AI Article Synopsis
- The study discusses flexible Pd(L) complexes that self-recognize through π-π interactions, which makes it difficult for them to associate with aromatic targets in solution.
- The complex can reversibly transform into an 'open' macrocycle by introducing additional metal ions, thanks to bidentate binding sites in the ligand that include 2-pyridyl-1,2,3-triazole and bis-1,2,3-triazole.
- This controlled process allows for switching between two distinct species, enhancing the interaction of the macrocycle with molecular substrates and regulating guest binding.
Article Abstract
We report flexible [Pd(L) ] complexes where there is self-recognition, driven by π-π interactions between electron-rich aromatic arms and the cationic regions they are tethered to. This self-recognition hampers the association of these molecules with aromatic molecular targets in solution. In one case, this complex can be reversibly converted to an 'open' [Pd (L) ] macrocycle through introduction of more metal ion. This is accomplished by the ligand having two bidentate binding sites: a 2-pyridyl-1,2,3-triazole site, and a bis-1,2,3-triazole site. Due to favourable hydrogen bonding, the 2-pyridyl-1,2,3-triazole units reliably coordinate in the [Pd(L) ] complex to control speciation: a second equivalent of Pd(II) is required to enforce coordination to bis-triazole sites and form the macrocycle. The macrocycle interacts with a molecular substrate with higher affinity. In this fashion we are able to use stoichiometry to reversibly switch between two different species and regulate guest binding.
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