atoms of 1,2,3-triazole moieties. This could be inferred from
the shapes of the CO adsorption isotherms for MTAF-3 and
MOF-508, and the steeper slope is the stronger interactions
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2
8
21
between the framework and CO gas molecules. We calculated
2
the heats of adsorption (Q ) of CO for MTAF-3 and MOF-508
st
2
based upon the CO adsorption isotherms at 273 K and 298 K
2
2
2
using the virial method. As shown in Fig. 2(c), MTAF-3
ꢀ
1
ꢀ1
exhibits a constant Qst of B29 kJ mol , which is B3 kJ mol
ꢀ
1
higher than that of MOF-508 (Qst of B26 kJ mol ). These
results further validate the contribution of 1,2,3-triazole moieties
9
J.-R. Li, Y. Ma, M. C. McCarthy, J. Sculley, J. Yu, H.-K. Jeong,
P. B. Balbuena and H.-C. Zhou, Coord. Chem. Rev., 2011,
255, 1791.
2
to the enhancement of CO uptake in MTAF-3.
In summary, the incorporation of 1,2,3-triazole moieties
into the prototypal pillared MOF, MOF-508, using the custom-
1
0 (a) J. Liu, P. K. Thallapally, B. P. McGrail, D. R. Brown and J. Liu,
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0
designed pillar ligand, 4,4 -(2H-1,2,3-triazole-2,4-diyl)dipyridine,
afforded a porous metal–triazolate framework, MTAF-3, which
demonstrates remarkable enhancement of CO uptake capacity
2
1
1
1 (a) M. Dinca and J. R. Long, Angew. Chem., Int. Ed., 2008,
4
by a factor of B3 and a significant increase in Q of CO by an
st
2
7, 6766; (b) G. Ferey, C. Serre, T. Devic, G. Maurin, H. Jobic,
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ꢀ1
average of B3 kJ mol compared to the parent MOF-508. The
strategy of incorporating 1,2,3-triazole functional groups that
provide moderate Lewis base centers into MOFs represents a
promising way to construct new types of porous MOFs with
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enhanced CO
laboratories includes the custom-design of new variants of
,2,3-triazole-based ligands for the construction of functional
2
uptake performances. Ongoing work in our
1
1
3 (a) Y. Li and R. T. Yang, Langmuir, 2007, 23, 12937; (b) S. Galli,
´
N. Masciocchi, V. Colombo, A. Maspero, G. Palmisano, F. J. Lopez-
MTAFs and exploring them for application in CO capture,
2
sensors and catalysis.
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´
´
´
J. A. R. Navarro, Chem. Mater., 2010, 22, 1664; (c) J. Liu,
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The authors acknowledge the University of South Florida
for financial support of this work. X. S. thanks the NSF for
financial support (Grant CHE-0844602).
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(
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z X-ray crystal data for MTAF-3: C66
56
H N
12
O
19Zn
4
, f
monoclinic, C2/c, a = 34.6925(7) A, b = 16.6027(4) A, c = 13.7633(3) A,
w
= 1582.71,
˚
˚
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ꢀ3
˚
V = 7646.4 (3) A, Z = 4, T = 228(2) K, rcalcd = 1.375 g cm
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This journal is c The Royal Society of Chemistry 2012