A pyrenyl linked calix[4]arene fluroionophore has been synthesized and used as a ditopic chemosensing ensemble for Fe3+ and H2PO4− using emission spectra. The detection limit of the synthesized receptor was found to be 0.88 pM for Fe3+ and 1.11 pM for H2PO4−. Moreover, this probe has been applied for recognition of Fe3+ in blood serum and H2PO4− in waste water.
![Graphical abstract: A pyrenyl linked calix[4]arene fluorescence probe for recognition of ferric and phosphate ions](http://hg.y866.cn/compound/lib/scimg/usr/1/C4RA04546G.jpg)
