JOVAISAITE, Justina; CĪRULE, Dace; JEMINEJS, Andris; NOVOSJOLOVA, Irina; TURKS, Māris; BARONAS, Paulius; KOMSKIS, Regimantas; TUMKEVICIUS, Sigitas; JONUSAUSKAS, Gediminas; JURSENAS, Saulius

doi:10.1039/d0cp04091f

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Physical Chemistry Chemical Physics. 2020-11-25, vol. 22, n° 45, p. 26502-26508

Royal Society of Chemistry

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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-AD 0 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.< Réduire

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Proof of principle of a purine D–A–D′ ligand based ratiometric chemical sensor harnessing complexation induced intermolecular PET

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