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Updated: Feb 6, 2026

Fluorescence-Based Measurements of Phosphatidylserine/Phosphatidylinositol 4-Phosphate Exchange Between Membranes
Published on: March 14, 2021
Pyrene-Linked Formylated Bis(dipyrromethane): A Fluorescent Probe for Dihydrogen Phosphate
Chenxing Guo1, Shantao Sun1, Qing He1
1Department of Chemistry , The University of Texas at Austin , 105 East 24th Street, Stop A5300 , Austin , Texas 78712-1224 , United States.
Abstract:
Anion receptor 1, a pyrene-functionalized tetrakis-(1 H-pyrrole-2-carbaldehyde), binds tetrabutylammonium dihydrogen phosphate in chloroform with high affinity over other test salts. Fluorescence quenching is seen upon the addition of H2PO4- to 1. The limit of detection (LOD) is ca. 46 nM. Anion binding in the solid state was confirmed via X-ray diffraction analysis, which revealed a sandwich-type complex, [1·3TBAH2PO4]2, wherein two separate molecules of 1 are linked via six dihydrogen phosphate anions bound in an S-like fashion.
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