Solvent extraction of calcium and strontium into nitrobenzene by using a synergistic mixture of hydrogen dicarbollylcobaltate and bis(diphenylphosphino)methane dioxide.

Extraction of microamounts of calcium and strontium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of bis(diphenylphosphino)methane dioxide (DPPMDO, L) has been investigated. The equilibrium data have been explained assuming that the species HL+, HL2+, ML2(2+), ML3(2+) and ML4(2+) (M2+ = Ca2+, Sr2+) are extracted into the organic phase. The values of extraction and stability constants of the cationic complexes in nitrobenzene saturated with water have been determined. In the considered nitrobenzene medium, it was found that the stability constants of the complexes CaL2(2+), CaL3(2+) and CaL4(2+), where L is DPPMDO, are somewhat higher than those of the corresponding complex species SrL2(2+), SrL3(2+) and SrL4(2+) with the same ligand L.

Luminescent properties of europium complexes with bis(diphenylphosphino)alkane dioxides.

Eu(NO(3))(3) · 5H(2)O and EuCl(3) · 6H(2)O were allowed to react with bis(diphenylphosphino)alkane dioxides Ph(2)P(O)(CH(2))(n) P(O)Ph(2)(n = 2, 4, 6) to obtain polymeric and binuclear complexes. The prepared compounds were structurally characterized by X-ray diffraction. Luminescence measurements (emission and excitation spectra, quantum yields, lifetimes) were compared with crystallographic data in order to find a relationship between luminescent properties of the Eu(III) complexes and their structures. The Eu(III) polymers, especially [Eu(dpphO(2))(2)Cl(2)](+) Cl(-)}(n), have shown extremely long luminescence lifetimes, up to 3.73 ms, as a result of a highly protecting hydrophobic shield.

Solvent extraction of calcium and strontium into nitrobenzene by using a synergistic mixture of hydrogen dicarbollylcobaltate and 2,6-(diphenylphosphino)pyridine dioxide.

Solvent extraction of microamounts of calcium and strontium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of 2,6-(diphenylphosphino)pyridine dioxide (DPPPDO, L) has been investigated. The equilibrium data have been explained assuming that the species HL+, HL+2, CaL2+2, CaL2+3, SrL2+2, SrL2+3 and SrL2+4 are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined.

Synergistic extraction of europium into nitrobenzene by using hydrogen dicarbollylcobaltate and 2, 6 - (diphenylphosphino)pyridine dioxide.

Solvent extraction of microamounts of europium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of 2, 6 - (diphenylphosphino)pyridine dioxide (DPPPDO, L) has been investigated. The equilibrium data have been explained assuming that the species HL+, HL+2, EuL3+3 and EuL3+4 are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined.

From parquets to bricks: a series of lanthanide coordination polymers with bis(diphenylphosphino)ethane dioxide.

A series of new layered coordination polymers consisting of Ln[Ph2P(O)-CH2CH2-P(O)Ph2]1.5 monomeric units, where Ln = Pr(NO3)3, Nd(NO3)3, NdCl3, Sm(NO3)3, GdCl3, Dy(NO3)3, were synthesized and structurally characterized. The majority of prepared compounds display approximately rectangular building blocks. However, the adopted architecture strongly depends on additional nonbridging ligands in the coordination sphere of the cation, as well as on the reaction conditions and the employed solvent. Accordingly, the solvothermally prepared polymers exhibit either parquet-floor or brick-wall architecture, whereas the polymers from gel-diffusion reactions resemble honeycomb networks. The solvothermal reaction of the smallest lanthanide cation Lu3+ with Ph2P(O)-CH2CH2-P(O)Ph2 led to a molecular compound instead of a polymer.

The synthesis and crystal structures of two-dimensional coordination polymers of Ph2P(O)-CH2CH2-P(O)Ph2 and Ph2P(O)-C5H3N-P(O)Ph2 with praseodymium.

Reactions of Pr(NO3)3 with Ph2P(O)-CH2CH2-P(O)Ph2 and Ph2P(O)-C5H3N-P(O)Ph2 yielded layered network coordination polymers with bidentate ligands spanning the lanthanide atoms in a bridging fashion. The praseodymium cations with "spacer" ligands form two-dimensional building blocks assembling into either square grid or herringbone network.