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Pore Modified FDU-12 as a Novel Container for Dendron Growth Junxing Han, Yueyun Lou, Xiaoyang Cai, Bruce C Gibb, and Daniel Francis Shantz J. Phys. Chem. C, Just Accepted Manuscript • DOI: 10.1021/acs.jpcc.7b05602 • Publication Date (Web): 20 Sep 2017 Downloaded from http://pubs.acs.org on September 28, 2017
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The Journal of Physical Chemistry
Pore Modified FDU-12 as a Novel Container for Dendron Growth Junxing Han§, Yueyun Lou§, Xiaoyang Cai‡, Bruce C. Gibb‡, and Daniel F. Shantz§,*
§
Department of Chemical and Biomolecular Engineering, Tulane University, 6823 St. Charles
Avenue, New Orleans, LA 70118, United States. Email:
[email protected] ‡
Department of Chemistry, Tulane University, 6823 St. Charles Avenue, New Orleans, LA
70118, United States.
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The Journal of Physical Chemistry
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ABSTRACT.
The synthesis and characterization of a suite of melamine dendrons on FDU-12 and pore-expanded FDU-12 are reported. FDU-12, a mesoporous material with cubic arrays of pores possessing cage apertures of approximately 4 nm is not an efficient support for growing dendrons. However, pore-expanded FDU-12 (PE-FDU-12) is an effective support, and it is an efficient substrate for growing dendrons with high free volumes, i.e. bulkier spacer diamines, as compared to SBA-15. Extensive MALDI and solution NMR on the cleaved dendrons validate the other analytical methods used and confirm that the target fragments are formed. The findings from this work illustrate the effect of the silica support’s pore topology on the synthesis of dendron materials on solid supports.
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The Journal of Physical Chemistry
INTRODUCTION Organic – inorganic hybrid materials have attracted interest for a wide range of technological applications.1-7
In contrast to composite materials where one has macroscopic
domains of two different components, true hybrid materials have molecular or nanometer dispersion
of
the
two
components.
This
coupling
of
the
desirable
thermal/electrical/magnetic properties of an inorganic component with the chemical diversity of the organic component has led to hybrid materials to be of interest in fields as diverse as medicine,8-9 microelectronics,10 catalysis11 and separations.5, 12
Clearly this is a field that
will continue grow in both basic scientific research and real-world applications.4-5, 13 Since the initial reports of ordered mesoporous silica (OMS)
14-16
and the subsequent
grafting of organic functional groups onto OMS in the late 1990’s17-20 a large body of literature has developed investigating the attachment of simple functional groups onto OMS materials.20-21
Numerous studies have elucidated how the grafting conditions lead to
different spatial arrangements of functional groups.20-22
That work and material testing23
have shown that high surface area OMS with low (
