English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

The 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 : UO 2 (NO 3 ) 2 (B 4 bL 4 )  n  ·  x H 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 UO 2  2+  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 μs &lt; τ  s  &lt;250 μs and 630 μs &lt; τ  L  &lt; 640 μs, pointing to the presence of two species with differently coordinated calixarene, as substantiated by a XPS study of U(4 f  5/2,7/2 ), O(1 s ) and P(2 p ) levels on solid state samples. The extraction study of UO 2  2+  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.

Uranyl complexes formed with a para-t -butylcalix[4]arene bearing phosphinoyl pendant arms on the lower rim. Solid and solution studies