Category: 33941-15-0

Thapa, Pawan; Byrnes, Nicholas K.; Denisenko, Alena A.; Mao, James X.; McDonald, Austin D.; Newhouse, Charleston A.; Vuong, Thanh T.; Woodruff, Katherine; Nam, Kwangho; Nygren, David R.; Jones, Benjamin J. P.; Foss, Frank W. Jr. published an article about the compound: 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane( cas:33941-15-0,SMILESS:O1CCOCCOCCOCCOCCNCC1 ).Recommanded Product: 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:33941-15-0) through the article.

Single-mol. fluorescence imaging (SMFI) of gas-phase ions has been proposed for “”barium tagging,”” a burgeoning area of research in particle physics to detect individual barium daughter ions. This has potential to significantly enhance the sensitivity of searches for neutrinoless double-beta decay (0νββ) that is obscured by background radiation events. The chem. required to make such sensitive detection of Ba2+ by SMFI in dry Xe gas at solid interfaces has implications for solid-phase detection methods but has not been demonstrated. Here, we synthesized simple, robust, and effective Ba2+-selective chemosensors capable of function within ultrapure high-pressure 136Xe gas. Turn-on fluorescent naphthalimide-(di)azacrown ether chemosensors were Ba2+-selective and achieved SMFI in a polyacrylamide matrix. Fluorescence and NMR experiments supported a photoinduced electron transfer mechanism for turn-on sensing. Ba2+ selectivity was achieved with computational calculations correctly predicting the fluorescence responses of sensors to barium, mercury, and potassium ions. With these mols., dry-phase single-Ba2+ ion imaging with turn-on fluorescence was realized using an oil-free microscopy technique for the first time-a significant advance toward single-Ba2+ ion detection within large volumes of 136Xe, plausibly enabling a background-independent technique to search for the hypothetical process of 0νββ.

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Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Thapa, P.; Arnquist, I.; Byrnes, N.; Denisenko, A. A.; Foss, Jr. F. W.; Jones, B. J. P.; McDonald, A. D.; Nygren, D. R.; Woodruff, K. researched the compound: 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane( cas:33941-15-0 ).Product Details of 33941-15-0.They published the article 《Barium Chemosensors with Dry-Phase Fluorescence for Neutrinoless Double Beta Decay》 about this compound( cas:33941-15-0 ) in Scientific Reports. Keywords: barium chemosensor phase fluorescence neutrinoless double beta decay. We’ll tell you more about this compound (cas:33941-15-0).

The nature of the neutrino is one of the major open questions in exptl. nuclear and particle physics. The most sensitive known method to establish the Majorana nature of the neutrino is detection of the ultra-rare process of neutrinoless double beta decay. However, identification of one or a handful of decay events within a large mass of candidate isotope, without obfuscation by backgrounds is a formidable exptl. challenge. One hypothetical method for achieving ultra- low-background neutrinoless double beta decay sensitivity is the detection of single 136Ba ions produced in the decay of 136Xe (“”barium tagging””). To implement such a method, a single-ion-sensitive barium detector must be developed and demonstrated in bulk liquid or dry gaseous xenon. This paper reports on the development of two families of dry-phase barium chemosensor mols. for use in high pressure xenon gas detectors, synthesized specifically for this purpose. One particularly promising candidate, an anthracene substituted aza-18-crown-6 ether, is shown to respond in the dry phase with almost no intrinsic background from the unchelated state, and to be amenable to barium sensing through fluorescence microscopy. This interdisciplinary advance, paired with earlier work demonstrating sensitivity to single barium ions in solution, opens a new path toward single ion detection in high pressure xenon gas.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Quality Control of 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane, is researched, Molecular C12H25NO5, CAS is 33941-15-0, about Towards a background-free neutrinoless double beta decay experiment based on a fluorescent bicolor sensor.

Neutrinoless double beta decay (ββ0v) is a putative nuclear decay that can occur if, and only if, neutrinos are their own antiparticles. Due to the smallness of neutrino masses, the lifetime of ββ0v is expected to be larger than 1 × 1026 yr, and the tiny expected signals are deeply buried in backgrounds associated with the natural radioactive chains, whose characteristic lifetime is sixteen orders of magnitude faster. Since no known background processes converts xenon to barium, detection of the daughter ion in candidate decay events effectively eliminates backgrounds. It has been recently proposed that a xenon gas time projection chamber could unambiguously tag the ββ0v decay 136Xe → Ba2+ + 2e-(+2v) by detecting the resulting Ba2+ ion in a single-atom sensor made of a monolayer of mol. indicators. The Ba2+ would be captured by one of the mols. in the sensor, and the presence of the single chelated indicator would be subsequently revealed by a strong fluorescent response from repeated interrogation with a suitable laser system. Here we describe a fluorescent bicolor indicator that binds strongly to Ba2+ and shines very brightly, shifting its emission color from green to blue when chelated in dry medium, thus providing a discrimination factor with respect to the unchelated species in excess of 104.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 33941-15-0, is researched, Molecular C12H25NO5, about Red-Emitting Fluorescence Sensors for Metal Cations: The Role of Counteranions and Sensing of SCN- in Biological Materials, the main research direction is fluorescence sensor thiocyanate; aza-crown; counteranion; fluorescence; intramolecular-charge transfer; phthalocyanine.Related Products of 33941-15-0.

The spatiotemporal sensing of specific cationic and anionic species is crucial for understanding the processes occurring in living systems. Herein, the authors developed new fluorescence sensors derived from tetrapyrazinoporphyrazines (TPyzPzs) with a recognition moiety that consists of an aza-crown and supporting substituents. Their sensitivity and selectivity were compared by fluorescence titration experiments with the properties of known TPyzPzs (with either one aza-crown moiety or two of these moieties in a tweezer arrangement). Method of standard addition was employed for analyte quantification in saliva. For K+ recognition, the new derivatives had comparable or larger association constants with larger fluorescence enhancement factors compared to that with one aza-crown. Their fluorescence quantum yields in the ON state were 18× higher than that of TPyzPzs with a tweezer arrangement. Importantly, the sensitivity toward cations was strongly dependent on counteranions and increased as follows: NO3- < Br- < CF3SO3- < ClO4- ≪ SCN-. This trend resembles the chaotropic ability expressed by the Hofmeister series. The high selectivity toward KSCN was explained by synergic association of both K+ and SCN- with TPyzPz sensors. The sensing of SCN- was further exploited in a proof of concept study to quantify SCN- levels in the saliva of a smoker and to demonstrate the sensing ability of TPyzPzs under in vitro conditions. This literature about this compound(33941-15-0)Related Products of 33941-15-0has given us a lot of inspiration, and I hope that the research on this compound(1,4,7,10,13-Pentaoxa-16-azacyclooctadecane) can be further advanced. Maybe we can get more compounds in a similar way.

Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane, is researched, Molecular C12H25NO5, CAS is 33941-15-0, about Switching Dual Catalysis without Molecular Switch: Using A Multicomponent Information System for Reversible Reconfiguration of Catalytic Machinery, the main research direction is copper zinc terpyridine porphyrinato complex catalyst preparation kinetics.Application In Synthesis of 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane.

Different from the current paradigms of chem., a switchable catalytic system is presented that does not rely on a mol. switch in different toggling states but on a smart seven-component mixture that manages the reversible ON/OFF regulation of two catalytic processes. Hereunto, the workflow of two multicomponent rotary catalytic machineries was interlinked by the simultaneous shuffling of two components (metal and ligand) requiring perfect signaling in a 13-component system (see Movie 1). This network underwent reversible switching over three cycles as demonstrated by 1H NMR, UV-visible, and fluorescence spectroscopies and electrospray ionization mass spectrometry. Addition and removal of zinc(II) ions trigger three distinct events in parallel: the (i) mutually dependent self-assembly of three-component nanorotors and two-component reservoirs by resorting components, (ii) toggling between vastly different rotational exchange rates in the self-assembled rotors that directly affect catalysis, and (iii) toggling between two diverse catalytic reactions in a fully reproducible manner. Because of this information system, the concentrations of free aza-crown ether 7 and its complex with copper(I), i.e., [Cu(7)]+, which represent the effective catalysts, are up- and downregulated in a manner to alternately switch ON/OFF a catalytic conjugate addition and a click reaction.

From this literature《Switching Dual Catalysis without Molecular Switch: Using A Multicomponent Information System for Reversible Reconfiguration of Catalytic Machinery》,we know some information about this compound(33941-15-0)Application In Synthesis of 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane, but this is not all information, there are many literatures related to this compound(33941-15-0).

Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane(SMILESS: O1CCOCCOCCOCCOCCNCC1,cas:33941-15-0) is researched.Formula: C11H9N. The article 《Selective Phase Transfer Reagents (OxP-crowns) for Chromogenic Detection of Nitrates Especially Ammonium Nitrate》 in relation to this compound, is published in Chemistry – A European Journal. Let’s take a look at the latest research on this compound (cas:33941-15-0).

Nitrogen and phosphorus-containing ions such as ammonium, nitrates and phosphates are anthropogenic pollutants while ammonium nitrate may be diverted for nefarious purposes in improvised explosive devices. Crown ether-oxoporphyrinogen conjugates (OxP-crowns) are used to selectively detect nitrates, especially their ion pairs with K+ and NH4+, based on ion pair complexation of OxP-crowns under phase transfer conditions. The presence of phosphate and carbonate lead to deprotonation of OxP-crowns. OxP-1N18C6 is capable of extracting ion pairs with nitrate from aqueous phase leading to a selective chromogenic response. Deprotonation of the OxP moiety leads to [OxP-]-1N18C6[K+] and is promoted by crown ether selective cation binding coupled with hydration of basic oxoanions, which are constrained to remain in the aqueous phase. This work illustrates the utility of mol. design to exploit partitioning and ion hydration effects establishing the selectivity of the chromogenic response.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 33941-15-0, is researched, Molecular C12H25NO5, about Catalytic Systems for the Synthesis of Biscarbonates and Their Impact on the Sequential Preparation of Non-Isocyanate Polyurethanes, the main research direction is catalytic system biscarbonate isocyanate polyurethane.Name: 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane.

The synthesis of non-isocyanate polyurethanes (NIPUs) has recently gained great attention. In this respect, a bifunctional catalyst and an abundant metal catalyst system were investigated for the conversion of polyfunctional epoxides to gain general access to the corresponding cyclic carbonates as monomers for NIPU synthesis. A Ca-based catalytic system and a bifunctional ammonium salt were established for the synthesis of these monomers. In total, 14 terminal polyfunctional epoxides were converted to the corresponding carbonates in yields up to 99% and high purities. With regard to the one-pot synthesis of NIPUs directly from epoxides and CO2, the influence of the catalyst systems was evaluated. In general, both catalytic systems allowed the synthesis of NIPUs in a sequential one-pot procedure yielding polymers with a mol. mass of up to 19 kg·mol-1. The synthesis of monomers bearing multiple cyclic carbonate-units and an easy access to NIPUs in a sequential one-pot-process is reported.

There is still a lot of research devoted to this compound(SMILES：O1CCOCCOCCOCCOCCNCC1)Name: 1,4,7,10,13-Pentaoxa-16-azacyclooctadecane, and with the development of science, more effects of this compound(33941-15-0) can be discovered.

Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Langmuir called Expansion of Ion Effects on Water Induced by a High Hydrophilic Surface of a Polymer Network, Author is Park, Ki Chul; Tsukahara, Takehiko, which mentions a compound: 33941-15-0, SMILESS is O1CCOCCOCCOCCOCCNCC1, Molecular C12H25NO5, Electric Literature of C12H25NO5.

The spatial extent and anion-cation cooperativity of the ion effect on the structure and dynamics of water have long been debated but are still controversial. Previously, we exptl. demonstrated the extensive and cooperative effect of ions on water in a polyamide network by measuring the reflection wavelength (λ) on the ion sensor of poly(N-isopropylacrylamide) (PNIPAAm) hydrogel-immobilized photonic crystals. In the present study, we studied the influence of the polymer surface on the ion effect by adopting a highly hydrophilic poly(N-isopropylacrylamide-co-N-acryloylaza-18-crown-6) hydrogel as a sensor matrix. In alk. earth metal salt solutions, the copolymer hydrogel membrane sensor showed the red shift of λ for the specific combination of cations and anions, i.e., Ca2+/Cl- and Sr2+/NO3-, which resulted from the concerted binding of ion pairs to the copolymer receptor. In alkali metal salt solutions, the ion sensor showed the blueshift of λ originating from the osmotic dehydration suppressed by the salts. The strength of the ion effect was evaluated by the average osmotic pressure (ΠA) required for the salt-inhibited dehydration in the early stage of hydrogel contraction. From the calculation results of ΠA for the copolymer and PNIPAAm hydrogels, the high hydrophilic copolymer surface more significantly enhanced the ion effect of structure-making cations (i.e., Li+) compared with borderline (Na+) and structure-breaking (K+ and Cs+) cations. Furthermore, the ion effect exhibited the higher ion cooperativity in combination with chloride anions than with nitrate anions. The enhancement of the long-range cooperative ion effect is derived from the expansion of the interactions between ions, water mols., and the hydrophilic polymer network.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Investigation of cation binding and sensing by new crown ether core substituted naphthalene diimide systems, published in 2019, which mentions a compound: 33941-15-0, mainly applied to naphthalene diimide crown ether cation binding electrostatic interaction, Electric Literature of C12H25NO5.

Crown ethers are effective at binding cations and through substitution onto the core of photoactive naphthalene diimide mols. (NDIs), cation binding can be detected via changes in UV-visible absorption and/or fluorescence emission. In this work, two new NDI-crown ether cation sensors (aza-15-crown-5 ether NDI, 5, and aza-18-crown-6 ether NDI, 6) have been synthesized and changes in UV-visible and fluorescence spectra upon addition of various cations investigated. A substantial blue shift in the UV-visible absorption of 75 nm was observed for 6 with a 1 : 1 addition of Na+ or K+, providing a clear colorimetric readout, however, no significant spectral changes were observed for 5 with the cations trialled at this level of analyte. Calcium cations do, however, elicit a response from 5 at substantially higher molar ratios, with some perturbation of the absorption spectrum observable, and an approx. six-fold increase in fluorescence emission. Theor. calculations indicate that for 6, K+ and Na+ bind to the ether oxygens resulting in a blue shift similar to that observed exptl. Ca2+ however, was found to bind quite differently with 5via both the ether oxygens and the carbonyl group on the NDI. This observation highlights how small structural changes can lead to different and unexpected behavior and that investigation of underlying binding mechanisms is important to inform the rational design of future systems.

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Reference:
Benzoxazole – Wikipedia,
Benzoxazole | C7H5NO – PubChem