Cryptand anion receptor
WebJan 30, 2001 · Anion recognition chemistry has grown from its beginnings in the late 1960s with positively charged ammonium cryptand receptors for halide binding to, at the end of the millennium, a plethora of charged and neutral, cyclic and acyclic, inorganic and organic supramolecular host systems for the selective complexation, detection, and separation of …
Cryptand anion receptor
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Webassembled, purely organic[9] hosts for anions are still scarce. To the best of our knowledge, self-assembled, purely organic hosts for ion pairs are elusive. Examples for self-assembled, organic anion receptors include hydrogen-bonded cages (guest: PO 4 3-or SO 4 2-),[10] disulfide-based dimers of cyclic peptides (guest: SO 4 WebMar 22, 2011 · This review describes the development of pyridine and pyridinium-based anion receptors, separated into topologically distinct acyclic, macrocyclic, macrobicyclic and interlocked host systems....
WebDec 10, 2012 · In the present paper, we investigate how the attachment of an intraannular amido-pnitrophenyl substituent (lariat arm) on the 26-membered unclosed cryptand of type 1 influences the molecular... WebJan 1, 2015 · Abstract. Anion binding is a timely research field that is developing rapidly because anions play important roles in many areas. Hydrogen (H)-bonding has proven to be a highly effective tool in binding anions due to its directionality and strength. This chapter focuses on the H-bonding-driven anion recognition by neutral receptors that bear H ...
WebA 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. ... Cryptand-like anion receptors ... WebAug 20, 2008 · One water dimer, one circular water trimer, one linear water trimer, and one water hexamer are formed inside the cryptand cavity of [H6L]6+ when different anions …
WebCryptand-like anion receptors. The design of supramolecular hosts for anions began with simple diaza bicycles, named katapinands, and has evolved over the last 40 years to a …
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 ... rite baby shoesWebFeb 1, 2012 · The synthesis and anion complexation properties of two hybrid cyclic peptide–thiourea cryptands have been studied. Receptors encapsulate sulphate via nine … smith and wesson 916aWebIn this work, the nature and selectivity of confined hydrogen bonds inside cryptands were computationally analyzed with the energy decomposition scheme based on the block-localized wavefunction method (BLW-ED), aiming at an elucidation of governing factors in the binding between cryptands and anions. smith and wesson 915 9mmWebSep 1, 2014 · Perchlorate 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 … smith and wesson 9 2.0 bb pistol videoWebNov 22, 2024 · To achieve this, typically a large molecular receptor is designed that wraps around a bound anion in a hydrophobic microenvironment. Such receptors require multi-step synthesis and … smith and wesson 915 for saleWebJun 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 cancer development, anion receptors or ... smith and wesson 92WebSep 8, 2016 · Anion receptor chemistry concerns the design of molecules that recognize, respond to, or sense species that carry a negative charge. This area of supramolecular chemistry has a number of applications, including in organocatalysis (where metal-free molecules can catalyze reactions via hydrogen-bonding interactions), in separating … smith and wesson 926