Supramolecular complex of a fused zinc phthalocyanine-zinc porphyrin dyad assembled by two imidazole-Cunits: ultrafast photoevents.

Title Supramolecular complex of a fused zinc phthalocyanine-zinc porphyrin dyad assembled by two imidazole-Cunits: ultrafast photoevents.
Authors J. Follana-Berná; S. Seetharaman; L. Martín-Gomis; G. Charalambidis; A. Trapali; P.A. Karr; A.G. Coutsolelos; F. Fernández-Lázaro; F. D'Souza; Á. Sastre-Santos
Journal Phys Chem Chem Phys
DOI 10.1039/c8cp00382c
Abstract

A new zinc phthalocyanine-zinc porphyrin dyad (ZnPc-ZnP) fused through a pyrazine ring has been synthesized as a receptor for imidazole-substituted C(CIm) electron acceptor. Self-assembly via metal-ligand axial coordination and the pertinent association constants in solution were determined byH-NMR, UV-Vis and fluorescence titration experiments at room temperature. The designed host was able to bind up to two CIm electron acceptor guest molecules to yield CIm:ZnPc-ZnP:ImCdonor-acceptor supramolecular complex. The spectral data showed that the two binding sites behave independently with binding constants similar in magnitude. Steady-state fluorescence studies were indicative of an efficient singlet-singlet energy transfer from zinc porphyrin to zinc phthalocyanine within the fused dyad. Accordingly, the transient absorption studies covering a wide timescale of femto-to-milli seconds revealed ultrafast energy transfer fromZnP* to ZnPc (k? 10s) in the fused dyad. Further, a photo induced electron transfer was observed in the supramolecularly assembled CIm:ZnPc-ZnP:ImCdonor-acceptor complex leading to charge separated states, which persisted for about 200 ns.

Citation J. Follana-Berná; S. Seetharaman; L. Martín-Gomis; G. Charalambidis; A. Trapali; P.A. Karr; A.G. Coutsolelos; F. Fernández-Lázaro; F. D'Souza; Á. Sastre-Santos.Supramolecular complex of a fused zinc phthalocyanine-zinc porphyrin dyad assembled by two imidazole-Cunits: ultrafast photoevents.. Phys Chem Chem Phys. 2018;20(11):77987807. doi:10.1039/c8cp00382c

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