Category: 16961-25-4

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 16961-25-4, is researched, SMILESS is Cl[Au-](Cl)(Cl)Cl.[H]O[H].[H]O[H].[H]O[H].[H+], Molecular AuCl4H7O3Journal, International Journal of Biosciences called Brown seaweed Sargassum polycystum (C. Agardh) extract as mediator in the green synthesis of colloidal gold nanoparticles from Malita, Davao Occidental Philippines, Author is Lumogdang, Leonel; Teves, Franco, the main research direction is brown seaweed Sargassum polycystum gold nanoparticle green synthesis.Recommanded Product: Hydrogen tetrachloroaurate(III) trihydrate.

One of the paradigm shifts in the field of nanotechnol. is the development of environmentally friendly, biocompatibility and green approaches in the synthesis of metal nanoparticles. In this study, the extracts of Brown seaweed, Sargassum polycystum (C.Agardh) were utilized as reducing agents in the green synthesis of gold nanoparticles. The produced gold nanoparticles were characterized using UV-visible spectroscopy, Fourier Transform IR (FTIR) spectroscopy, SEM (SEM) and Energy dispersive X-ray (EDS) spectroscopy. The different volumes of brown seaweed extract namely 25, 20, 15, 10 and 5ml when added with Tetrachloroauric acid gradually changed from color brown to ruby red, a characteristics reaction of gold nanoparticles. UV-vis spectral anal. of the gold nanoparticles showed strong peaks around 526nm to 548nm, an optical characteristic of gold nanoparticles. The presence of elemental gold was also confirmed by the EDS anal. The SEM image of the gold nanoparticles clusters of spherical morphol. with a size range of 68.5 to 240nm. The FTIR spectra of the brown seaweed mediated synthesized gold nanoparticles showed strong peaks corresponding to hydroxyl groups, and primary amines functionalities which probably acted as reducing agent, stabilizing agent and capping agent during the synthesis of gold nanoparticles.

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Imidazole – Wikipedia,
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SDS of cas: 16961-25-4. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Hydrogen tetrachloroaurate(III) trihydrate, is researched, Molecular AuCl4H7O3, CAS is 16961-25-4, about A general one-pot synthetic strategy to reduced graphene oxide (rGO) and rGO-nanoparticle hybrid materials. Author is Albers, Rebecca F.; Bini, Rafael A.; Souza, Joao B. Jr.; Machado, Derik T.; Varanda, Laudemir C..

There is great interest in new materials that synergistically combine properties of reduced graphene oxide (rGO) with nanoparticles (NP) generating rGO-nanoparticles hybrid materials (NPHM). Based on the modified polyol process (MPP), we developed a new and versatile method to synthesize rGO and rGO-NPHM in 1-pot route. The rGO sheets with small defects number were reduced from graphene oxide by the MPP, and exptl. parameters were varied to evaluate the method robustness, and adjusted to prepare rGO-NPHM, for instance, rGO/Au, rGO/Ag, rGO/CdSe, rGO/FePt and rGO/Fe3O4 inferring the versatility of our methodol. NPHM were evaluated by X-ray diffraction, transmission electron microscopy, vibrating sample magnetometry, and Raman, UV-Vis, and FTIR spectroscopies. All synthesized NPHM shown size-controlled monodisperse-like NP homogeneously distributed onto the rGO sheets, except for the Ag-NP where a bimodal size distribution was observed Plasmon (rGO/Au and rGO/Ag) and typical absorption and emission (rGO/CdSe) by UV-Vis, whereas paramagnetic-like (rGO/FePt) and superparamagnetic (rGO/Fe3O4) behavior was observed by the magnetic NPHM. The MPP is already efficient for NP preparation and here, we showed that its might successful for rGO and rGO-NPHM synthesis in a simple and versatile 1-pot route, which can be scaled up to allow mass production and easily tuned for other NP kinds.

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Imidazole – Wikipedia,
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Recommanded Product: 16961-25-4. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Hydrogen tetrachloroaurate(III) trihydrate, is researched, Molecular AuCl4H7O3, CAS is 16961-25-4, about Ensemble effects in Cu/Au ultrasmall nanoparticles control the branching point for C1 selectivity during CO2 electroreduction. Author is Shang, Hongyu; Kim, Dongjoon; Wallentine, Spencer K.; Kim, Minkyu; Hofmann, Daniel M.; Dasgupta, Runiya; Murphy, Catherine J.; Asthagiri, Aravind; Baker, L. Robert.

Bimetallic catalysts provide opportunities to overcome scaling laws governing selectivity of CO2 reduction (CO2R). Cu/Au nanoparticles show promise for CO2R, but Au surface segregation on particles with sizes ≥7 nm prevent investigation of surface atom ensembles. Here we employ ultrasmall (2 nm) Cu/Au nanoparticles as catalysts for CO2R. The high surface to volume ratio of ultrasmall particles inhibits formation of a Au shell, enabling the study of ensemble effects in Cu/Au nanoparticles with controllable composition and uniform size and shape. Electrokinetics show a nonmonotonic dependence of C1 selectivity between CO and HCOOH, with the 3Au:1Cu composition showing the highest HCOOH selectivity. D. functional theory identifies Cu2/Au(211) ensembles as unique in their ability to synthesize HCOOH by stabilizing CHOO* while preventing H2 evolution, making C1 product selectivity a sensitive function of Cu/Au surface ensemble distribution, consistent with exptl. findings. These results yield important insights into C1 branching pathways and demonstrate how ultrasmall nanoparticles can circumvent traditional scaling laws to improve the selectivity of CO2R.

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Imidazole – Wikipedia,
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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Hydrogen tetrachloroaurate(III) trihydrate, is researched, Molecular AuCl4H7O3, CAS is 16961-25-4, about High-performance estimation of lead ion concentration using smartphone-based colorimetric analysis and a machine learning approach, the main research direction is high performance lead ion concentration smartphone colorimetry machine learning.Computed Properties of AuCl4H7O3.

Traditional methods for detection of lead ions in water samples are costly and time-consuming. In this work, an accurate smartphone-based colorimetric sensor was developed utilizing a novel machine learning algorithm. In the presence of Pb2+ ions in the solution of specifically functionalized gold nanoparticles, the color of solution turns from red to purple. Indeed, the color variation of the solution is proportional to Pb2+ concentration The smartphone camera captures the corresponding color change, and the image is processed by an efficient artificial intelligence protocol. The nonlinear regression approach was used for concentration estimation, in which the parameters of the proposed model are obtained using a new feature extraction algorithm. In prediction of Pb2+ concentration, the average absolute error and root-mean-square error were 0.094 and 0.124, resp. The influence of pH of the medium, temperature, oligonucleotide concentration, and reaction time on the performance of the proposed sensor was carefully investigated and understood to achieve the best sensor response. This novel sensor exhibited good linearity for the detection of Pb2+ in the concentration range of 0.5-2000 ppb with a detection limit of 0.5 ppb.

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Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 16961-25-4, is researched, SMILESS is Cl[Au-](Cl)(Cl)Cl.[H]O[H].[H]O[H].[H]O[H].[H+], Molecular AuCl4H7O3Journal, Separation and Purification Technology called The recovery and selective extraction of gold and platinum by novel ionic liquids, Author is Boudesocque, Stephanie; Mohamadou, Aminou; Conreux, Alexandra; Marin, Beatrice; Dupont, Laurent, the main research direction is gold platinum extraction ionic liquid dicyanamide thiocyanato imide.Recommanded Product: Hydrogen tetrachloroaurate(III) trihydrate.

Ionic liquids bearing tetrahexylammonium and tetraoctylammonium cations and halide (Br-), dicyanamide (Dca-), thiocyanato (SCN-) and bis(trifluoromethysulfonyl)imide (Tf2N-) by liquid-liquid extraction were studied on Au(III), Pt(II) and Pt(IV) extraction All the system show excellent extractability of Au(III). It is the same for Pt(II) and Pt(IV) except for Tf2N- based ionic liquids which do not extract Pt(II) and Pt(IV) and constitute selective system for the separation of Au and Pt from aqueous effluents. The influence of acid concentration on extraction yield is evaluated. The anion-exchange mechanism of Au(III), Pt(II) and Pt(IV) was confirmed. Reductive stripping was used for the recovery of Au(III) and Pt(IV). Tf2N- based ionic liquids show an excellent recovery of Au(III) using thiourea as back-extractant.

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Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Product Details of 16961-25-4. 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: Hydrogen tetrachloroaurate(III) trihydrate, is researched, Molecular AuCl4H7O3, CAS is 16961-25-4, about A new strategy to regulate the selectivity of photo-mediated catalytic reaction.

Here we developed a new method for regulating the selectivity of photo-mediated catalytic reaction by manipulating the surface charge of Au/TiO2 (gold/titanium dioxide) catalysts within chem. reaction timescales. Two kinds of photocatalytic reactions, hydrogenation of acetophenone and benzyl alc. oxidation, have been applied to investigate the photocatalytic performance over Au/TiO2 catalysts with tunable surface charges. We found that a suitable timescale of switching surface charge on Au would benefit for the enhanced quantum efficiency and play different roles in the selectivity of desired products in hydrogenation and oxidation reactions. Au/TiO2 catalyst under 5μs flashing light irradiation exhibits much higher selectivity of 1-phenylethanol in the hydrogenation of acetophenone than that under continuous light and 5 s flashing light irradiation; by contrast, Au/TiO2 catalysts under both flashing light and continuous light irradiation exhibit a similar selectivity of benzaldehyde in benzyl alc. oxidation Our findings will benefit for a better understanding of electronic structure-mediated reaction mechanism and be helpful for achieving highly efficient photocatalytic systems.

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Imidazole – Wikipedia,
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HPLC of Formula: 16961-25-4. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Hydrogen tetrachloroaurate(III) trihydrate, is researched, Molecular AuCl4H7O3, CAS is 16961-25-4, about Gold recovery using porphyrin-based polymer from electronic wastes: Gold desorption and adsorbent regeneration. Author is Son, Jieun; Hong, Yeongran; Han, Gyeol; Nguyen, Thien S.; Yavuz, Cafer T.; Han, Jong-In.

Electronic wastes containing precious metals have great potential as a sustainable source of such metals. Separation and refining, however, remain complicated, and none of the existing technologies have yet experienced commercialization. A novel porphyrin-based porous polymer, named COP-180, was recently introduced as a powerful adsorbent option, especially for gold, and in this study, aspects of desorption and recovery of adsorbed gold and regeneration of the polymer were investigated. A hydrometallurgical method using non-cyanide leaching agents was developed, and an acid thiourea-based solution was found to be particularly suited for the method based on COP-180 with gold desorption efficiency of 97%. Fourier-transform IR spectroscopy spectra demonstrated the unaffected structure of COP-180 after desorption, implying the potential of its reuse. This high desorption efficiency was achieved even without typical aiding agents by means of a formamidine disulfide-mediated route that prevented thiourea consumption, which is considered a major drawback of the otherwise promising reagent. Using this method, the polymer was able to maintain more than 94% desorption efficiency after five times of regeneration. The results suggest that acid thiourea can offer a workable means of recovering gold particularly from the excellent gold-adsorbent of COP-180, and that repeated regeneration is also possible.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 16961-25-4, is researched, SMILESS is Cl[Au-](Cl)(Cl)Cl.[H]O[H].[H]O[H].[H]O[H].[H+], Molecular AuCl4H7O3Journal, Article, Research Support, Non-U.S. Gov’t, Research Support, U.S. Gov’t, Non-P.H.S., Environmental Science & Technology called Direct Quantification of the Effect of Ammonium on Aerosol Droplet pH, Author is Huang, Qishen; Wei, Haoran; Marr, Linsey C.; Vikesland, Peter J., the main research direction is ammonium aerosol droplet pH nanoprobe.Category: imidazoles-derivatives.

Ammonium is an important atm. constituent that dictates many environmental processes. The impact of the ammonium ion concentration on 10-50μm aerosol droplet pH was quantified using pH nanoprobes and surface-enhanced Raman spectroscopy (SERS). Sample solutions were prepared by mixing 1 M ammonium sulfate (AS), ammonium nitrate (AN), sodium sulfate (SS), or sodium nitrate (SN) solutions with 1 M phosphate buffer (PB) at different volume ratios. Stable pH values were measured for pure PB, AS, and AN droplets at different concentrations The centroid pH of 1 M PB droplets was ~11, but when PB was systematically replaced with ammonium (AS- or AN-PB), the centroid pH within the droplets decreased from ≈11 to 5.5. Such a decrease was not observed in sodium (SS- or SN-PB) droplets, and no pH differences were observed between sulfate and nitrate salts. Ammonia partitioning to the gas phase in ammonium-containing droplets was evaluated to be negligible. Raman sulfate peak (~980 cm-1) intensity measurements and surface tension measurements were conducted to investigate changes in ion distribution. The pH difference between ammonium-containing droplets and ammonium-free droplets is attributed to the alteration of the ion distribution in the presence of ammonium.

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Imidazole – Wikipedia,
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Related Products of 16961-25-4. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Hydrogen tetrachloroaurate(III) trihydrate, is researched, Molecular AuCl4H7O3, CAS is 16961-25-4, about Electrokinetic preseparation and molecularly imprinted trapping for highly selective SERS detection of charged phthalate plasticizers. Author is Yang, Yuanyuan; Li, Yuanting; Zhai, Wenlei; Li, Xuejian; Li, Dan; Lin, Hualin; Han, Sheng.

Nonspecific binding and weak spectral discernment are the main challenges for surface-enhanced Raman scattering (SERS) detection, especially in real sample anal. Herein, molecularly imprinted polymer (MIP)-based core-shell AuNP@polydopamine (AuNP@PDA-MIP) nanoparticles (NPs) are designed and immobilized on an electrochem. reduced MoS2-modified screen-printed electrode (SPE). This portable electrochem.-Raman interface offers the dual functions of electrokinetic presepn. (EP) and MIP trapping of charged mols. so that a reliable SERS recognition with mol. selectivity and high sensitivity can be achieved. Core-shell AuNP@PDA-MIP NPs can be controllably synthesized, possess predesigned specific recognition, and provide “”hot spots”” at the junction of NPs. The introduction of an elec. field enables the autonomous exclusion and separation of similarly charged mols. as well as attraction and concentration of the oppositely charged mols. by electrostatic attraction. Subsequently, the specific MIP recognition cavities allow selective adsorption of targets on the interface without the interference of analogs. Owing to the distinctive design of the multiple coupling separation, trapping, and enrichment strategies, the MIP-based SERS-active interface can be used for label-free detection of charged mols. in real samples without pretreatment. As a proof-of-concept study, label-free SERS detection of charged phthalate plasticizers (PAEs) was demonstrated with a detection limit as low as 2.7 x 10-12 M for di-Me phthalate (DMP) and 2.3 x 10-11 M for di(2-ethylhexyl) phthalate (DEHP). This sensing strategy for in situ SERS anal. of charged pollutants or toxins holds vast promises for a wide range of in-field applications.

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The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: Hydrogen tetrachloroaurate(III) trihydrate(SMILESS: Cl[Au-](Cl)(Cl)Cl.[H]O[H].[H]O[H].[H]O[H].[H+],cas:16961-25-4) is researched.Computed Properties of C10H9NO2. The article 《Rational Synthesis of Porous Graphitic-like Carbon Nitride Nanotubes Codoped with Au and Pd as an Efficient Catalyst for Carbon Monoxide Oxidation》 in relation to this compound, is published in Langmuir. Let’s take a look at the latest research on this compound (cas:16961-25-4).

The precise fabrication of efficient catalysts for CO oxidation is of particular interest in a wide range of industrial and environmental applications. Herein, a scalable method is presented for the controlled synthesis of graphitic-like porous carbon nitride nanotubes (gC3N4NTs) codoped with Au and Pd (Au/Pd/gC3N4NTs) as efficient catalysts for carbon monoxide (CO) conversion. This includes the activation of melamine with nitric acid in the presence of ethylene glycol and metal precursors followed by consecutive polymerization and carbonization. This drives the formation of porous one-dimensional gC3N4NT with an outstanding surface area of (320.6 m2 g-1) and an at.-level distribution of Au and Pd. Intriguingly, the CO conversion efficiency of Au/Pd/gC3N4NTs was substantially greater than that for gC3N4NTs. The approach thus presented may provide new avenues for the utilization of gC3N4 doped with multiple metal-based catalysts for CO conversion reactions which had been rarely reported before.

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Imidazole – Wikipedia,
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