Construction of Supramolecular Polymers with Different Topologies by Orthogonal Self-Assembly of Cryptand-Paraquat Recognition and Metal Coordination

Recently, metal-coordinated orthogonal self-assembly has been used as a feasible and efficient method in the construction of polymeric materials, which can also provide supramolecular self-assembly complexes with different topologies. Herein, a cryptand with a rigid pyridyl group on the third arm derived from BMP32C10 was synthesized. Through coordination-driven self-assembly with a bidentate organoplatinum(II) acceptor or tetradentate Pd(BF4)(2)center dot 4CH(3)CN, a di-cryptand complex and tetra-cryptand complex were prepared, respectively. Subsequently, through the addition of a di-paraquat guest, linear and cross-linked supramolecular polymers were constructed through orthogonal self-assembly, respectively. By comparing their proton nuclear magnetic resonance (H-1 NMR) and diffusion-ordered spectroscopy (DOSY) spectra, it was found that the degrees of polymerization were dependent not only on the concentrations of the monomers but also on the topologies of the supramolecular polymers.

Automated summary

Metal-coordinated orthogonal self-assembly has been used to construct polymeric materials with different topologies, providing supramolecular complexes. Di-cryptand and tetra-cryptand complexes were prepared through coordination-driven self-assembly, leading to the construction of linear and cross-linked supramolecular polymers. The degree of polymerization was found to be dependent on both monomer concentrations and supramolecular polymer topologies based on proton nuclear magnetic resonance and diffusion-ordered spectroscopy spectra.