Cryptand-like anion receptors

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August undefined, 2024

WebPerchlorate anion is a highly toxic environmental contaminant, which is implicated in various health related problems. This paper reports a cryptand-based synthetic molecule (L) prepared from the reaction of tris (2-aminoethyl) amine and 2,5-thiophenedicarboxaldehyde under a high dilution condition, providing a well-defined cavity for a guest species. WebComplexation of dihydrogen phosphate by novel thiourea and urea receptors in acetonitrile and dimethyl sulfoxide was studied in detail by an integrated approach by using several methods (isothermal titration calorimetry, ESI-MS, and (1)H NMR and UV spectroscopy). Thermodynamic investigations into H2PO4(-) dimerisation, which is a process that has …

Thermodynamic study of dihydrogen phosphate dimerisation and ...

WebDec 20, 2024 · receptors for targeted anions with improved selectivity and binding strength. In this regard, the aforementioned CH and NH based cryptand cages[8,11] are … WebSep 6, 2010 · About the same time the term cryptand appeared in reference to another bicyclic compound that was selective for alkaline-earth ions. Since the first report these … simplify energy storage

Cryptand-like anion receptors - PubAg

WebMay 2, 2024 · Considered in concert, these molecular constructs have allowed advances in applied supramolecular chemistry; to date, they have been exploited for selective guest encapsulation studies, anion... WebJun 23, 2024 · One topical area of supramolecular chemistry is the binding of anionic species but despite the importance of anions in diverse cellular processes and for … WebJan 27, 2012 · Generation of soluble sources of peroxide dianion (O 2 2–) is a challenge in dioxygen chemistry.The oxidizing nature of this anion renders its stabilization in organic media difficult. This Report describes the chemically reversible reduction of oxygen (O 2) to cryptand-encapsulated O 2 2–.The dianion is stabilized by strong hydrogen bonds to N … raymond twitty of milwaukee wi

Anion Binding in Water Drives Structural Adaptation in an

New Polyamide Cryptand for Anion Binding - 百度学术

WebAnion-Trap Additives The design and synthesis of receptor molecules for the selective complexation of ions has been an active area for more than two decades. In the past, … WebReceptors Abstract A tosylated azacryptand readily protonates at the bridgehead amines, becoming a potential ditopic anion receptor. The in-in conformation of the amines facilitates encapsulation of two bromide guests and represents the first structural evidence that a proton cage cryptate can bind two anions internally. * raymond twinhorseWebThese unique host molecules are easily accessible from the corresponding semithio-bambusurils in a one-pot reaction, which converts a single anion receptor into a potential anion channel. Solid-state structures exhibit simultaneous accommodation of three anions, linearly positioned within the cavity along the main symmetry axis. raymond two hawks

"WebAbout the same time the term cryptand appeared in reference to another bicyclic compound that was selective for alkaline-earth ions. Since the first report these simple bicycles, a vast arena of hosts has appeared, including acyclic, monocyclic, and other multicyclic … " - Cryptand-like anion receptors

Cryptand-like anion receptors

WebDec 20, 2024 · The concept of anion receptor can date back to the late 1960s,1and has become one revolutionary branch of supramolecular chemistry, with rich applications ranging from chemistry, biology to industry separations during the past decade.2Of particular importance and interests are the development of novel adsorbents which can selectively … WebCryptands utilize inside CH or NH groups as hydrogen bond (H-bond) donors to capture anions such as halides. In this work, the nature and selectivity of confined hydrogen …

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WebMay 23, 2024 · This design principle has been used in NH hydrogen-bonding anion receptors including Lehn’s cationic aza-cryptands , Sessler’s neutral pyrrolo … WebThe novel cryptand in/out-3, containing two tripyrrolemethane units bridged by three 1,3- diisopropylidenbenzene arms, was readily synthesized by a convergent three-step …

WebOct 1, 2010 · Cryptands and aza-cryptands have been well-established to work as versatile anionic receptors for negatively charged guest species, inter alia, in their protonated … WebThe impact of the solvent environment on the stabilization of the complexes formed by fluorine (T-F) and cyanide (T-CN) substituted tweezers with halide anions has been investigated theoretically. The study was carried out using computational methodologies based on density functional theory (DFT) and symmetry adapted perturbation theory …

WebAn anion receptor derived from a tren-based amide cryptand with pyridine spacers has been synthesized and characterized. Two crystal structures are reported: the hydrochloride salt and the fluoride complex. The cryptand shows extremely high binding with fluoride ion in DMSO-d6. Both the crystal structure and solution 19F NMR data indicate an ... WebAug 1, 2024 · Both the inner voids (cavity and cleft) are accessible to various guests such as metal ions, anions and, neutral molecules. The pyrrole ring offers hydrogen bond donor NH groups and its...

WebAug 20, 2024 · Cryptand 1 was obtained by an acetylenic coupling reaction and, despite our expectation to have a shape-persistent compound with a large internal cavity, the single crystal X-ray diffraction molecular structure of cryptand 1 showed the completely collapsed cavity behavior of the cryptand [ 17 ].

Webas eﬀective anion receptors in water (i) when containing two coordinatively unsaturated metal ions, and (ii) when protonated at the secondary amine groups. Representative examples of the two approaches will be discussed in the following sections. Some cryptand-related reviews have been published recently.3–5 Origin and development of ... raymond t whiteWebMay 27, 2024 · The genesis of anion receptor chemistry can be traced back to the late 1960s with the work of Shriver and Biallas on chelating Lewis acids and Park and Simmons on ammonium-containing cryptand … raymond tusk racehorseWebSep 22, 2014 · A simple anion receptor incorporating bisamide and bispyrrole groups as recognition sites was synthesised, and its binding properties towards anions were studied by UV–vis, 1H NMR, ESI-MS spectra and theoretical calculations. This receptor exhibited a selective complexation with biologically important and F− over other anions tested in dry … raymond twum barimaWebInitially anion binding of cage 1 was accessed by 1H NMR titrations in DMSO-d 6 /0.5% H 2 O and compared with a previously reported TREN-based tripodal anion receptor 2 (Table 1).15 Surprisingly, the hexa-urea cage 1, which is expected to be a strong anion receptor, shows a similar Cl– affinity to acyclic tris-urea 2. This is attributed to raymond twitchWebSep 17, 2010 · The design of supramolecular hosts for anions began with simple diaza bicycles, named katapinands, and has evolved over the last 40 years to a number of … raymond twins today youtubeWebThe genesis of anion receptor chemistry can be traced back to the late 1960s with the work of Shriver and Biallas on chelating Lewis acids and Park and Simmons on ammonium-containing cryptand- like halide receptors. raymond twomey duncanWebApr 10, 2015 · This shows that, like already known for the heavier homologues, the presence of 18-crown-6 (1,4,7,10,13,16-hexaoxacyclooctadecane) is no precondition for the stabilization of the silicide cluster anion in solid state and the absence of the alkali metal ligand even allows for the crystallization in the higher symmetric monoclinic space group … raymond tweedly