Four barrel-shaped artificial molecular capsules based on cucurbit[5]uril, [K4(C30H30N20O10)2(HCONH2)2(H2O)2Cl2]Cl2·CH3OH·17.5H2O (1), {[Ba2(C30H30N20O10)Cl](NO3)(H2O)5}Cl2·2H2O (2), [Cd(C30H30N20O10)Cl2](H3O)22+CdCl42-·2CH3OH2·4H2O (3), and {[La(C30H30N20O10)Cl]LaCl(H2O)9}Cl4·HCl·7H2O (4) were synthesized structurally characterized by single-crystal X-ray diffractions. The crystal structure of these compounds show that chlorine anions encapsulated in cucurbit[5]uril to form open or closed...

The selective encapsulation behavior of cucurbit [5]uril and its lanthanide-capped molecular capsule toward nitrate chloride ions has been investigated. Using fluorescence spectroscopy, the metal-free host demonstrated to selectively include ion. In contrast, showed preference inclusion Solid-state structures complexes with La(III)-capped have crystallographically determined.

These things are sent to tri us: The introduction of CF3 units into organic molecules is important and requires the development convenient trifluoromethylating reagents. Here, PhI+CF3, an acyclic electrophilic "CF3+" species, described, including its in situ generation from TMSCF3, PhI(OAc)2, KF direct applications sp2 CH trifluoromethylations under mild transition-metal-free conditions (see scheme). As a service our authors readers, this journal provides supporting information supplied by...

Analytical technologies that enable investigations at the single cell level facilitate a range of studies; here lab-fabricated capillary electrophoresis-electrospray ionization-mass spectrometry (CE-ESI-MS) platform was used to analyze anionic metabolites from individual Aplysia californica neurons. The system employs customized coaxial sheath-flow nanospray interface connected separation capillary, with sheath liquid and buffer optimized ensure stable spray. method provided good...

According to a simple guest-replacement fluorescence turn-on mechanism, we constructed fluorescent probe system based on cucurbit[10]uril (Q[10]) and protonated acridine (AD) detect the pesticide dodine (DD). Formation of homoternary inclusion complex AD2@Q[10] in both aqueous solution solid state was studied by means 1H NMR spectroscopy X-ray crystallography. Although AD can emit strong solution, does not exhibit any fluorescence. Upon addition DD into AD2@Q[10], molecules Q[10] cavity are...

Much effort has been devoted to the development of supramolecular hydrogels due their broad applications and conveniently controllable properties. Here, we demonstrate a novel host-guest hydrogel, which is constructed by host γ-CD complexed with guest 1-(4-carboxybenzyl)-4,4'-bipyridinium chloride (1+·Cl-) through π···π interaction, hydrogen bonding, interactions. The hydrogel [1+@γ-CD]n exhibits reversible electron transfer photochromic behavior photomodulable fluorescence. excellent...

Abstract Multistimuli‐responsive color‐changing materials have potential applications in areas such as chemical sensing and anti‐counterfeiting. In this work, a fluoro‐phenyl‐acetyl‐substituted viologen derivative (FPAV·Cl 2 ) is synthesized, which can form supramolecular inclusion complex with cucurbit[7]uril (Q[7]) via self‐assembly. Significantly, the resulting FPAV 2+ @Q[7] solid‐state exhibits visual color changes response to multiple external stimuli including light, heat, vapors of...

Multi-stimuli-responsive chromic materials have immense potential for utilization. Herein, two supramolecular inclusion complexes were prepared by self-assembly of β-cyclodextrin (β-CD) with dialkylcarboxyl-substituted viologens,

Q[8]-based honeycomb-like frameworks can be obtained in [AuCl4]--free aqueous HNO3 solution and HCl solutions that contain [AuCl4]-. The outer surface interaction of Q[8] with planar inorganic anions [AuCl4]- NO3- is the main driving force. These exhibit a high selectivity for imprisoning could establish process gold recovery.

This review covers important advances in the field of substituted cucurbit[<italic>n</italic>]urils.

A series of complexes based on the macrocyclic ligand cucurbit[7]uril (Q[7]) with formulas {La2(H2O)12Q[7]}·2(ZnCl4)·2Cl·31H2O (1), {Ln2(H2O)12Q[7]}·2(ZnCl4)·2Cl·xH2O [isomorphous Ln = Ce (2), Pr (3) and Nd (4), x 25 29 (4)], {Ln2(H2O)10Q[7]}·2(ZnCl4)·2Cl·xH2O Sm (5), Gd (6), Tb (7), Er (8), Tm (9), Yb (10) Lu (11), 24 27 33 18 (11)], have been synthesized by self-assembly Q[7] corresponding lanthanide species in presence ZnCl2. The single-crystal X-ray diffraction analyses reveal that...

Environmentally benign methods for gold recovery and detection are highly desirable a sustainable future. Herein, we demonstrate selective strategy of with cucurbit[n]urils (Q[n = 5-7]) by means outer-surface interactions. Tetrachloroaurate anion ([AuCl4]-) is able to be rapidly precipitated Q[n] in forms supramolecular adducts. X-ray crystallography four Q[n 5-7]·[AuCl4]- complexes reveal that strong interactions between 5-7] [AuCl4]- the major driving force formation complexes....

Using the achiral N,N'-bis(2-pyridylmethyl)-1,6-hexanediamine ligand bearing two end pyridyl groups as source of conformational chirality, a novel type TMeQ[6]-based helical polyrotaxane was prepared and characterized by X-ray crystallography (1)H NMR spectroscopy. The chirality generated from twisting hexylidene "string" when bound within hydrophobic cavity TMeQ[6]. Two opposite chiral polyrotaxanes crystallize racemic compound.

Compared to a linear 1D coordination polymer of cucurbit[5] uril with Dy3+ ion, pair homochiral 1D-helical polymers were obtained by spontaneous resolution upon crystallization in the presence achiral hydroquinone, suggesting hydroquinone acts as an inducer chiral helix.

The reaction of cucurbit[6]uril with Cu(NO3)2 and CuCl2, respectively, generates a 1D zigzag chain {[Cu(H2O)4(cucurbit[6]uril)]·(NO3)2·(H2O)8}n tubular structure {[Cu(H2O)2(Cl)2(cucurbit[6]uril)]1/3·(H2O)3}n, showing clearly how to control the reversible mutual interconnections between ligand metal ion under guide coordination chemistry.

This study shows that the twisted cucurbit[14]uril features two different cavities, which can encapsulate or even three guest molecules with suitable shape and size, forming a special inclusion complex.

Binding interactions between symmetrical α,α',δ,δ'-tetramethylcucurbit[6]uril (TMeQ[6]) and a series of alkyldiammonium ions in aqueous solution the solid state were investigated by (1)H NMR spectroscopy, MALDI-TOF mass spectrometry, X-ray crystallography, isothermal titration calorimetry (ITC). Their spectra reveal that actual binding behaviors vary depending upon alkyl chain length. single-crystal diffraction analyses indicate guest 1,2-ethanediammonium is located outside TMeQ[6] portal,...

Complexation of cyclohexanocucurbit[6]uril (Q*[6]), a water-soluble cucurbit[n]uril derivative, with Cd2+ ions has been studied by means cyclic voltammetry and differential pulse voltammetry. The electrochemical experimental data prove the formation highly stable 1:6 Q*[6]/Cd2+ complex. We also obtained single-crystal X-ray structure cadmium ion complex Q*[6], in which each portal Q*[6] chelates three ions. present study suggests potential utility as an effective chelator extractant.