The covalent attachment of electron deficient perfluoroaryl substituents to a bis-iodotriazole pyridinium group produces remarkably potent halogen bonding donor motif for anion recognition in aqueous media. Such also establishes templation as highly efficient method constructing mechanically interlocked molecule unprecedented near quantitative yield. resulting bis-perfluoroaryl substituted iodotriazole axle containing [2]rotaxane host exhibits exceptionally strong halide binding affinities...

Abstract A series of heteroditopic receptors containing halogen bond (XB) and unprecedented chalcogen (ChB) donors integrated into a 3,5‐bis‐triazole pyridine structure covalently linked to benzo‐15‐crown‐5 ether motifs exhibit remarkable cooperative recognition halide anions. Multi‐nuclear 1 H, 13 C, 125 Te 19 F NMR, ion pair binding investigations reveal sodium cation–benzo‐crown dramatically enhances the bromide iodide anions, with bonding receptor notably displaying largest enhancement...

The design and construction of neutral interlocked host molecules for anion recognition are rare. Using an active-metal template approach, the preparation a family halogen bonding (XB) rotaxanes containing two, three four iodotriazole groups integrated into macrocycle axle components is achieved. In spite hosts' neutrality, such rotaxane systems capable binding halide anions strongly selectively in wet organic solvent mixtures. Importantly, halide-binding strength selectivity can be...

Described herein is a facile electrochemical strategy for the generation of formaldehyde from N,N-dimethylacetamide (DMA) and water (H2O) toward direct site-selective N-hydroxymethylation indoles derivatives. Mechanistic studies suggested that N-(hydroxymethyl)-N-methylacetamide generated in situ DMA/H2O under conditions serves as surrogate. The developed methodology features mild, base- metal catalyst-free conditions. reaction can accommodate broad range substrate scopes offers an...

Pyridine bis(carboxamide)-strapped pillar[5]arene capsules were synthesized with the serendipitous formation of macrotricyclic products. The structural integrity supramolecular capsules, determined by specific orientation a single nitrogen atom, controls electronic properties confined binding cavity, facilitating length-selective recognition aliphatic organic guests nitrile, isocyanide, and amine functional groups exceptional host–guest affinity selectivity for 1,2-diaminoethane (Ka > 104...

This study presents an appealing approach to sustainable catalysis using cellulose filter paper as a support for copper-catalyzed reactions. The was functionalized with thiol groups through reaction thioglycolic acid, which served dual purpose: partially reducing Cu(II) Cu(I) and stabilizing active copper species via Cu–S interactions. Spectroscopic analysis confirmed the formation of highly dispersed multi-valent Cu2O/CuO on thiol-functionalized cellulose, resulting in efficient catalyst....

A simple and rapid functionalization of MOF <italic>via</italic> microwave-assisted one-pot synthesis afforded a Cu(<sc>ii</sc>)-Schiff-base-MOF as an efficient catalyst for olefin oxidation.

Fluorescent polymer nanocomposites of silsesquioxane cage-based anthracene (An-PSQ) and pyrene (Py-PSQ) were obtained by cross-linked polymerization octavinylsilsesquioxane (OVS) with 9,10-dibromoanthracene or 1,6-dibromopyrene, respectively. The fluorescent polymers are insoluble structurally characterized FT-IR NMR. Polyaromatic spacer groups incorporated into materials could tune rigidify in both micro- mesoporous structures high surface area comparison to silica-based the range 246–342...

Abstract A series of chalcogen, halogen and hydrogen bonding heteroditopic macrobicyclic cryptands are reported their potassium halide ion‐pair recognition properties investigated. Saliently, the co‐bound cation was determined to be crucial in switching on bromide iodide respective cryptand receptor. Importantly, nature sigma‐hole mediated interaction employed anion component is demonstrated significantly augment binding behaviour, markedly so for analogue. Most notably incorporation a...

Intermolecular interactions between an electron-rich aromatic hydroquinone (HQ) with its electron deficient counterpart, benzoquinone (BQ), result in the formation of a quinhydrone charge-transfer complex. Herein, we report novel quinhydrone-type complex pillar[5]quinone (P[5]Q) and HQ. Characterized by suite spectroscopic techniques including 1H NMR, UV-visible, FTIR together PXRD, SEM, BET, CV, DFT modeling studies, stability is determined to be due electron-proton transfer reaction...

Pillararene cross-linked gelatin hydrogels were designed and synthesized to control the uptake release of antibiotics using light. A suite characterization techniques ranging from spectroscopy (FT-IR, 1H 13C NMR, MAS NMR), X-ray crystallographic analysis, scanning electron microscopy (SEM), thermogravimetric analysis (TGA) was employed investigate physicochemical properties hydrogels. The azobenzene-modified sulfamethoxazole (Azo-SMX) antibiotic noncovalently incorporated into hydrogel via...

Abstract The covalent attachment of electron deficient perfluoroaryl substituents to a bis‐iodotriazole pyridinium group produces remarkably potent halogen bonding donor motif for anion recognition in aqueous media. Such also establishes templation as highly efficient method constructing mechanically interlocked molecule unprecedented near quantitative yield. resulting bis‐perfluoroaryl substituted iodotriazole axle containing [2]rotaxane host exhibits exceptionally strong halide binding...

Unprecedented pillar[5]arene-isocyanide pseudorotaxane complexes are reported. Extensive 1H-NMR experiments reveal remarkably strong binding affinities of alkyl diisocyanide guests (Ka > 105 M-1 in CDCl3) by pillar[5]arenes. Characterised multinuclear 1H and 13C-NMR spectroscopy single-crystal X-ray diffraction, it is demonstrated that pillar[5]arenes capable encapsulating a series diisocyanides wherein either [2]- or [3]pseudorotaxanes can be formed varying the chain length. Moreover,...

A nonprecious metal and biopolymer-based catalyst, Cu/chitosan beads, has been successfully prepared by using a software-controlled flow system. Uniform, spherical beads can be obtained with diameters in millimeter-scale narrow size distribution (0.78 ± 0.04 mm). The morphology of the are reproducible due to high precision rate. In addition, application as green reusable catalyst demonstrated convenient efficient protocol for direct synthesis imines via oxidative self- cross-coupling amines...

Abstract A series of heteroditopic receptors containing halogen bond (XB) and unprecedented chalcogen (ChB) donors integrated into a 3,5‐bis‐triazole pyridine structure covalently linked to benzo‐15‐crown‐5 ether motifs exhibit remarkable cooperative recognition halide anions. Multi‐nuclear 1 H, 13 C, 125 Te 19 F NMR, ion pair binding investigations reveal sodium cation–benzo‐crown dramatically enhances the bromide iodide anions, with bonding receptor notably displaying largest enhancement...

Nucleophilic substitution of pertosylated pillar[5]arene (P-OTs) with commercially available sulfur containing nucleophiles (KSCN, KSAc, and thiophenol), yields a series sulfur-functionalised pillar[5]arenes. DLS results SEM images imply that these pillararene macrocycles self-assemble in acetonitrile solution, while X-ray crystallographic evidence suggests solvent-dependent assembly the solid state. The nature substituents decorating rim controls binding affinities towards organic guest...

A facile synthesis of decatosylate pillar[5]arene is reported in excellent yield (&gt;70%). The pendant tosylate arms function as an effective template the and supramolecular polymer formation.

Microwave irradiation is exploited for the facile, one‐step functionalization of Cu(acac) 2 to –NH pendant groups MIL‐53(Al)‐NH , a metal–organic framework material, under mild reaction conditions and short time. PXRD, XPS, XAS, EPR spectroscopy are used investigate structure chemical nature copper species on framework. The center exists in +2 oxidation state with square‐planar geometry NO 3 coordination environment. complex anchored by imine bond formation. This copper‐functionalized or...

The synthesis and post-synthetic modification of a novel tosylate-functionalized hyper-crosslinked polymer (HCP) for the purpose water remediation are reported.

A series of neutral tetradentate halogen bonding (XB) macrocycles, comprising two bis-iodotriazole XB donors were synthesised in 60-70% yields via a stepwise CuAAC-mediated cyclisation strategy. Extensive 1H NMR anion titration experiments reveal halide binding affinities are critically dependent on the substitution pattern xylyl spacer unit. The meta-substituted macrocycle remarkably displays cooperative XB-halide recognition highly competitive 40% aqueous-organic D2O/acetone-d6 (40 : 60,...

A new bis-triazacyclononane tris-pyridyl N9 -azacryptand ligand is prepared via a convenient one-pot [2+3] condensation reaction between triazacyclononane and 2,6-bis(bromomethyl) pyridine in the presence of M2 CO3 (M=Li, Na, K). The proton, lithium, sodium, potassium lead(II) complexes are characterised solid state. Preliminary solution-phase competition experiments indicate that cryptand preferentially binds calcium, zinc cations methanol solution.