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A series of metal-organic loops templated by [SiMoO] and [β-MoO] anions using double chelating ligands: amperometric sensing and selective photocatalytic properties
By using the double chelating ligands 2,3-di-pyridin-2-yl-pyrazine (L 1 ) and 2,3-di-pyridin-2-yl-quinoxaline (L 2 ), six new polyoxometalate-based compounds, namely [Ag I 4 (L 1 ) 4 (SiMo 12 O 40 )] ( 1 ), [Cu II 6 (L 1 ) 6 (H 2 O) 6 (SiMo 12 O 40 ) 3 ]·6H 2 O ( 2 ), [Cu II (L 1 )(H 2 O)(β-Mo 8 O 2...
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| Published in: | New journal of chemistry 2019-07, Vol.43 (25), p.998-9988 |
|---|---|
| Main Authors: | , , , , , , |
| Format: | Article |
| Language: | English |
| Online Access: | Get full text |
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| Summary: | By using the double chelating ligands 2,3-di-pyridin-2-yl-pyrazine (L
1
) and 2,3-di-pyridin-2-yl-quinoxaline (L
2
), six new polyoxometalate-based compounds, namely [Ag
I
4
(L
1
)
4
(SiMo
12
O
40
)] (
1
), [Cu
II
6
(L
1
)
6
(H
2
O)
6
(SiMo
12
O
40
)
3
]·6H
2
O (
2
), [Cu
II
(L
1
)(H
2
O)(β-Mo
8
O
26
)
0.5
] (
3
), [Ag
I
2
(L
2
)(β-Mo
8
O
26
)
0.5
] (
4
), [Cu
II
(L
2
)(β-Mo
8
O
26
)
0.5
] (
5
) and [Zn
II
(L
2
)(β-Mo
8
O
26
)
0.5
] (
6
), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis, IR spectra and elemental analyses. Using the double chelating ligand L
1
, compounds
1-3
were obtained. In compound
1
, there is a tetra-nuclear Ag loop with four Ag atoms linked by four L
1
ligands. The [SiMo
12
O
40
]
4−
anions are sandwiched by these loops alternately. Compound
2
has a hexa-nuclear shield-like Cu cluster, in which six Cu atoms are connected by six L
1
ligands. The channel formed by the packing hexa-nuclear loops accommodates the [SiMo
12
O
40
]
4−
anions. By using [β-Mo
8
O
26
]
4−
instead of [SiMo
12
O
40
]
4−
, compound
3
was obtained containing a zigzag metal-organic chain. The chains are linked by [β-Mo
8
O
26
]
4−
anions to construct a layer. By changing L
1
to L
2
, compounds
4-6
containing metal-organic loops were built. In compound
4
, two L
2
ligands are linked by two Ag atoms to form a bi-nuclear loop. The [β-Mo
8
O
26
]
4−
anions as tetra-dentate inorganic subunits link bi-nuclear loops to build a 2D layer. Compounds
5
and
6
are isostructural, with bi-nuclear Cu/Zn-L
2
loops connected by [β-Mo
8
O
26
]
4−
anions alternately to construct a 1D chain. In addition, we also studied the electrochemical properties and selective photocatalytic properties of compounds
1-6
.
By changing the POM anions and TM ions, a series of compounds with multi-nuclear loops was formed. |
|---|---|
| ISSN: | 1144-0546 1369-9261 |
| DOI: | 10.1039/c9nj02224d |