Supramolecular Ladders from Dimeric Cucurbit[6]uril

Wittenberg, James B.; Zavalij, Peter Y.; Isaacs, Lyle

doi:10.1002/ange.201300404

Cited by 10 publications

(3 citation statements)

References 47 publications

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“…31 Compound 40 (3 equiv) undergoes self-assembly with oligomer 41 (2 equiv) to yield supramolecular ladder 40 3 · 41 2 as shown in Scheme 8 as established by 1 H NMR symmetry considerations and diffusion coefficient measurements (DOSY). Complex 40 3 · 41 2 is comparable in weight (7389 amu) and dimension (40 × 29 × 11 Å 3 ) to small proteins.…”

Section: Self-sorting and Stimuli Responsive Systems Based On Cb[n]-tmentioning

confidence: 99%

“…Recently, we reported the preparation of CB[6] dimer 40 by the reaction of glycoluril hexamer with 1,2,4,5-tetraformylbenzene . Compound 40 (3 equiv) undergoes self-assembly with oligomer 41 (2 equiv) to yield supramolecular ladder 40 3 · 41 2 as shown in Scheme as established by 1 H NMR symmetry considerations and diffusion coefficient measurements (DOSY).…”

Section: Self-sorting and Stimuli Responsive Systems Based On Cb[n]-t...mentioning

confidence: 99%

“…Recently, we reported the preparation of CB [6] dimer 40 by the reaction of glycoluril hexamer with 1,2,4,5-tetraformylbenzene. 31…”

Section: Controlled Folding Processesmentioning

confidence: 99%

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Stimuli Responsive Systems Constructed Using Cucurbit[n]uril-Type Molecular Containers

2014

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ConspectusThis Account focuses on stimuli responsive systems that function in aqueous solution using examples drawn from the work of the Isaacs group using cucurbit[n]uril (CB[n]) molecular containers as key recognition elements. Our entry into the area of stimuli responsive systems began with the preparation of glycoluril derived molecular clips that efficiently distinguish between self and nonself by H-bonds and π–π interactions even within complex mixtures and therefore undergo self-sorting. We concluded that the selectivity of a wide variety of H-bonded supramolecular assemblies was higher than previously appreciated and that self-sorting is not exceptional behavior. This lead us to examine self-sorting within the context of CB[n] host–guest chemistry in water.We discovered that CB[n] homologues (CB[7] and CB[8]) display remarkably high binding affinity (Ka up to 1017 M–1) and selectivity (ΔΔG) toward their guests, which renders CB[n]s prime components for the construction of stimuli responsive host–guest systems. The CB[7]·adamantaneammonium ion complex, which is particularly privileged (Ka = 4.2 × 1012 M–1), was introduced by us as a stimulus to trigger constitutional changes in multicomponent self-sorting systems. For example, we describe how the free energy associated with the formation of host–guest complexes of CB[n]-type receptors can drive conformational changes of included guests like triazene–arylene foldamers and cationic calix[4]arenes, as well as induced conformational changes (e.g., ammonium guest size dependent homotropic allostery, metal ion triggered folding, and heterochiral dimerization) of the hosts themselves.Many guests display large pKa shifts within their CB[n]–guest complexes, which we used to promote pH controlled guest swapping and thermal trans-to-cis isomerization of azobenzene derivatives. We also used the high affinity and selectivity of CB[7] toward its guests to outcompete an enzyme (bovine carbonic anhydrase) for a two-faced inhibitor, which allowed stimuli responsive regulation of enzymatic activity. These results prompted us to examine the use of CB[n]-type receptors in both in vitro and in vivo biological systems. We demonstrated that adamantaneammonium ion can be used to intracellularly sequester CB[7] from gold nanoparticles passivated with hexanediammonium ion·CB[7] complexes and thereby trigger cytotoxicity. CB[7] derivatives bearing a biotin targeting group enhance the cytotoxicity of encapsulated oxaliplatin toward L1210FR cells. Finally, acyclic CB[n]-type receptors function as solubilizing excipients for insoluble drugs for drug delivery purposes and as a broad spectrum reversal agent for the neuromuscular blocking agents rocuronium, vecuronium, and cis-atracurium in rats. The work highlights the great potential for integration of CB[n]-type receptors with biological systems.

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Section: Self-sorting and Stimuli Responsive Systems Based On Cb[n]-tmentioning

confidence: 99%

Section: Self-sorting and Stimuli Responsive Systems Based On Cb[n]-t...mentioning

confidence: 99%

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Stimuli Responsive Systems Constructed Using Cucurbit[n]uril-Type Molecular Containers

2014

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Cucurbit[7]uril Containers for Targeted Delivery of Oxaliplatin to Cancer Cells

et al. 2013

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Formation of Discrete Ladders and a Macroporous Xerogel Film by the Zipperlike Dimerization of Meso–Meso‐Linked Zinc(II) Porphyrin Arrays with Di(pyrid‐3‐yl)acetylene

et al. 2015

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Metal porphyrins assemble to form asupramolecular architecture with ac haracteristic structure and characteristic properties and functions upon complexation with appropriate ligands.However,there are few applications of these assembly processes to the construction of polymeric porphyrin arrays with useful functionalities.I nt his study,w ef ound that mesomeso-linked Zn II porphyrin arrays underwent zipperlike dimerization upon complexation with di(pyrid-3-yl)acetylene (DPA) in chloroform to form discrete double-stranded porphyrin ladders.S imilarly,t he assembly of poly(zinc(II) porphyrinylene) with DPAg ave at hermoresponsive gel, whose three-dimensional network structure was so strong that amacroporous xerogel film was obtained.

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Supramolecular Ladders from Dimeric Cucurbit[6]uril

Cited by 10 publications

References 47 publications

Stimuli Responsive Systems Constructed Using Cucurbit[n]uril-Type Molecular Containers

Stimuli Responsive Systems Constructed Using Cucurbit[n]uril-Type Molecular Containers

Cucurbit[7]uril Containers for Targeted Delivery of Oxaliplatin to Cancer Cells

Formation of Discrete Ladders and a Macroporous Xerogel Film by the Zipperlike Dimerization of Meso–Meso‐Linked Zinc(II) Porphyrin Arrays with Di(pyrid‐3‐yl)acetylene

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