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Fig. 4.9 a
Synthetic route for sulfonate functionalized PPNs;
b
synthetic route for amine function-
alized PPNs;
c
77 K N
2
sorption isotherms and 295 K CO
2
adsorption isotherms. PPN-6 (
red
), PPN-
6-SO
3
H (
green
), PPN-6-SO
3
Li (
blue
), and PPN-6-SO
3
NH
4
(
black
);
d
N
2
adsorption and desorption
isotherms at 77 K and CO
2
adsorption and desorption isotherms, as well as PPN-6-CH
2
DETA N
2
adsorption, at 295 K. Reprinted with permission from Ref. [
57
]. Copyright 2013, Royal Society of
Chemistry. Reprinted with permission from Ref. [
58
]. Copyright 2012, Wiley-VCH
surface area of resulting product sharply decreases compared with the starting
materials (Fig.
4.9
c, d). Excitingly, both the sulfonate-grafted and amine-grafted
materials show higher CO
2
uptake than that of PAF-1. At 295 K and 1 bar, PPN-6-
CH
2
DETA exhibits exceptionally high CO
2
uptake with a value of 4.3 mmol g
−
1
(15.8 wt%), which is the highest among the microporous organic polymers
reported so far.
Our group also reported a post-modified method to change the properties of
PAF materials. PAF-18 [
33
] and PAF-26 [
51
] were synthesized using Sonogashira-
Hagihara cross-coupling reaction. Through introduction of functional groups into
