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An unprecedented dumbbell-shaped pentadeca-nuclear W-Er heterometal cluster stabilizing nanoscale hexameric arsenotungstate aggregate and electrochemical sensing properties of its conductive hybrid film-modified electrode
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An unprecedented dumbbell-shaped pentadeca-nuclear W-Er heterometal cluster stabilizing nanoscale hexameric arsenotungstate aggregate and electrochemical sensing properties of its conductive hybrid film-modified electrode
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An unprecedented dumbbell-shaped pentadeca-nuclear W-Er heterometal cluster stabilizing nanoscale hexameric arsenotungstate aggregate and electrochemical sensing properties of its conductive hybrid film-modified electrode
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Journal Article
An unprecedented dumbbell-shaped pentadeca-nuclear W-Er heterometal cluster stabilizing nanoscale hexameric arsenotungstate aggregate and electrochemical sensing properties of its conductive hybrid film-modified electrode
2022
Overview
Cluster-based functional materials have made remarkable progress owing to their wonderful structures and distinctive physicochemical performances, one of on-going advancements of which is basically driven by synthetic chemistry of exploring and constructing novel nanosized gigantic polyoxometalate (POM) aggregates. In this article, an unprecedented nanoscale hexameric arsenotungstate aggregate Na
9
K
16
H
4
[Er
0.5
K
0.5
(H
2
O)
7
][Er
5
W
10
O
26
(H
2
O)
14
][B-
α
-AsW
9
O
33
]
6
·102H
2
O (
1
) has been synthesized by the combined synthetic strategy of simultaneously using the arsenotungstate precursor and simple tungstate material in a highly acidic aqueous solution. The {[Er
5
W
10
O
26
(H
2
O)
14
][B-α-AsW
9
O
33
]
6
}
31−
polyanion in
1
consists of an intriguing dumbbell-shaped pentadeca-nuclear W-Er heterometal {Er
5
W
10
O
26
(H
2
O)
14
}
23+
cluster connecting six trilacunary [B-α-AsW
9
O
33
]
9−
moieties, which has never been seen previously. Furthermore, through electropolymerization of
1
and pyrrole on the conductive substrate, a thickness-controllable and robust
1
-PPY (PPY = polypyrrole) hybrid film was successfully prepared, which represents the first POM-PPY film assembled from high-nuclear lanthanide (Ln) encapsulated POM and PPY hitherto. The
1
-PPY film-based electrochemical biosensor exhibits a favorable recognition performance for ochratoxin A in multiple media. This work not only provides a feasible combined synthetic strategy of the POM precursor and simple tungstate material for constructing complicated multi-Ln-inserted POM aggregates, but also offers a promising electrochemical platform constructed from POM-based conductive films for identifying trace biomolecules in complex environments.
Publisher
Tsinghua University Press
