Syntheses, structures, and magnetic properties of new rare earth coordination polymers constructed by 1,3,5-benzenetriacetic acid

Abstract

Three new coordination polymers with formula [Gd(bta)(H 2 O)·1.39H 2 O] n (1), [Dy(bta)(H 2 O)·1.35H 2 O] n (2) and [Y(bta)(H 2 O) 2 ·0.5H 2 O] n (3) were synthesized by using corresponding rare earth nitrates and 1,3,5-benzenetriacetic acid (H 3 bta) under hydrothermal/solvothermal reaction conditions, and characterized by single-crystal X-ray diffraction. In these complexes, the carboxylate groups of bta 3− adopt different coordination modes, namely one carboxylate group adopts µ 2 -η 1 :η 1 -bridging and each of the other two carboxylate groups adopts µ 2 -η 2 :η 1 -bridging coordination modes in 1 and 2, and one carboxylate group adopts a µ 2 -η 2 :η 1 -bridging coordination mode and each of the other two carboxylate groups adopts a µ 2 -η 1 :η 1 -bridging mode for the major component and one carboxylate group adopts a µ 2 -η 2 :η 1 -bridging coordination mode, one has a µ 2 -η 1 :η 1 -bridging mode and the third has a monodentate mode for the minor component in 3. The magnetic properties of the complexes 1 and 2 were investigated in the temperature range of 1.8-300 K.

Thermal and spectroscopic (IR, XPS) properties of lanthanide(III) benzene-1,3,5-triacetate complexes

“…Scheme 1 Possible coordination modes of bta ligand in the lanthanide(III) complexes [18][19][20][21] of reaction have a great impact on the MOFs structure [20]. The whole series of lanthanide(III) complexes was prepared under exactly the same conditions: in the reaction of lanthanide(III) chlorides (pH 5.3-5.8) and the ammonium salt of H 3 bta (pH & 5.5) in the 0.01 M solutions at 40°C at the molar ratio 1:1.…”

“…Recently, some interest has arisen in the construction of lanthanide MOFs with flexible organic ligands for example: Tb(III) and Ho(III) phenylene-1,2-diacetates [15], Sm(III), Eu(III), Tb(III), Ho(III) phenylene-1,3-diacetates [16], lanthanide phenylene-1,4-diacetates [17] and benzene-1,3,5-triacetates (Scheme 1) [18][19][20][21] owing to their flexibility and conformational freedoms. The use of lanthanide ions in that construction is due to the high coordination number (8 or 9) as well as special properties of the lanthanide ions.…”

The Construction of Open GdIII Metal–Organic Frameworks Based on Methanetriacetic Acid: New Objects with an Old Ligand

“…[17] MOFs with other flexible C 3 -scaffold type tricarboxylic acids have been prepared, in particular with H 3 bta and lanthanide cations, [18] illustrating the potential interest of this strategy.…”

Interplay of thermochemistry and Structural Chemistry, the journal (volume 17, 2006) and the discipline

“…The issue then continues with the study of Zhang et al [11]. This study discusses syntheses, structures, and magnetic properties of new rare earth coordination polymers constructed from 1,3,5-benzenetriacetic acid (H 3 bta), one of several rigid multicarboxylate ligands used in the past decade used in the construction of transition and/or rare earth metals polymeric complexes.…”

“…Two new polyoxometalates [Cd(2,2 0 -bpy) 3 ] 2 [PMo(V)Mo(VI) 11 O 40 ] and [H 3 PMo 12 O 40 ]Á3(4,4 0 -bpy)Á4H 2 O (bpy = bipyridyl) were synthesized and their structures determined. While both compounds have strong photoluminescence properties which make them excellent candidates for potential photoactive materials, the second compound also showed high catalytic activity for the oxidation of benzaldehyde to benzoic acid using H 2 O 2 as an oxidant.…”