Binuclear complexes of lanthanides with 1,4-bis(diphenylphosphino)butane dioxide

Selective electrochemical capture and release of uranyl from aqueous alkali, lanthanide, and actinide mixtures using redox-switchable carboranes

We report the selective electrochemical biphasic capture of the uranyl cation (UO₂²⁺) from mixed-metal alkali (Cs⁺), lanthanide (Nd³⁺, Sm³⁺), and actinide (Th⁴⁺, UO₂²⁺) aqueous solutions to an organic, 1,2-dichloroethane (DCE), phase using the ortho-substituted nido-carborane anion, [1,2-(Ph₂PO)₂-1,2-C₂B₁₀H₁₀]²⁻ (^POCb²⁻). The reduced ^POCb²⁻ is generated by electrochemical reduction of the closo-carborane, ^POCb, prior to mixing with the aqueous mixed-metal solution. Subsequent UO₂²⁺ release from the captured product, [UO₂(^POCb)₂]²⁻, was performed by galvanostatic bulk electrolysis of the DCE phase and back-extraction of UO₂²⁺ to a fresh aqueous phase. The selective capture and release of UO₂²⁺ was confirmed by combined ICP-OES and NMR spectral analyses of the aqueous and organic phases, respectively, against the newly synthesized nido-carborane complexes, [[CoCp*₂][Cs(^POCb)]]₂, [CoCp*₂]₃[Nd(^POCb)₃], [CoCp*₂]₃[Sm(^POCb)₃], and [CoCp*₂]₂[Th(^POCb)₃].

Redox-switchable carboranes electrochemically capture and release UO₂²⁺ selectively from mixed metal aqueous solutions, mimicking in part spent nuclear fuel.

A new air- and moisture-stable pentagonal-bipyramidal DyIII single-ion magnet based on the HMPA ligand

A new pentagonal-bipyramidal Dy^III SIM was obtained with HMPA ligand, which is stable to air and moisture and shows slow relaxation of magnetization up to 36 K (1000 Hz) with U_eff of 556 K.

Regulating structural dimensionality and emission colors by organic conjugation between SmIII at a fixed distance

The conjugation of bridging bis(diphenylphosphine oxide) alkane or arene ligands was found to control the structural dimensionality and the emission color of complexes from reactions with SmIII(hfac)3(H2O)2 (hfac- = hexafluoroacetylacetonato) while retaining the SmSm distances. Bis(diphenylphosphine oxide)-1,4-butane (L1) affords a one-dimensional (1D) ribbon {Sm(hfac)3(L1)}∞ (1) that emits red color, while bis(diphenyl-phosphinoyl)-1,4-benzene (L2) results in a two-dimensional (2D) network {Sm(hfac)2(CF3COO)(L2)3}∞ (2) and near-white emission, but bis(diphenyl-phosphinoyl)-9,10-anthracene (L3) forms a zero-dimensional (0D) cyclic structure {Sm(hfac)3(L3)}2 (3) with strong ππ interactions that emit green color. Noticeably, the conjugation change is accompanied by a configurational change of coordination from trans for 1 and 2 to cis for 3. The color change is associated with the superposition of ligand and Sm based electronic band energies and their intensities. Such white light emission by a single compound having contributions from different building components is quite rare.

Lanthanide contraction and chelating effect on a new family of lanthanide complexes with tetrakis(O-isopropyl)methyle-nediphosphonate: synthesis, structures and terahertz time-domain spectroscopy

Sixteen lanthanide–diphosphate complexes have been synthesized by the reaction of lanthanide chlorides and tetrakis(O-isopropyl)methylenediphosphonate ligand in the solvent of acetonitrile (with ethanol or DMF) at room temperature.

Triphenyltin(iv) adducts of diphosphoryl ligands: structural, electronic and energy aspects from X-ray crystallography and theoretical calculations

Triphenyltin(iv) adducts of diphosphoryl ligands, RR′P(O)–X–P(O)RR′, were introduced. The influence of the ligand structures on the crystal packing of the complexes and Sn-O interactions was discussed using geometrical and theoretical analysis.