Calix[6]arenePicolinamide Extractants for Radioactive Waste Treatment: Effect of Additional Carboxy Binding Sites in the Pyridine 6Positions on Complexation, Extraction Efficiency and AnLn Separation Eur. J. Org. Chem. 142010

The cover picture showsthe complexation of actinide metal ions by picolinamidebased calix[6]arenes. These ligands possess remarkable efficiency in the extraction of trivalent metal ions even at very high HNO3concentration and fair selectivity for actinide ions over lanthanide ions, which is useful in the recycling of the spent nuclear fuel. The Partitioning and Transmutation P&T strategy would allow the longlived minor actinides Np, Am, Cm in fast nuclear reactors to be separated and transmutated and would also allow the radiotoxicity in the ultimate waste to be minimized, making nuclear power plants more efficient and sustainable. Details are discussed in the article by M. Mariani, A. Casnati et al. on p. 2675 ff.