AI Article Synopsis
- An artificial light-harvesting dendrimer, 8P(Zn)P(FB), contains a focal freebase porphyrin and eight zinc(II) porphyrin wings, demonstrating significant changes in its photophysical properties when specific guest molecules are bound.
- UV/Vis titration studies revealed a strong 1:2 complex formation with meso-tetrakis(4-pyridyl)-porphyrin (TPyP), indicating high association constants for the binding process.
- Upon complex formation, the energy transfer efficiency from the zinc wings to the freebase core decreases markedly, shifting the process towards ultrafast electron transfer rather than energy transfer.
Article Abstract
An artificial light-harvesting multiporphyrin dendrimer (8P(Zn)P(FB)) composed of a focal freebase porphyrin (P(FB)) with eight zinc(II) porphyrin (P(Zn)) wings exhibited unique photophysical property switching in response to specific guest molecule binding. UV/Vis titration studies indicated stable 1:2 host-guest complex formation between 8P(Zn)P(FB) and meso-tetrakis(4-pyridyl)-porphyrin (TPyP) for which the first and second association constants were estimated to be >10(8) M(-1) and 3.0×10(7) M(-1), respectively. 8P(Zn)P(FB) originally shows 94% energy transfer efficiency from P(Zn) to the focal P(FB). By the formation of the host-guest complex (8P(Zn)P(FB)⋅2TPyP) the emission intensity of 8P(Zn)P(FB) is significantly decreased, and an ultrafast charge separation state is generated. The energy transfer process from P(Zn) wings to the P(FB) core in 8P(Zn)P(FB) is almost entirely switched to an electron transfer process by the formation of 8P(Zn)P(FB)⋅2TPyP.
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| http://dx.doi.org/10.1002/anie.201400835 | DOI Listing |
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