Polymeric chains, hydrogen bonds and magnetism in 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.…”

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

“…The change of v′ -1 slope observed at T C = 280(2) K, along with the maximum found at that temperature in v′T indicates a magnetic transition. The existence of a transition is consistent with the DSC data [24,25]. A linear fit of v′ -1 above T C , assuming a paramagnetic-like behavior, yields Weiss temperatures of 254(2), 155(2) and 130(2) K for compounds 1-3, respectively, thus indicating the existence of short order ferromagnetic exchange interactions.…”

“…The anions lying along a present the form L1, and are coordinated to four Nd atoms, while those lying on c adopt the L2′ form (gauche/anti/anti) and are coordinated to four Nd(III) cations. X-ray powder diffraction analysis and DTA and TG studies of 1 [24,25] have shown (in accordance with Kiritsis et al [11] study of a La derivative) that this compound can be dehydrated, in a reversible way, to get compound 3. The comparison of the porous structures found in 1 and 2 shows that compound 2 does not display two different sets of channels, as found in compound 1.…”

“…Some experiments are already underway. It is worthwhile to mention that AC magnetic susceptibility data obtained from partially rehydrated samples of 3 have shown a correlation between the increase of water content and the amplification of the susceptibility value [24]. This can be assigned to different causes, such as changes in CF parameters, modifications of inter-chain interactions and hydrogen bonding, as found by Price et al [29] in some Mn(III) complexes, or contribution of vibronic interactions induced by waters as those observed by Dalosto et al [30] in copper-doped bis(D,Lhistidino)pentahydrate (C 12 H 26 N 6 O 9 Zn).…”

Mössbauer spectroscopy of 151 europium dicarboxylates

“…A number of rare earth ion complexes with dianion carboxylic acids [1][2][3][4][5] have been reported over several decades; they continue to be of interest because these metal coordination polymers provides a link between synthetic chemistry and materials science. The study is fascinating and intriguing because the actual complex formed depends on such factors as lanthanide ion, the pH, the dicarboxylic ion, and other modes of preparation like the temperature of the solution.…”