A Hierarchical Self-Assembly System Built Up from Preorganized Tripodal Helical Metal Complexes

Abstract

The hierarchical organization strategy has realized elaborate supramolecular structures that are difficult to achieve by a one-pot thermodynamically driven self-assembly. Self-assembly via Schiff base formation of the preorganized tripodal helical unit 2(2+), which is composed of the tris(bipyridyl) ligand 1 and octahedral metal ion (Ru(II) and Fe(II)), lead to two supramolecular structures, i.e., a macrobicyclic dimer and an interlocked helicate. Notably, the interlocked helicate had a unique motif with an elongated shape (∼ 58 Å) and linearly aligned metal centers with homochiral configurations (all-Δ or all-Λ), which shows potential for allosteric regulation based on the long-range transmittance of the structural information.

Molecular recognition by multiple metal coordination inside wavy-stacked macrocycles

“…Reversible imine bonds are often utilized for the construction of thermodynamically stable target products 19–21 , and most of them were constructed by mixing aldehyde and amine building blocks 22–24 . Here, H 6 1 was synthesized from a bifunctional monomer 3 possessing both o -aminophenol and 2-formylpyridine moieties (Fig.…”

Self-Assembly by Tridentate or Bidentate Ligand: Synthesis and Vapor Adsorption Properties of Cu(II), Zn(II), Hg(II) and Cd(II) Complexes Derived from a Bis(pyridylhydrazone) Compound

“…Pyridyl moiety is probably the most popular building block for the construction of metal-organic networks due to its strong coordination ability to metal ions [25][26][27]. In recent years, bis(pyridylhydrazone) ligands are often used in the construction of novel supramolecular architectures and promising candidates for metallo-anion receptors.…”

Chirality in rotaxanes and catenanes

“…16a ). 50 , 51 An even more complex system was described by Hardie and co-workers. Ligand 37 assembles under thermodynamic control in the presence of Zn II ions to give triply interlocked [2]catenane 38 composed of two interlocked macrocycles derived from two equivalents of 37 .…”