Exploring the Ellipsoidal and Core-Shell Geometries of Copper-Seamed C-alkylpyrogallol[4]arene Nanocapsules in Solution

Published

October 3, 2011

Author(s)

Harshita Kumari, Steven R. Kline, Nathaniel J. Schuster, Charles L. Barnes, Jerry L. Atwood

Abstract

Small-angle neutron scattering (SANS) studies were used to probe the stability and geometry of copper-seamed Calkylpyrogallol[ 4]arene (PgCnCu; n = 11, 13, 17) hexamers in solution. Novel structural features are observed at chain lengths greater than 10 in both solid and solution phase. Scattering data for the PgC₁₁Cu and PgC₁₃Cu in chloroform fitted as core-shell spheres with total spherical radius of about 22.7 Å and 22.9 Å respectively. On the other hand, the scattering curve for PgC17Cu hexamer at both 1% and 5% mass fraction in o-xylene did not fit as a discrete sphere but rather as a uniform ellipsoid. The geometric dimensions of the ellipsoid radii are 24 Å along the minor axis and 115 Å along the major axis. It is expected that an individual hexamer with heptadecyl chains would exhibit a uniform radius of ca. 24 Å. However, an approximate ratio of 1:5 between radii lengths for the minor axis and major axis is consistent with interpenetration of the heptadceyl chains of adjacent hexamers to form a single ellipsoidal assembly.

Citation

Journal of the American Chemical Society

Volume

133

Pub Type

Journals

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Keywords

molecular capsules, small-angle neutron scattering, metal-organic nanocapsules

Citation

Kumari, H. , Kline, S. , Schuster, N. , Barnes, C. and Atwood, J. (2011), Exploring the Ellipsoidal and Core-Shell Geometries of Copper-Seamed C-alkylpyrogallol[4]arene Nanocapsules in Solution, Journal of the American Chemical Society, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=909595 (Accessed December 26, 2024)