Stability of Different BTBP and BTPhen Extracting or Masking Compounds against γ Radiation.

The radiolytic stability of hydrophobic extracting compounds CyMe-BTBP and CyMe-BTPhen and a hydrophilic masking agent (PhSOH)-BTPhen, widely employed for trivalent minor actinoid and lanthanoid separation, against γ radiation was tested. Even though the solvent with a promising fluorinated diluent BK-1 provides better extraction properties compared to octan-1-ol, its radiation stability is much lower, and no extraction was observed already after an absorbed dose of 150 kGy (CyMe-BTBP) or 200 kGy (CyMe-BTPhen). For the (PhSOH)-BTPhen hydrophilic masking agent, the results showed that the rate of radiolytic degradation was significantly higher in 0.

Synergistic extraction of calcium and strontium into nitrobenzene by using hydrogen dicarbollylcobaltate and n,n´-dimethyl-n,n´-diphenyl-2,6-dipicolinamide.

Extraction of microamounts of calcium and strontium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of N,N´-dimethyl-N,N´-diphenyl-2,6-dipicolinamide (MePhDPA, L) has been investigated. The equilibrium data have been explained assuming that the species HL+, HL+2, ML2+2 and ML2+3 (M2+ = Ca2+, Sr2+) are extracted into the organic phase. The values of extraction and stability constants of the cationic complex species in nitrobenzene saturated with water have been determined.

N,N'-Diethyl-N,N'-diphenyl-pyridine-2,6-dicarboxamide.

The asymmetric unit of the title compound, C(23)H(23)N(3)O(2), contains two mol-ecules in both of which, one amide N atom is in a syn position with respect to the pyridine N atom, while the other amide N atom is in an anti position (the syn--anti conformation). There are minor conformational differences between the two mol-ecules, as reflected in the N(pyridine)-C-C-N(amide) torsion angles of -44.9 (3) and 136.

N,N,N',N'-Tetra-isobutyl-pyridine-2,6-dicarboxamide.

In the title compound, C(23)H(39)N(3)O(2), the amide O atoms are displaced by 1.020 (1) and 1.211 (1) Å from the mean plane of the central pyridine ring.

N,N,N',N'-Tetra-ethyl-pyridine-2,6-dicarboxamide.

The title compound, C(15)H(23)N(3)O(2), crystallizes with two mol-ecules in the asymmetric unit which are linked by a C-H⋯N hydrogen bond. In the crystal, mol-ecules are connected via weak C-H⋯O and C-H⋯N hydrogen bonds between the amide O atoms and ethyl chains and between pyridine N atoms and aromatic H atoms in para positions. C-H⋯π inter-actions also occur.