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A silver-alkynyl cluster encapsulating a fluorescent polyoxometalate core: enhanced emission and fluorescence modulationElectronic supplementary information (ESI) available: Crystal data. CCDC 1039036 for 1. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c4dt03826f
A new silver( i )-alkynyl cluster with a [Eu(W 5 O 18 ) 2 ] 9− polyoxoanionic core of [Ag 42 {Eu(W 5 O 18 ) 2 }( t BuC&z.tbd;C) 28 Cl 4 ] [OH]·H 2 O ( 1 ) has been designed and synthesized. The [Eu(W 5 O 18 ) 2 ] 9− polyoxoanion acts as a template to induce the formation of the surrounding 42-co...
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| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Online Access: | Get full text |
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| Summary: | A new silver(
i
)-alkynyl cluster with a [Eu(W
5
O
18
)
2
]
9−
polyoxoanionic core of [Ag
42
{Eu(W
5
O
18
)
2
}(
t
BuC&z.tbd;C)
28
Cl
4
] [OH]·H
2
O (
1
) has been designed and synthesized. The [Eu(W
5
O
18
)
2
]
9−
polyoxoanion acts as a template to induce the formation of the surrounding 42-core Ag(
i
) cage. Due to the hydrophobic silver(
i
)-alkynyl shell,
1
features an unusual fluorescence enhancement as compared to the precursor of the [Eu(W
5
O
18
)
2
]
9−
polyoxoanionic core. Interestingly, the silver ions in the shell silver(
i
)-alkynyl cage can only be reduced to silver atoms by irradiation with high energy UV light (2 kW). Upon high UV irradiation, fluorescence quenching of
1
has been observed. Moreover, the solution fluorescence of
1
can be modulated by addition of S
2−
ions into the system, which also leads to the fluorescence quenching phenomenon. The successful synthesis of
1
demonstrates a new route to the detection of high energy UV irradiation or S
2−
ions by elaborate design of fluorescence quenching of silver(
i
)-alkynyl clusters.
A fluorescent polyoxometalate-based silver(
i
)-alkynyl cluster exhibits sensitivity towards high energy UV irradiation and selectivity for detection of S
2−
. |
|---|---|
| ISSN: | 1477-9226 1477-9234 |
| DOI: | 10.1039/c4dt03826f |