Hierarchical Assemblies of Unsymmetric Pt Complexes with Ag Ions: Two Types of Assembly Modes Depending on the Remote Ancillary Groups in the Bridging Ligands
A research group led by Professor Keisuke Umakoshi of the Graduate School of Science and Technology at Nagasaki University and Lecturer Shinnosuke Horiuchi of the Graduate School of Arts and Sciences at the University of Tokyo (formerly an Assistant Professor at Nagasaki University’s Graduate School of Engineering) has published a study on hierarchical self-assembly in supramolecular chemistry. In this study, they successfully controlled and observed this process at the molecular level in a stepwise manner by sequentially reacting Ag(I) ions with asymmetric mononuclear Pt(II) complex units.
Self-assembly via noncovalent interactions can amplify small structural differences in small molecular units, producing large supramolecular architectures with structure-dependent complexity and characteristics. In this paper, the unique self-assembly behaviors of mononuclear Pt(II) complex units accommodating Ag(I) ions are reported. The Pt complex with the N^C chelating ligand and two different kinds of pyrazole ligands gave two regioisomers, whose structural difference was only the position of the N and C donor atoms in the N^C chelating ligands. This small structural difference influences the assembled structures with Ag ions, producing two different types of heteropolynuclear complexes with different clustering motifs. This was further amplified via a hierarchical assembly process incorporating additional Ag ions to afford two different types of Pt-Ag cluster-of-cluster complexes. This study proves that the self-assembly of unsymmetrical fragments can endow significant complexity and perturbation in molecular systems, enabling the observation of unique molecular behaviors.
Journal: Chemistry – A European Journal
Title: Hierarchical Assemblies of Unsymmetric Pt Complexes with Ag Ions: Two Types of Assembly Modes Depending on the Remote Ancillary Groups in the Bridging Ligands
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Publication Date: April 3, 2025
For more details, please see the full article in Chemistry – A European Journal.
