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Efficient and robust photocatalysts based on {PW} modified by an Ag complex
Ist Teil von
Dalton transactions : an international journal of inorganic chemistry, 2018-03, Vol.47 (12), p.4273-4281
Ort / Verlag
England: Royal Society of Chemistry
Erscheinungsjahr
2018
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Two novel Wells-Dawson polyoxometalate-based compounds, (H
2
bimb)
2
[{Ag
1.5
(bimb)
1.5
}(P
2
W
18
O
62
)] (
1
), (H
2
bimb)
2
[Ag(bimb)]
0.5
[Ag(eim)
2
]
0.5
[P
2
W
18
O
62
]·H
3
O (
2
) (bimb = 1,4-bis(imidazole-l-yl)butane, eim = ethyl(imidazole)), have been synthesized under hydrothermal conditions and characterized by IR, thermogravimetric, XRD and single-crystal X-ray diffraction analyses. In compound
1
, two "U"-type bimb ligands are connected together
via
π interactions of Ag-C to form a ring unit. The ring unit alternately links with the "Z"-type bimb
via
an Ag-N bond to form an infinite Z-shaped {Ag
4
(bimb)
3
}
n
chain. The adjacent two {P
2
W
18
} clusters bonded to two Ag1 ions on two adjacent Z-shaped chains to form an inorganic dimer linker, which further joins the Z-shaped chains together, resulting in unique organic-inorganic alternating 2-D layers. Adjacent 2D layers are further aggregated together
via
Ag-O bonds between the Dawson cluster and the Z-type chain on different layers to yield a 3-D network with a new topology {10
3
}
2
{10}{4·10
2
}
4
{4
2
·10
4
}
2
. In compound
2
, the eim ligand was synthesized
in situ
from bimb, which acts as a small molecular ligand to alter the structure and adjust the catalytic activity of compound
2
. Each Ag2 connects with the bimb ligand to form a linear {Ag(bimb)} chain. Adjacent chains are bonded together
via
the bimb ligand to generate a supermolecule 2-D layer, in which a Dawson dimer cluster as a guest molecule is embedded in both sides of the layer through supermolecule interactions. Such 2-D layers are further supported by Ag(eim)
2
units leading to 3D supermolecule nets. In addition, the compounds exhibit excellent electrocatalytic behavior and better photocatalytic degradation capability for typical dyes than other Wells-Dawson POMs.
Ag
+
and the flexible ligand bimb were introduced into Dawson phosphomolybdate systems as linkage units to induce two fascinating 3-D inorganic-organic networks, which exhibit excellent electro- and photo-catalytic behavior.