The fluorescent sensor 3 based on the 1,3-alternate conformation of thiacalix[4]arene bearing the coumarin fluorophore via an imino group has been synthesized. The sensing properties were evaluated in terms of a colorimetric and fluorescence sensor for Zn 2+ and F -. High selectivity and excellent sensitivity were exihibited, and "off-on" optical behavior in different media was observed. Changes were all visible to the naked eye, whilst the presence of the Zn 2+ and Finduces fluorescence enhancement and the formation of a 1:1 complex with sensor 3. In addition, the sensor 3 has low cytotoxicity and good cell permeability, and can readily be employed for assessing the change of intracellular Zn 2+ and Flevels.
In the title compound, [Tb(C
10
H
8
N
2
O
2
)
4
(H
2
O)
4
][W(CN)
8
], both metal atoms are eight-coordinated. The Tb
III
ion displays a dodecahedral geometry, while the W
v
ion exhibits a distorted square-antiprismatic geometry. The Tb atoms are located on a special position of site symmetry -4, whereas the W atoms are located on a twofold rotation axis. The cations are linked by O—H⋯O hydrogen bonds. The title compound is isotypic with the corresponding and previously described Mo compound [Qian & Yuan (2011
▶
).
Acta Cryst.
E
67
, m845].
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