Supramolecular inclusion-based molecular integral rigidity: a feasible strategy for controlling the structural connectivity of uranyl polyrotaxane networks

Abstract

The assembly of two-dimensional (2D) large channel uranyl-organic polyrotaxane networks as well as structural regulation of uranyl-bearing units using jointed cucurbit[6]uril-based pseudorotaxanes with integral rigidity based on supramolecular inclusion is presented for the first time. This construction strategy concerning controlling molecular integral rigidity based on supramolecular inclusion may afford an entirely new methodology for coordination chemistry.

An Unprecedented Two‐Fold Nested Super‐Polyrotaxane: Sulfate‐Directed Hierarchical Polythreading Assembly of Uranyl Polyrotaxane Moieties

“…The pseudorotaxane ligand L 1 was synthesized by the preassembly of C4CN4 with CB[6] according to the procedure reported previously . The corresponding X‐ray quality crystal of L 1 (Figure S1 and Table S1 in the Supporting Information) reveals that the macrocyclic CB[6] is threaded by the C4‐chain of the protonated C4CN4, which is consistent to the structural information from mass spectrometry (doubly charged ionic peak of m / z 658.21) and the NMR spectrum (characteristic upfield displacement of the proton signals, see Figures S2 and S3 in the Supporting Information).…”

“…The in‐situ formation of the 4‐aminomethyl benzoate group might be achieved through the thermal decomposition of its relatively heat‐labile organic ammonium salt precursor, that is, C4A4, which has a dynamic balance with C4A4@CB6 under hydrothermal condition. This coordination pattern leads to a four‐connected uranyl SBU and further extends into a 2D network with a prismatic loop as its minimum repeating unit (two internal side lengths of 23.26(1) and 28.94(1) Å and an apical angle of 53.4(1)° (Figure ), which is similar to the 2D polyrotaxane structures reported by us previously . These layers of 2D networks are close‐packed in the crystal with an interlayer spacing of approximately 7.10 Å, which is narrower than that of the polythreading framework in compound 1 .…”

Exploring New Assembly Modes of Uranyl Terephthalate: Templated Syntheses and Structural Regulation of a Series of Rare 2D → 3D Polycatenated Frameworks

“…The inactive terminal oxo groups of uranyl often prevent axial bonding interactions, resulting in any further coordination occurring in the equatorial plane. As a result, uranyl-organic coordination polymers usually prefer to form onedimensional (1D) chains, 10,[15][16][17] or two-dimensional (2D) sheets, [18][19][20][21][22][23][24] rather than threedimensional (3D) frameworks that require structural connectivity in the third axial dimension. [25][26][27][28][29][30][31][32] 2D networks or 3D frameworks with large cavities or pores can readily achieve a high degree of self-assembly by an entangled mode in the solid state, and thus afford a variety of intriguing topological structures as well as fascinating properties.…”

Multilayer Cucurbit[6]uril‐Based Magnetic Nanoparticles Prepared by Host–Guest Interaction: Remarkable Adsorbent for Low Density Lipoprotein Removal from Plasma

“…[11] Due to this unique characteristics, CB [6] attractse xtensive attention for its potential applications in molecular catalysis, molecular recognition,a nd supra-molecular self-assembling. [12][13][14] It has high binding affinity with various guests including metali on, polyelectrolyte, and polyamine. [15] For instance, diaminohexane (DAH), an organic polyamine, can combine with CB [6] to form a1 :1 host-guest complex with ab inding constantr eaching 10 10 or 10 12 m À1 .…”

“…CB[6] is an efficient host molecule in molecular recognition with its hydrophobic cavity and carbonyl groups at the portal . Due to this unique characteristics, CB[6] attracts extensive attention for its potential applications in molecular catalysis, molecular recognition, and supra‐molecular self‐assembling . It has high binding affinity with various guests including metal ion, polyelectrolyte, and polyamine .…”