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Investigates π-stacking in ligands with Pd(II) complexes, suggesting enhanced interactions.
Square-planar transition-metal complexes supported with appropriate ligands can self-assemble via interfacing ligation planes. Here, we present solid-phase (X-ray crystallography) and solution-phase (1H NMR) data that suggest the monomeric (L1)PdCl units π-stack, e.g. manifesting in dimeric adducts, while corresponding free ligand (L1)H does not. Concentration-dependent 1H NMR in CDCl3 indicates the aggregates form with apparent Kdimer ∼ 58 M–1. We propose that exchanging the “H+” of the ligand with the Lewis acidic “[PdCl]+” amplified the native donor–acceptor behavior of the free aurone ligand.
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Imgrund et al. (2026) studied this question.
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