A novel diarylethene-based photoswitchable chelator for reversible release and capture of Ca^sup 2+^ in aqueous media

The synthesis and characterisation of a novel Reversibly Photoswitchable Chelator (RPC) of calcium ions, designed as a stepping stone towards producing pulses of calcium concentration in an aqueous environment, is reported. This RPC is constituted of a photochromic diarylethene core connected on one...

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Published inJournal of photochemistry and photobiology. A, Chemistry. Vol. 360; p. 181
Main Authors Dozova, Nadia, Pousse, Guillaume, Barnych, Bogdan, Mallet, Jean-Maurice, Cossy, Janine, Valeur, Bernard, Plaza, Pascal
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier BV 01.06.2018
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Summary:The synthesis and characterisation of a novel Reversibly Photoswitchable Chelator (RPC) of calcium ions, designed as a stepping stone towards producing pulses of calcium concentration in an aqueous environment, is reported. This RPC is constituted of a photochromic diarylethene core connected on one side to a BAPTA (1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid) calcium chelator and, on the other side, to an electron-withdrawing group. The operation principle consists in photoswitching on and off an intramolecular charge transfer between one nitrogen atom of the BAPTA moiety and the electron-withdrawing group, thereby modulating the chelating affinity of BAPTA for calcium ions. Solubility of the compound in a partially aqueous solvent was achieved by grafting a short PEG (polyethylene glycol) tail to the electron-withdrawing group. A reduction of the affinity for calcium ions upon photoswitching by a factor of 3–4, in the hundred nM range of dissociation constant, is reported and constitutes a proof of concept of this type of RPC.
ISSN:1010-6030
1873-2666