Naphthazarin(5,8-dihydroxy-1,4-naphthoquinone) exhibited high selectivity for F
-, as compared with CN
-, Cl
-, Br
-, HSO
4-, H
2PO
4-, ClO
- and NO
3- in DMSO, which was attributed to the formation 1:1 complex. Interestingly, the blue color of the naphthazarin-F
- complex could be recovered after the addition of Cr
3+. We have investigated the ability of complex formation based on the association constant,
Kass; the binding ability for the complex formation of naphthazarin-F
- and Cr
3+ is much greater in DMSO (
Kass =5.3 × 10
4 M
-1) than that of the naphthazarin with F
- (
Kass = 2.0 × 10
3 M
-1).
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