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Themed collection Form and Function of Molecular Cups and Capsules

25 items
Editorial

Form and function of molecular cups and capsules

Welcome to this CrystEngComm themed issue entitled “Form and Function of Molecular Cups and Capsules”.

Graphical abstract: Form and function of molecular cups and capsules
Highlight

Molecular cavity nanoarchitectonics for biomedical application and mechanical cavity manipulation

Based on designed constructions of cavity networks and arrays, macroscopic mechanical motions can lead to cavity manipulations for drug delivery and molecular capture. From biomedical applications to mechanical cavity manipulation, the potential and possibilities of cavity nanoarchitectonics are demonstrated in this highlight.

Graphical abstract: Molecular cavity nanoarchitectonics for biomedical application and mechanical cavity manipulation
Communication

Metal exchange study of pyrogallol[4]arene based dimers

The synthesis, the single-crystal X-ray structure, and a metal-exchange study of a zinc-seamed C-hexylpyrogallol[4]arene/PgC6Zn dimer are reported.

Graphical abstract: Metal exchange study of pyrogallol[4]arene based dimers
Open Access Communication

Host–guest complexes of cucurbit[6]uril with the trypanocide drug diminazene and its degradation product 4-aminobenzamidine

The cocrystallization between diminazene and cucurbit[6]uril succeeds only after thorough purification of the macrocycle from the acid. Otherwise, the drug molecule undergoes acid-catalyzed hydrolysis with formation of 4-aminobenzamidine.

Graphical abstract: Host–guest complexes of cucurbit[6]uril with the trypanocide drug diminazene and its degradation product 4-aminobenzamidine
Communication

Solid-state “Russian doll”-like capsules based on a triptycene-derived macrotricyclic host with paraquat derivative and polycyclic aromatic hydrocarbons

“Russian doll”-like complexes based on a triptycene-derived macrotricyclic host with paraquat derivative and polycyclic aromatic hydrocarbons in the solid state were described.

Graphical abstract: Solid-state “Russian doll”-like capsules based on a triptycene-derived macrotricyclic host with paraquat derivative and polycyclic aromatic hydrocarbons
Open Access Paper

Single-crystal-to-single-crystal transformation of the desolvation of a cyclotriveratrylene–acetonitrile inclusion complex via a gating mechanism with subsequent polymorphism

A cyclotriveratrelyne–acetonitrile inclusion complex is shown to undergo a single-crystal-to-single-crystal transformation upon desolvation to an intermediate phase and it is furthermore demonstrated that the preparation conditions may introduce polymorphism of the apohost.

Graphical abstract: Single-crystal-to-single-crystal transformation of the desolvation of a cyclotriveratrylene–acetonitrile inclusion complex via a gating mechanism with subsequent polymorphism
Paper

Ethylene-bridged asymmetric cavitands as building blocks for supramolecular polymers and capsules

A supramolecular polymer as well as a dimeric capsule, both constructed from a combination of a tetra-carboxylic acid functionalized cavitand and a suitable N-heterocyclic ‘linker’, have been crystallographically characterized.

Graphical abstract: Ethylene-bridged asymmetric cavitands as building blocks for supramolecular polymers and capsules
Paper

Solid-state assembly of a resorcin[6]arene in twin molecular capsules

In the solid state, a larger resorcin[6]arene self-assembles in twin capsules able to host solvent molecules.

Graphical abstract: Solid-state assembly of a resorcin[6]arene in twin molecular capsules
Paper

Interaction of a symmetrical α,α′,δ,δ′-tetramethyl-cucurbit[6]uril with Ln3+: potential applications for isolation of lanthanides

Interaction of a symmetrical α,α′,δ,δ′-tetramethyl-cucurbit[6]uril (TMeQ[6]) with a series of lanthanide cations (Ln3+) was investigated in neutral water and acidic solution.

Graphical abstract: Interaction of a symmetrical α,α′,δ,δ′-tetramethyl-cucurbit[6]uril with Ln3+: potential applications for isolation of lanthanides
Paper

Influence of the cavity dimension on encapsulation of halides within the capsular assembly and side-cleft recognition of a sulfate–water cluster assisted by polyammonium tripodal receptors

Anion induced capsular and non-capsular assembly of polyammonium tripodal receptors into supramolecular network and formation of side-cleft recognition of a sulfate–water cluster are reported.

Graphical abstract: Influence of the cavity dimension on encapsulation of halides within the capsular assembly and side-cleft recognition of a sulfate–water cluster assisted by polyammonium tripodal receptors
Paper

Synthesis and recognition properties of calix[4]arene semitubes as ditopic hosts for N-alkylpyridinium ion pairs

Three novel calix[4]arene semitubes having two alkyl bridging spacers of different lengths were synthesized and used as homoditopic hosts for small neutral acidic molecules and N-alkylpyridinium salts.

Graphical abstract: Synthesis and recognition properties of calix[4]arene semitubes as ditopic hosts for N-alkylpyridinium ion pairs
Paper

[CrIII8MII6]n+ (MII = Cu, Co) face-centred, metallosupramolecular cubes

Heterometallic cubes, assembled in a modular fashion from a [CrL3] metalloligand and simple MII salts, display interesting encapsulation and magnetic behaviours.

Graphical abstract: [CrIII8MII6]n+ (MII = Cu, Co) face-centred, metallosupramolecular cubes
Paper

Encapsulation of biogenic polyamines by carboxylcalix[5]arenes: when solid-state design beats recognition in solution

The regioselective host-to-guest proton transfer readily triggers the formation of overall-neutral supramolecular capsules.

Graphical abstract: Encapsulation of biogenic polyamines by carboxylcalix[5]arenes: when solid-state design beats recognition in solution
Paper

Cationic M2L4 cages for perchlorate removal from aqueous solutions and preferential perchlorate incorporation in hydrophilic solutions

Four new cationic cage type compounds have been synthesized and characterized. Their compounds successfully removed perchlorate ions from aqueous solutions. The solvent dependent anion inclusion of the cationic cage is described.

Graphical abstract: Cationic M2L4 cages for perchlorate removal from aqueous solutions and preferential perchlorate incorporation in hydrophilic solutions
Paper

Coordination of alkaline-earth metal cations to a symmetrical octamethyl-substituted cucurbituril in the presence of polychlorido cadmium(II) anions

Selected alkaline earth ions interact with a symmetric octamethyl-cucurbituril in the presence of polychlorido cadmium(II) anions to yield new porous coordination polymers that reversibly adsorb common volatile liquid vapours.

Graphical abstract: Coordination of alkaline-earth metal cations to a symmetrical octamethyl-substituted cucurbituril in the presence of polychlorido cadmium(ii) anions
Paper

Unexpected narcissistic self-sorting at molecular and supramolecular levels in racemic chiral calixsalens

Non-covalent interactions drive enantioselective self-recognition in racemic calixsalens.

Graphical abstract: Unexpected narcissistic self-sorting at molecular and supramolecular levels in racemic chiral calixsalens
Paper

Synthesis, structures and cytotoxicity studies of p-sulfonatocalix[4]arene lanthanide complexes

A series of lanthanide (Tb, Gd and Eu) based p-sulfonatocalix[4]arene have been synthesized, and screened for their anti-proliferation activity; all complexes exhibited low CC50 values.

Graphical abstract: Synthesis, structures and cytotoxicity studies of p-sulfonatocalix[4]arene lanthanide complexes
Paper

Syntheses, structures, luminescence and magnetic properties of three high-nuclearity neodymium compounds based on mixed sulfonylcalix[4]arene-phosphonate ligands

The solvothermal reactions of p-tert-butylsulfonylcalix[4]arene (H4BSC4A), phosphonic acid and neodymium chloride have resulted in three novel high-nuclearity neodymium coordination compounds.

Graphical abstract: Syntheses, structures, luminescence and magnetic properties of three high-nuclearity neodymium compounds based on mixed sulfonylcalix[4]arene-phosphonate ligands
Paper

Shaping of calix[4]arenes via double bridging of the upper rim

Direct meta-dimercuration can be used for subsequent bridging of a calix[4]arene skeleton to form an unprecedented, rigid and highly distorted cavity.

Graphical abstract: Shaping of calix[4]arenes via double bridging of the upper rim
Paper

Diphosphonate cavitands as molecular cups for L-lactic acid

Two isomeric diphosphonate cavitands (ABii and ACii) were probed for the molecular recognition of L-lactic acid in solution via NMR spectroscopy and in the solid state via crystal structure determination. The interactions involved in the recognition event are a combination of hydrogen bonding and CH–π interactions.

Graphical abstract: Diphosphonate cavitands as molecular cups for l-lactic acid
Open Access Paper

Conformational changes in Cmethyl-resorcinarene pyridine N-oxide inclusion complexes in the solid state

4-Substituted pyridine N-oxides due to cavity misfit form a C2v boat conformer and give 1-D tubular chains, while 2- and 3-methylpyridine N-oxides give in-cavity complexes with a C4v crown conformation.

Graphical abstract: Conformational changes in Cmethyl-resorcinarene pyridine N-oxide inclusion complexes in the solid state
Paper

Anticancer activity of large metalla-assemblies built from half-sandwich complexes

A series of octanuclear p-cymene ruthenium and pentamethylcyclopentadienyl rhodium and iridium metalla-assemblies has been prepared from tetrapyridyl porphyrin panels. All assemblies possess IC50 values around 0.1 μM, and induce apoptosis in cancer cells.

Graphical abstract: Anticancer activity of large metalla-assemblies built from half-sandwich complexes
Paper

Inverted molecular cups: 1-D and 2-D Ag(I) coordination polymers from resorcinarene bis-thiacrowns

Exo-cavity binding into resorcinarene based inverted molecular cups creates 1-D and 2-D silver coordination polymers with argentophilic interactions.

Graphical abstract: Inverted molecular cups: 1-D and 2-D Ag(i) coordination polymers from resorcinarene bis-thiacrowns
Paper

pH-dependent formation of different coordination cages based on Co4-TC4A secondary building units and bridging ligands

Two kinds of calixarene-based metal–organic coordination cages, a tetrahedral one and a truncated octahedral one, were obtained with the same precursors at different pH values.

Graphical abstract: pH-dependent formation of different coordination cages based on Co4-TC4A secondary building units and bridging ligands
Paper

Gadolinium(III)-mediated multi-component confinement of imidazolium cations in p-sulfonated calix[4]arene

Multi-component materials having supermolecules made up of mono- or bis-imidazolium cations shrouded by two p-sulfonated calix[4]arenes essentially form molecular capsules as part of the extended structure, with their formation mediated by Gd(III), which is incorporated only in complex I.

Graphical abstract: Gadolinium(iii)-mediated multi-component confinement of imidazolium cations in p-sulfonated calix[4]arene
25 items

About this collection

The issue will focus on the design, assembly, crystalline structure and properties of supramolecular compounds made from building blocks such as calixarenes, cucurbiturils, cyclodextrins, cryptands and other encapsulating species.

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