Self-assembled (pseudo)rotaxane and polyrotaxane through host–guest chemistry based on the cucurbituril family

Han, Zenghui; Zhou, Qi; Li, Yaoji

doi:10.1007/s10847-018-0828-7

Cited by 15 publications

(6 citation statements)

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“…Treating the paramagnetic heterometallic {Cr 7 NiF 8 } ring complex as a qubit (i.e., quantum bit, a basic unit of quantum information for constructing a quantum computer) 242 and by using different spacers and different linking strategies, several families of twoqubit molecular structures were constructed, preserving long coherence times that can potentially be used to mediate twoqubit quantum gates. 243 Note that the similar octachromium{Cr 8 F 8 } complex was also used as building block to construct supramolecules, belonging to the class of rotaxanes 244 where {Cr 8 } cycles were spanned by organic ligands (section 2.2 and Figure 2). 37 Rotaxanes based on the organic cavitand cucurbit [6]uril (Figure 37a) were system- atically studied in the group of K. Kim (POSTECH, Republic of Korea).…”

Section: Metal Halide Clusters the Examples Of Giant Clusters With An Mmentioning

confidence: 99%

“…Note that the similar octachromium{Cr 8 F 8 } complex was also used as building block to construct supramolecules, belonging to the class of rotaxanes where {Cr 8 } cycles were spanned by organic ligands (section and Figure ). Rotaxanes based on the organic cavitand cucurbit[6]uril (Figure a) were systematically studied in the group of K. Kim (POSTECH, Republic of Korea) .…”

Section: Main Classes Of Giant Supramolecules and Clustersmentioning

confidence: 99%

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Structural Chemistry of Giant Metal Based Supramolecules

2021

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The review presents a bird-eye view on the state of research in the field of giant nonbiological discrete metal complexes and ions of nanometer size, which are structurally characterized by means of single-crystal X-ray diffraction, using the crystal structure as a common key feature. The discussion is focused on the main structural features of the metal clusters, the clusters containing compact metal oxide/hydroxide/chalcogenide core, ligand-based metal–organic cages, and supramolecules as well as on the aspects related to the packing of the molecules or ions in the crystal and the methodological aspects of the single-crystal neutron and X-ray diffraction of these compounds.

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Section: Metal Halide Clusters the Examples Of Giant Clusters With An Mmentioning

confidence: 99%

Section: Main Classes Of Giant Supramolecules and Clustersmentioning

confidence: 99%

Structural Chemistry of Giant Metal Based Supramolecules

2021

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“…As a matter of facts, the high affinity of CB[n]s (n = 7 or 8) for viologens dications and cation radicals has been extensively used over the past decades to devise a wide range of redox-or chemically-responsive rotaxane-like molecular systems [36,37]. More recently, viologen and cucurbiturils have also been considered as key building blocks in the development of various potentially responsive 2D/3D self-assembled structures [30,35,38,39], the underlying idea being that the dimensionality of the assemblies can be tuned with the number of viologens units available on each tectons.…”

Section: Introductionmentioning

confidence: 99%

Photo/redox-responsive 2D-Supramolecular assembly involving Cucurbit[8]uril and a star-shaped porphyrin tecton

Chowdhury

Nassar

Guy

et al. 2019

Electrochimica Acta

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The present paper reports on the formation and on the electrochemical/spectroscopic characterization of inclusion complexes formed in aqueous media between cucurbit[7 or 8]urils cavitands (CB[7], CB[8]) and a rigid four-pointed star-shaped viologen-appended porphyrin tecton. The formation of discrete 4:1 pseudo-rotaxane-like caviplexes, involving threading of CB[n] rings on the rigid viologen-based star's branches has been demonstrated by nuclear magnetic resonance and mass spectrometry measurements. Then, the photo-and redoxtriggered formation of 2D supramolecular assemblies involving CB[8]s and the four electron reduced tectons as key building elements, has been established on the ground of in-depth electrochemical and spectroscopic analyses supported by quantum calculations. The CB[8]promoted intermolecular -dimerization of the viologen cation radicals introduced at the meso positions of the porphyrin plateform has been brought to light through the diagnostic signatures of the 1:2 host-guest ternary caviplexes formed between viologen and CB[8] and by spectroscopic data collected after electrochemical, chemical or photochemical reduction of the viologen-based tectons. The CB[8] hosts not only proved useful to promote the redox-triggeredformation of supramolecular assemblies, it was also found to prevent the chemical reduction of the porphyrin ring in aqueous media and its subsequent conversion into phlorin products.

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“…34 In contrast CB[n]s bind strongly to cationic guests, such as those with ammonium units. 35 An interesting property of CB[6], first noticed in the early 1980s by Mock and co-workers, is that upon formation of a heteroternary assembly with azide and alkyne guests, regiospecific formation of 1,4-disubstituted-1,2,3-triazoles by confinementaccelerated 1,3-dipolar cycloaddition of the reagents is effected. 36 Through the use of bulky N-tert-butyl ammonium reagents, too large to pass through the cavity of CB[6], the same group were able to form a kinetically stable [2]rotaxane product using this CB-azide-alkyne cycloaddition (CB-AAC) reaction.…”

Section: Orthogonal Templatesmentioning

confidence: 99%