II), Co­(II), and S 2– ions via colorimetric and turn-off fluorometric fashion. , Metal complexes of such triaminoguanidine-based μ 3 -ligands [for example (a) of Chart ] have also been used in designing metallo-supramolecular cage compounds, − and some of them showed good magnetic property …”

Strong magnetic exchange coupling in Ln2 metallocenes attained by the trans-coordination of a tetrazinyl radical ligand

“…1,2 In recent years, mononuclear late lanthanide molecules (e.g., Tb III , Dy III , Er III ) with high anisotropy have been prominent examples of high-performing SMMs. [3][4][5][6][7][8] Namely, cyclopentadienyl-based molecular systems such as [Cp*DyCp iPr5 ] + (Cp* = pentamethylcyclopentadienyl; Cp iPr5 = pentaisopropylcyclopentadienyl) have shown that blocking of the magnetization above the temperature of liquid nitrogen can be achieved through careful molecular design. 9 However, mononuclear SMMs are limited by the number of unpaired electrons and single-ion anisotropy as they only contain a single Ln III ion.…”