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A series of two-dimensional microporous triazole-functionalized metal–organic frameworks with the new multi-dentate ligand 1-(4-aminobenzyl)-1,2,4-triazole: single-crystal-to-single-crystal transformation, structural diversity and luminescent sensing
In this work a new flexible multi-dentate 1-(4-aminobenzyl)-1,2,4-triazole (abtz) ligand has been designed and synthesized, and a series of two-dimensional (2D) triazole-functionalized metal–organic frameworks, namely {[Cd(abtz) 2 (H 2 O) 2 ]·(ClO 4 ) 2 ·H 2 O} n ( 1 ), {[Cd(abtz) 2 (H 2 O) 2 ]·(SiF...
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| Published in: | RSC advances 2015-01, Vol.5 (44), p.35238-35251 |
|---|---|
| Main Authors: | , , , , , , , , |
| Format: | Article |
| Language: | English |
| Subjects: | |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | In this work a new flexible multi-dentate 1-(4-aminobenzyl)-1,2,4-triazole (abtz) ligand has been designed and synthesized, and a series of two-dimensional (2D) triazole-functionalized metal–organic frameworks, namely {[Cd(abtz)
2
(H
2
O)
2
]·(ClO
4
)
2
·H
2
O}
n
(
1
), {[Cd(abtz)
2
(H
2
O)
2
]·(SiF
6
)}
n
(
2
), {[Cd(abtz)
2
(H
2
O)
2
]·(ClO
4
)
1.64
·(HSO
4
)
0.36
·1.36H
2
O}
n
(
3
), {[Cd(abtz)
2
(NCS)]·(ClO
4
)}
n
(
4
) and {[Ag
2
(
μ
2
-abtz) (
μ
3
-abtz)(ClO
4
)]·(ClO
4
)}
n
(
5
) have been isolated. Firstly, when abtz and corresponding cadmium(
ii
) salts are employed, new rectangular-grid 2D coordination frameworks containing free ClO
4
−
or SiF
6
2−
anions, {[Cd(abtz)
2
(H
2
O)
2
]·(ClO
4
)
2
·H
2
O}
n
(
1
) and{[Cd(abtz)
2
(H
2
O)
2
]·(SiF
6
)}
n
(
2
), can be isolated. Furthermore, in
1
weakly H-bonded ClO
4
−
anions present within the voids can be partly exchanged by HSO
4
−
anions to generate the anion exchanged crystalline product {[Cd(abtz)
2
(H
2
O)
2
]·(ClO
4
)
1.64
·(HSO
4
)
0.36
·1.36H
2
O}
n
(
3
) in single-crystal-to-single-crystal (SC–SC) manner. On the other hand,
1
can be used as a precursor to react with NH
4
NCS to obtain the 2D bilayer framework {[Cd(abtz)
2
(NCS)]·(ClO
4
)}
n
(
4
) under hydrothermal conditions. This also presents a novel example of structural transformation with bond rupture/formation from a mono-layer framework
1
to a 2D bi-layer framework
4
. Furthermore, when AgClO
4
is used to replace Cd(ClO
4
)
2
in the reaction system, another 2D layer framework {[Ag
2
(
μ
2
-abtz)(
μ
3
-abtz) (ClO
4
)]·(ClO
4
)}
n
(
5
) with unique (2,4,5) connected topology can be isolated. The solid state luminescence properties and PXRD patterns of
1–5
have been investigated. Additionally, luminescence measurements illustrate that complexes
4
and
5
represent novel examples as luminescent probes of new sensing materials.
4
shows highly sensitive response to acetone and Fe
3+
. Besides,
5
is the first report of multidimensional polymers based on triazole derivatives with luminescent response to small biological molecules such as vitamin C in water solutions. |
|---|---|
| ISSN: | 2046-2069 2046-2069 |
| DOI: | 10.1039/C5RA04381F |