Slow relaxation in doped coordination polymers and dimers based on lanthanoids and anilato ligands

摘要: Abstract In this work we report the synthesis, structure and magnetic properties of two lanthanoid based coordination polymers (CP) dimers prepared with derivatives 2,5-dihydroxy-1,4-benzoquinone (C6O4X2)2− as ligands. Using bromanilato ligand: (C6O4Br2)2− have CP [Eu1.96Dy0.04(C6O4Br2)3(DMSO)6]·2DMSO (1) (DMSO = dimethylsulfoxide) chlorocyananilato (C6O4(CN)Cl)2−) one formulated [Eu1.96Dy0.04(C6O4(CN)Cl)3(DMSO)6] (2) isostructural dimers: [Eu1.96Dy0.04(C6O4(CN)Cl)3(H2O)10]·6H2O (3) [Eu2(C6O4(CN)Cl)3(H2O)10]·6H2O (4). Compounds 1, 2 3 are Eu(III) compounds doped 2.0 % Dy(III), whereas compound 4 is a pure phase Eu(III). The X-ray these CPs shows that 1 present neutral (6,3)-2D networks rectangular cavities in very distorted hexagonal 2, while dimeric where Ln(III) ions connected by bis-bidentate ligand. Each metal completes its nonacoordination environment terminal bidentate ligand five water molecules slightly capped square antiprismatic geometry. addition, complexes interesting properties. behave single-molecule magnets (SMM) energy barriers 40.9 25.3 K, respectively. contrast, does not any SMM behaviour.