Structure of dendrimer-dye host-guest complexes as revealed by small-angle X-ray scattering

R. Kleppinger, M.W.P.L. Baars, M.H.J. Koch, E.W. Meijer

Research output: Contribution to journalMeeting AbstractAcademic

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Abstract

Small angle X-ray scattering (SAXS) expts. were performed on dil. aq. solns. of a new type of water-sol. ethyleneoxy-terminated poly(propyleneimine) dendrimer system. They reveal that the dimensions and d. distributions of the dendrimer are hardly affected by a change in the degree of protonation. This is in contrast to recent predictions regarding the structure of polyelectrolyte dendrimers but in line with the results of recent structural studies on charged PAMAM dendrimers. These dendrimer systems were applied as nanosized containers for guests like xanthene dyes. Structural studies with SAXS provide clear evidence for a complex formation but despite higher molar mass the max. dimensions of the complex are only slightly changed compared to the dendritic host. Since the radius of gyration represents the second moment of the electron d. distribution it appears to be very sensitive to changes in this distribution upon encapsulation of heavy-atom contg. guest mols. These are reflected in a decrease of the radius of gyration upon an increase of the guest-host ratio in the soln., a behavior that strongly indicates an accumulation of guest mols. in the center of the dendritic host. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)1014-1015
JournalPolymeric Materials: Science and Engineering
Volume84
Publication statusPublished - 2001

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Dendrimers
X ray scattering
Coloring Agents
Xanthenes
Molar mass
Protonation
Polymethyl Methacrylate
Polyelectrolytes
Encapsulation
Containers
Atoms
Electrons
Water

Cite this

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title = "Structure of dendrimer-dye host-guest complexes as revealed by small-angle X-ray scattering",
abstract = "Small angle X-ray scattering (SAXS) expts. were performed on dil. aq. solns. of a new type of water-sol. ethyleneoxy-terminated poly(propyleneimine) dendrimer system. They reveal that the dimensions and d. distributions of the dendrimer are hardly affected by a change in the degree of protonation. This is in contrast to recent predictions regarding the structure of polyelectrolyte dendrimers but in line with the results of recent structural studies on charged PAMAM dendrimers. These dendrimer systems were applied as nanosized containers for guests like xanthene dyes. Structural studies with SAXS provide clear evidence for a complex formation but despite higher molar mass the max. dimensions of the complex are only slightly changed compared to the dendritic host. Since the radius of gyration represents the second moment of the electron d. distribution it appears to be very sensitive to changes in this distribution upon encapsulation of heavy-atom contg. guest mols. These are reflected in a decrease of the radius of gyration upon an increase of the guest-host ratio in the soln., a behavior that strongly indicates an accumulation of guest mols. in the center of the dendritic host. [on SciFinder (R)]",
author = "R. Kleppinger and M.W.P.L. Baars and M.H.J. Koch and E.W. Meijer",
year = "2001",
language = "English",
volume = "84",
pages = "1014--1015",
journal = "Polymeric Materials: Science and Engineering",
issn = "0743-0515",

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Structure of dendrimer-dye host-guest complexes as revealed by small-angle X-ray scattering. / Kleppinger, R.; Baars, M.W.P.L.; Koch, M.H.J.; Meijer, E.W.

In: Polymeric Materials: Science and Engineering, Vol. 84, 2001, p. 1014-1015.

Research output: Contribution to journalMeeting AbstractAcademic

TY - JOUR

T1 - Structure of dendrimer-dye host-guest complexes as revealed by small-angle X-ray scattering

AU - Kleppinger, R.

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

AU - Koch, M.H.J.

AU - Meijer, E.W.

PY - 2001

Y1 - 2001

N2 - Small angle X-ray scattering (SAXS) expts. were performed on dil. aq. solns. of a new type of water-sol. ethyleneoxy-terminated poly(propyleneimine) dendrimer system. They reveal that the dimensions and d. distributions of the dendrimer are hardly affected by a change in the degree of protonation. This is in contrast to recent predictions regarding the structure of polyelectrolyte dendrimers but in line with the results of recent structural studies on charged PAMAM dendrimers. These dendrimer systems were applied as nanosized containers for guests like xanthene dyes. Structural studies with SAXS provide clear evidence for a complex formation but despite higher molar mass the max. dimensions of the complex are only slightly changed compared to the dendritic host. Since the radius of gyration represents the second moment of the electron d. distribution it appears to be very sensitive to changes in this distribution upon encapsulation of heavy-atom contg. guest mols. These are reflected in a decrease of the radius of gyration upon an increase of the guest-host ratio in the soln., a behavior that strongly indicates an accumulation of guest mols. in the center of the dendritic host. [on SciFinder (R)]

AB - Small angle X-ray scattering (SAXS) expts. were performed on dil. aq. solns. of a new type of water-sol. ethyleneoxy-terminated poly(propyleneimine) dendrimer system. They reveal that the dimensions and d. distributions of the dendrimer are hardly affected by a change in the degree of protonation. This is in contrast to recent predictions regarding the structure of polyelectrolyte dendrimers but in line with the results of recent structural studies on charged PAMAM dendrimers. These dendrimer systems were applied as nanosized containers for guests like xanthene dyes. Structural studies with SAXS provide clear evidence for a complex formation but despite higher molar mass the max. dimensions of the complex are only slightly changed compared to the dendritic host. Since the radius of gyration represents the second moment of the electron d. distribution it appears to be very sensitive to changes in this distribution upon encapsulation of heavy-atom contg. guest mols. These are reflected in a decrease of the radius of gyration upon an increase of the guest-host ratio in the soln., a behavior that strongly indicates an accumulation of guest mols. in the center of the dendritic host. [on SciFinder (R)]

M3 - Meeting Abstract

VL - 84

SP - 1014

EP - 1015

JO - Polymeric Materials: Science and Engineering

JF - Polymeric Materials: Science and Engineering

SN - 0743-0515

ER -