Liquid-liquid extractions using poly(propylene imine) dendrimers with an apolar periphery

M.W.P.L. Baars, P. Froehling, E.W. Meijer

Research output: Contribution to journalArticleAcademicpeer-review

133 Citations (Scopus)
132 Downloads (Pure)


The prepn. and ESR spectroscopy of a series of fully functionalized poly(propylenimine) dendrimers (DAB-dendr-(NH2)n; n = 2, 4, 8, 16, 32, 64) with 3-carboxy-PROXYL radical end groups is described. The pendant nitroxyl end groups exhibit a strong exchange interaction. As a consequence, the ESR spectrum directly reveals the no. of end groups from the splitting between the hyperfine transitions for the lower generations. For the higher generations an increasingly exchanged-narrowed ESR spectrum is obsd. The temp. and solvent dependency of the exchange interaction is used to assess the dynamic behavior of the dendritic branches. FT-IR spectroscopy shows that a hydrogen-bonded network between the amide functionalities is present, consistent with the obsd. solvent effect on the ESR spectra
Original languageEnglish
Pages (from-to)1959-1960
JournalChemical Communications
Issue number20
Publication statusPublished - 1997


Dive into the research topics of 'Liquid-liquid extractions using poly(propylene imine) dendrimers with an apolar periphery'. Together they form a unique fingerprint.

Cite this