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

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

doi:10.1039/a705126c

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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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 language	English
Pages (from-to)	1959-1960
Journal	Chemical Communications, ChemComm
Volume	1997
Issue number	20
DOIs	https://doi.org/10.1039/a705126c
Publication status	Published - 1997

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title = "Liquid-liquid extractions using poly(propylene imine) dendrimers with an apolar periphery",

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",

author = "M.W.P.L. Baars and P. Froehling and E.W. Meijer",

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T1 - Liquid-liquid extractions using poly(propylene imine) dendrimers with an apolar periphery

AU - Baars, M.W.P.L.

AU - Froehling, P.

AU - Meijer, E.W.

PY - 1997

Y1 - 1997

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AB - 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

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DO - 10.1039/a705126c

M3 - Article

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EP - 1960

JO - Chemical Communications, ChemComm

JF - Chemical Communications, ChemComm

IS - 20

ER -

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

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