CMP(O) tripodands: synthesis, potentiometric studies and extractions


Reinoso-Garcia, Marta M. and Janczewski, Dominik and Reinhoudt, David N. and Verboom, Willem and Malinowska, Elzbieta and Pietrzak, Mariusz and Hill, Clement and Baca, Jiri and Gruner, Bohumir and Selucky, Pavel and Gruttner, Cordula (2006) CMP(O) tripodands: synthesis, potentiometric studies and extractions. New Journal of Chemistry, 30 (10). pp. 1480-1492. ISSN 1144-0546

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Abstract:Ligand systems containing three carbamoylmethylphosphonate (CMP) or -phosphine oxide (CMPO) moieties attached to a tripodal platform have been synthesized for metal complexation and subsequent extraction from HNO3 solutions. The incorporation into ion selective electrodes (ISE) and picrate extractions with Na+, K+, Ag+, Ca2+, Cd2+, Hg2+, Pb2+, Cu2+, Eu3+ and Fe3+ shows that CMPO tripodand 3 is very selective for Eu3+ and forms a very stable complex (logML = 28.3). Liquid–liquid extractions performed with Eu3+ and Am3+ show reasonable extraction properties of the CMP(O) tripodands 3, 11 and 13 in 1,1,2,2-tetrachloroethane, while in 1-octanol for all tripodands studied the distribution coefficients are low. Upon addition of the synergistic agent hexabrominated cobalt bis(dicarbollide) anion (bromo-COSAN) the distribution coefficients for Am3+ and Eu3+ extraction increase considerably for CMP(O) tripodands 3 and 4. Covalently linked COSAN only enhances the extraction of Am3+ and Eu3+ at 0.001–0.01 M HNO3. The functionalization of dendrimer coated magnetic silica particles with CMP(O) tripodands led to very effective particles ( 31 and 32) for Am3+ and Eu3+ removal from 0.01 M HNO3 solutions.
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Copyright:© 2006 Royal Society of Chemistry
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