Metal–organic coordination polymers based on a flexible tetrahydrofuran-2,3,4,5-tetracarboxylate ligand: syntheses, crystal structures, and magnetic/photoluminescent properties

Tetrahydrofurantetracarboxylic Acid: An Isomerizable Framework-Forming Ligand in Homo- and Heterometallic Complexes with UO22+, Ag+, and Pb2+

“…An appealing ligand with a somewhat flexible conformation and four possible degrees of deprotonation, tetrahydrofurantetracarboxylic acid (H 4 thftc) has not been widely used until now, and virtually all the crystal structures reported for its salts or complexes contain alkali, alkaline-earth, , or d-block metal cations. − In the f-element series, the complexation of lanthanide ions by H 4 thftc was investigated in solution, , and the complexes formed were shown to be stronger than those with uranyl ion; the weak complexation of the latter cation compared with that of the transuranic elements was put to use in a solvent extraction process for nuclear waste reprocessing . However, no crystal structure of a lanthanide or transuranic cation complex with H 4 thftc has ever been reported, and, apart from the complexes of the cations cited above, the only crystallographically characterized species are three uranyl ion complexes. , …”

A Lanthanide Ion-Decorated Uranyl−Organic Two-Dimensional Assembly with all-cis 1,2,3,4,5,6-Cyclohexanehexacarboxylic Acid

“…Alkali- or alkaline earth-decorated metal−organic frameworks have been investigated for their potential as H 2 -storage materials . Numerous compounds which can be seen as decorated inorganic or metal−organic frameworks can also be found in d block metal chemistry . Concerning uranium-containing polymers, some examples have been described, such as [UF 8 ] ∞ chains decorated with pendent [UO 2 F 5 ] 3− groups, uranyl phosphate or phosphonate one- or two-dimensional polymers with [Ag(2,2′-bipy)] + or [Cu(H 2 O) x ] 2+ ( x = 2, 3) units, respectively, or a uranyl−organic two-dimensional assembly, also with [Ag(2,2′-bipy)] + groups .…”

Four Transition Metal Coordination Polymers based on an Aromatic Multi‐carboxylic Acid as Ligand: Syntheses, Crystal Structures, and Fluorescent/Magnetic Properties

“…The χ m T product decreases steadily with the decrease in temperature, and tends to become zero at low temperature for complex 2 due to the Boltzmann depopulation of excited states and population of the ground state, indicating an overall antiferromagnetic behavior. A small increase is observed below 50 K, due to the presence of small amount of paramagnetic impurity 24. Taking into consideration the superexchange interaction ( J ) between two Cu II ions pathway through oxygen atoms bridges, inter dimer weak interactions ( θ ), and neglected zero‐field effects of the triplet state, the susceptibility data of complex 2 can be well simulated by using the Bleaney‐Bowers expression25 for the exchange‐coupling in a two spin S = 1/2 system: χ m = (Ng 2 μ B 2 / k ( T – θ ) [3 + exp (–2 J / kT )] –1 , where N , g , μ B , and K have their usual meanings.…”