000179975 001__ 179975
000179975 005__ 20190316235425.0
000179975 0247_ $$2doi$$a10.1524/ract.2012.1925
000179975 022__ $$a0033-8230
000179975 02470 $$2ISI$$a000305599500002
000179975 037__ $$aARTICLE
000179975 245__ $$aUranyl complexes formed with a para-t-butylcalix[4]arene bearing phosphinoyl pendant arms on the lower rim. Solid and solution studies
000179975 260__ $$c2012
000179975 269__ $$a2012
000179975 336__ $$aJournal Articles
000179975 520__ $$aThe current interest in functionalized calixarenes with phosphorylated pendant arms resides in their coordination ability towards f elements and capability towards actinide/rare earth separation. Uranyl cation forms 1: 1 and 1: 2 (M : L) complexes with a tetra-phosphinoylated p-tert-butylcalix[4]arene, B(4)bL(4): UO2(NO3)(2)(B(4)bL(4))(n)center dot xH(2)O (n = 1, x = 2, 1; n = 2, x = 6, 2). Spectroscopic data point to the inner coordination sphere of 1 containing one monodentate nitrate anion, one water molecule and the four phosphinoylated arms bound to UO22+ while in 2, uranyl is only coordinated to calixarene ligands. In both cases the U(VI) ion is 8-coordinate. Uranyl complexes display enhanced metal-centred luminescence due to energy transfer from the calixarene ligands; the luminescence decays are bi-exponential with associated lifetimes in the ranges 220 mu s < tau(s) <250 mu s and 630 mu s < tau(L) < 640 mu s, pointing to the presence of two species with differently coordinated calixarene, as substantiated by a XPS study of U(4f(5/2, 7/2)), O(1s) and P(2p) levels on solid state samples. The extraction study of UO22+ cation and trivalent rare-earth (Y, La, Eu) ions from acidic nitrate media by B(4)bL(4) in chloroform shows the uranyl cation being much more extracted than rare earths.
000179975 6531_ $$aActinides
000179975 6531_ $$aLanthanides
000179975 6531_ $$aCalixarene
000179975 6531_ $$aUranyl luminescence
000179975 6531_ $$aXps
000179975 6531_ $$aExtraction
000179975 6531_ $$aSeparation
000179975 6531_ $$aDensity functional theory
000179975 6531_ $$aLanthanide Complexes
000179975 6531_ $$aPhosphorylated Calixarenes
000179975 6531_ $$aElectronic-Structure
000179975 6531_ $$aSolvent-Extraction
000179975 6531_ $$aSynergistic Agent
000179975 6531_ $$aAqueous-Solution
000179975 6531_ $$aCrown-Ethers
000179975 6531_ $$aXps Spectra
000179975 6531_ $$aF-Elements
000179975 6531_ $$aMetal-Ions
000179975 700__ $$uInst Nacl Invest Nucl, Dept Quim, Ocoyoacac 52750, Mexico$$aRamirez, F. de M.
000179975 700__ $$uBulgarian Acad Sci, Ctr Phytochem, Inst Organ Chem, BU-1113 Sofia, Bulgaria$$aVarbanov, S.
000179975 700__ $$0241990$$g122803$$uEcole Polytech Fed Lausanne, Inst Chem Sci & Engn, CH-1015 Lausanne, Switzerland$$aBuenzli, J.-C. G.
000179975 700__ $$uInst Fis BUAP, Puebla 72570, Mexico$$aRivas-Silva, J. F.
000179975 700__ $$uInst Fis BUAP, Puebla 72570, Mexico$$aOcana-Bribiesca, M. A.
000179975 700__ $$uInst Mexicano Petr, Programa Ingn Mol, Mexico City 7730, DF, Mexico$$aCortes-Jacome, M. A.
000179975 700__ $$aToledo-Antonio, J. A.$$uInst Mexicano Petr, Programa Ingn Mol, Mexico City 7730, DF, Mexico
000179975 773__ $$j100$$tRadiochimica Acta$$q359-369
000179975 8564_ $$uhttps://infoscience.epfl.ch/record/179975/files/RCA-12-Flor.pdf$$zn/a$$s613822$$yn/a
000179975 909C0 $$xU10099$$0252081$$pLCSL
000179975 909CO $$ooai:infoscience.tind.io:179975$$qGLOBAL_SET$$pSB$$particle
000179975 917Z8 $$x122803
000179975 917Z8 $$x122803
000179975 937__ $$aEPFL-ARTICLE-179975
000179975 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000179975 980__ $$aARTICLE