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

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

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130 Citations (Scopus)
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Abstract

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
Volume1997
Issue number20
DOIs
Publication statusPublished - 1997

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