Zinc porphyrin dimers and trimers, in which the porphyrins are connected via a ruthenium metal core, exhibit large third-order nonlinear optical absorption coefficients and refractive indices. These properties are a result of the presence of multiple porphyrins, which lead to an extension of the π-conjugated system and the octupolar effect.
M. de Torres, S. Semin, I. Razdolski, J. Xu, J. A. A. W. Elemans, T. Rasing, A. E. Rowan and R. J. M. Nolte, Chem. Commun., 2015, 51, 2855 DOI: 10.1039/C4CC09592H
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