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/

Global: Zendy Plus annual

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

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Eight  p -adamantylcalix[4]arene derivatives, bearing four CMPO-like functions [(CH 2 ) n NHC(O)CH 2 - P(O)Ph 2 ] at the wide ( 4a,b ,  n  = 0, 1) or narrow ( 5a–c  and  6a–c ,  n  = 2–4) rims were synthesized for the first time. Studies of the extraction of americium(III) and europium(III) from 3 M HNO 3  solutions to organic phases (dichloromethane,  m -nitro-trifluoromethylbenzene) showed: (i) The extraction ability for all the adamantylcalixarene ligands is much better than for their monomeric analogues – N -(1-adamantyl)-,  N -(1-adamantylmethyl)- and  N , N -(dibutyl)carbamoylmethyldiphenylphosphine oxides  7a, 7b, 8;  (ii) The extraction percentage increases strongly with increasing length of the spacer for all types of ligands  4–6 , and best extraction results were found for  4b  ( n  = 1) and 5c ( n  = 4); (iii) The separation coefficient  D  Am / D  Eu  for the investigated compounds did not exceed 2, which is close to the narrow rim CMPO calixarenes, studied earlier; (iv) Variation of the spacer length between CMPO groups attached to the 1,3- and 2,4-positions of the calixarene platform in  6  did not lead to appreciably improved extractants, neither with respect to the extraction abilities ( D ) nor to the selectivities ( D  Am / D  Eu ).

Extraction of americium and europium by CMPO-substituted adamantylcalixarenes