Abstract
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•4CH3CN, 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 (1H 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.
Highlights
Because of their stimuli-responsive properties due to dynamic reversible non-covalent interactions, supramolecular polymers have attracted the increasing attention of chemists [1,2,3,4,5,6,7]
When the concentrations were higher (>50 mM), the gap between their diffusion coefficients became larger. When both of their concentrations were 100 mM, the diffusion coefficient of the linear polymer was about 20 times larger than the cross-linked one, which proves the different average sizes of their aggregates. These results clearly indicate that the supramolecular polymerization process can be controlled by the binding constant of the host–guest system and significantly by the topology of the monomer
The host–guest recognition of 4 and paraquat was investigated by UV–vis, NMR, and electrospray ionization mass (ESI-MS) spectroscopy
Summary
Because of their stimuli-responsive properties due to dynamic reversible non-covalent interactions, supramolecular polymers have attracted the increasing attention of chemists [1,2,3,4,5,6,7]. Supramolecular polymers can change topology through the introduction of dynamic non-covalent interactions such as multiple hydrogen bonding [8,9,10,11,12,13], metal coordination [14,15,16,17,18,19], host–guest interactions [20,21,22,23,24], and aromatic stacking [25,26]. By changing the central metal, it is easy to adjust the coordination number and direction of the ligands, realizing topological control of the target self-assemblies
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