Data from: 'Bottled' spiro-doubly aromatic trinuclear [Pd2Ru]+ complexes

The central unit of the synthesized structure is a Ru atom which is the vertex of the [RuPd2]+ triangle being the first example of mixed triangles among these metals. Moreover, Ru is involved in both σ- and π-aromaticity. σ-aromaticity is realized as the d-AO based multicenter bond which is delocalized over the inner [RuPd2]+ triangle with considerable contribution from the sulfur electron density. Besides, transition metals are known to interact with the electron cloud of benzene which, in turn, leads to the charge transfer and formation of conjugated electron density between the TM and benzene. The second type of aromaticity, π-aromaticity, is caused by this interaction and represented via d-AOs of Ru interacting with the benzene electron cloud. The doubly aromatic behavior is supported by MO and AdNDP (Adaptive Natural Density Partitioning) analyses. This doubly aromatic bonding pattern can also be described in terms of spiroaromaticity.