Magnetic and structural properties of two open-frameworks Nd(III) adipates

Flexible Ligand‐Based Lanthanide Three‐Dimensional Metal–Organic Frameworks with Tunable Solid‐State Photoluminescence and OH‐Solvent‐Sensing Properties

“…We observe that χ M T decreases on reducing the temperature, a fact that can be related to the antiferromagnetic ordering of the Nd 3+ ions. The linearity of χ M –1 indicates that the susceptibility follows the Curie–Weiss law, C /( T – θ ), with C = 2.02 emu K mol –1 and θ = –57(1) K. Similar temperature dependence was observed for flexible 3D Nd‐adipates, previously synthesized by us , . The negative value of θ also indicates an antiferromagnetic interaction.…”

“…The linearity of χ M -1 indicates that the susceptibility follows the Curie-Weiss law, C/(T -θ), with C = 2.02 emu K mol -1 and θ = -57(1) K. Similar temperature dependence was observed for flexible 3D Nd-adipates, previously synthesized by us. [32,33] The negative value of θ also indicates an antiferromagnetic interaction. For Gd-msucc [Figure 8 (bottom)], the χ M also follows the Curie-Weiss law, with C = 6.43 emu K mol -1 and θ = -2 K. χ M T departs from a value of 6.5 emu K mol -1 at 300 K, which is slightly smaller than that corresponding to the isolated Gd 3+ ions with an 8 S 7/2 ground state, [31] and it remains almost constant on lowering the temperature.…”

Polymeric chains, hydrogen bonds and magnetism in Nd(III) adipates

“…As described in Ref. [5], Nd(III) ions in 3 are nine, coordinated by two O atoms of water molecules and seven from Adip. Two alternating bridges help the Nd to build infinite polymeric chains, which are linked by a three-dimensional HB network comprising hydration waters and some of the Adip O atoms.…”

“…[1]) is primarily due to the wide variety of structures that can be built taking advantage of the versatility of these ligands, of formula: -O 2 C(CH 2 ) n CO 2 -, which allow to obtain materials with unique properties, especially in magnetism, luminescence and catalysis. Many recent reports have focused on the synthesis and characterization of transition metal and rare earth compounds using dicarboxylates of different length as blocking and bridging ligands [2][3][4][5][6]. These anions work as multifunctional ligands, not only due to their various coordination modes (several chelating bidentate and/or different bridging, which can coexist) but also because of their ability to act as hydrogen bond acceptors and donors to generate supramolecular assemblies of varied dimensions.…”

“…Regarding magnetic characteristics, the carboxylate bridge has evidenced to be an efficient pathway to couple paramagnetic or magnetic centers either ferro-or antiferromagnetically [7][8][9][10], the coupling constant being influenced by the conformation of the bridge or the geometry of the magnetic center environment. We have recently synthesized from solutions, under ambient conditions, and solved [5]. Their AC susceptibility showed a rather complex temperature (T) dependence, which seemed to be correlated with the degree of hydration.…”