Proof of principle of a purine D-A-D' ligand based ratiometric chemical sensor harnessing complexation induced intermolecular PET.

Justina Jovaisaite, Dace Cīrule, Andris Jeminejs, Irina Novosjolova, Māris Turks, Paulius Baronas, Regimantas Komskis, Sigitas Tumkevicius, Gediminas Jonusauskas, Saulius Jursenas

Physical chemistry chemical physics : PCCP 2020 Nov 25

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A comprehensive photophysical study of a series of purines, doubly decorated at C2 and C6 positions with identical fragments ranging from electron acceptor to donor groups of different strengths, is presented. The asymmetry of substitutions creates a unique molecular D-A-D' structure possessing two independent electronic charge transfer (CT) systems attributed to each fragment and exhibiting dual-band fluorescence. Moreover, the inherent property of coordination of metal ions by purines was enriched due to a presence of nearby triazoles used as spacers for donor or acceptor fragments. New molecules present a bidentate coordination mode, which makes the assembly of several ligands with one metal cation possible. This property was exploited to create a new concept of a ratiometric chemical fluorescence sensor involving the photoinduced electron transfer between branches of different ligands as a mechanism of fluorescence modulation.

Citation

Justina Jovaisaite, Dace Cīrule, Andris Jeminejs, Irina Novosjolova, Māris Turks, Paulius Baronas, Regimantas Komskis, Sigitas Tumkevicius, Gediminas Jonusauskas, Saulius Jursenas. Proof of principle of a purine D-A-D' ligand based ratiometric chemical sensor harnessing complexation induced intermolecular PET. Physical chemistry chemical physics : PCCP. 2020 Nov 25;22(45):26502-26508