Chemistry Reference
In-Depth Information
Fig. 6.5 a
Fluorescence image of TP-COF;
b
(a) I-V profile of a 10-mm-wide Pt gap (
black
curve
without TP-COF;
blue
curve
with TP-COF;
red
curve
with iodine-doped TP-COF;
c
Electric
current when 2 V bias voltage is turned on or off. Reprinted with permission from Ref. [
13
].
Copyright 2008, Wiley-VCH
Fig. 6.6 a
The synthesis of the nickel phthalocyanine covalent organic framework (NiPc-COF) by
a boronate esterification reaction;
b
eclipsed stack of phthalocyanine 2D sheets and microporous
channels in NiPc-COF (a 2
2 grid is shown). Colors used for identification: phthalocyanine unit:
sky
blue
; Ni
green
, N
violet
, C
gray
, O
red
, B
orange
, H
white
. Reprinted with permission from
Ref. [
14
]. Copyright 2011, Wiley-VCH
Porphyrin is another representative macrocycle with extended
π
conjugation,
thus promoting the synthesis of porphyrin contained COFs. The studies indicated
that the moving of charge carriers in 2D MP-COFs depend not only on the skel-
etons but also on the central metals in the macrocycles. The 2D porphyrin COFs
containing different central metals (MP-COFs) COFs show a tunable charge car-
rier transport quality (Fig.
6.8
) [
16
]. When inserting a copper central metal ion,
CuP-COF leads to an electron transport along the framework. Meanwhile, the
metal-free porphyrin COF is hole-conducting. By contrast, the ZnP-COF shows
ambipolar charge transport properties. Flash-photolysis time-resolved microwave
conductivity (FP/TRMC) methods under argon atmosphere indicate the total capa-
bility of carrier (electrons and holes) mobilities.
