AI Article Synopsis
- The study focuses on how to attach chromophores, specifically porphyrins, to metal surfaces for creating advanced photonic devices and light-harvesting systems.
- The researchers achieved this by using a self-assembly technique to position the porphyrins upright on a gold surface (Au(111)), which was validated through various methods like STM and absorption spectroscopy.
- The study reveals that while the smaller porphyrins can rotate freely due to their design, the larger triphenylporphyrin is constrained in its movement due to its size and interactions with neighboring molecules, leading to a specific alignment.
Article Abstract
The controlled attachment of chromophores to metal or semiconducting surfaces is a prerequisite for the construction of photonic devices and artificial surface-based light-harvesting systems. We present an approach to mount porphyrins in ordered monolayers on Au(111) by self-assembly and verify it, employing STM, absorption spectroscopy, and quantum chemical calculations. The usual adsorption geometry of planar chromophores, flat on the surface or densely packed edge-on, is prevented by mounting the porphyrins upright on a molecular platform. An ethynyl unit as spacer and pivot joint provides almost free azimuthal rotation of the unsubstituted porphin. However, rotation of the larger triphenylporphyrin unit is sterically restricted: because the diameter of the substituted porphyrin is larger than the distance to its next neighbors, the phenyl substituents of neigboring molecules interact by dispersion force, which leads to an alignment of the azimuthal rotators.
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| http://dx.doi.org/10.1021/ja505563e | DOI Listing |
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