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- Title
Vibrational fingerprint of localized excitons in a two-dimensional metal-organic crystal.
- Authors
Corva, M.; Ferrari, A.; Rinaldi, M.; Feng, Z.; Roiaz, M.; Rameshan, C.; Rupprechter, G.; Costantini, R.; Dell’Angela, M.; Pastore, G.; Comelli, G.; Seriani, N.; Vesselli, E.
- Abstract
Long-lived excitons formed upon visible light absorption play an essential role in photovoltaics, photocatalysis, and even in high-density information storage. Here, we describe a self-assembled two-dimensional metal-organic crystal, composed of graphene-supported macrocycles, each hosting a single FeN4 center, where a single carbon monoxide molecule can adsorb. In this heme-like biomimetic model system, excitons are generated by visible laser light upon a spin transition associated with the layer 2D crystallinity, and are simultaneously detected via the carbon monoxide ligand stretching mode at room temperature and near-ambient pressure. The proposed mechanism is supported by the results of infrared and time-resolved pump-probe spectroscopies, and by ab initio theoretical methods, opening a path towards the handling of exciton dynamics on 2D biomimetic crystals.
- Publication
Nature Communications, 2018, Vol 9, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-018-07190-1