NDLI: Reversible tuning of pore size and CO<sub>2</sub> adsorption in azobenzene functionalized porous organic polymers

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Wei Zhu, Youlong
Copyright Year	2014
Abstract	A series of responsive porous organic polymers (POPs), UCBZ-1, 2, 3 and 4, comprising azobenzene moieties, were synthesized through dynamic imine chemistry and their structure–property relationship was studied. The resulting porous organic polymers showed permanent porosity with BET surface areas of around 1000 m2 g−1. More importantly, these polymers exhibit fully reversible responsive pore size distribution and CO2 uptake triggered by UV irradiation or heat treatment. We observed the transformation of some micropores with pore size around 14 Å to larger ones (17 Å) upon UV irradiation. Although the BET surface areas remain almost constant during the isomerization process, trans to cis conversion of the azobenzene groups significantly increases CO2 uptake (up to 29% at 273 K and 1 atm) of the frameworks. Our study on the structure–property relationship shows that the bulkiness of the azobenzene moieties reduces the extent of responsiveness of the materials. Such a photoresponsive behavior is largely attributed to the enhanced dipole–quadrupole interaction between CO2 and the frameworks due to the increased dipole moment of cis –NN– groups compared to trans –NN–. Such responsiveness significantly differs from the previously reported responsive MOFs containing azobenzene groups, which release CO2 upon trans to cis isomerization. These polymers thus represent a new class of porous polymers having intriguing stimuli-responsive properties for advanced applications.
Starting Page	4957
Ending Page	4961
Page Count	5
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	5
Issue Number	12
Journal	Chemical Science
DOI	10.1039/c4sc02305f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	BET Organic chemistry Isomerization Dipole Imine Porosity Azobenzene
Content Type	Text
Resource Type	Article
Subject	Chemistry

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