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Artigos de revistas sobre o tema "Anions"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Yamuna, Thammarse S., Jerry P. Jasinski, Manpreet Kaur, Brian J. Anderson, and H. S. Yathirajan. "5-(4-Fluorophenyl)-2H-pyrazol-1-ium 2,2,2-trifluoroacetate." Acta Crystallographica Section E Structure Reports Online 70, no. 4 (2014): o429—o430. http://dx.doi.org/10.1107/s1600536814005200.

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The title salt, C9H8FN2+·C2F3O2−, crystallizes with two independent cations (AandB) and two independent anions (CandD) in the asymmetric unit. In the cations, the dihedral angles between the benzene and pyrazolium rings are 23.7 (3)° in cationAand 1.8 (8)° in cationB. In the crystal, each anion links to the two cationsviaN—H...O hydrogen bonds, forming a U-shaped unit with anR44(14) ring motif. These U-shaped units stack along theaaxis and are linkedviaC—H...O and C—H...F hydrogen bonds, forming slabs lying parallel to (100). Within the slabs there are π–π interactions between the pyrazolium r

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2

Schefe, C. R., M. Watt, W. J. Slattery, and P. M. Mele. "Organic anions in the rhizosphere of Al-tolerant and Al-sensitive wheat lines grown in an acid soil in controlled and field environments." Soil Research 46, no. 3 (2008): 257. http://dx.doi.org/10.1071/sr07139.

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Several sampling methods were investigated for the quantification of organic anions in the rhizosphere of Al-tolerant (ET8) and Al-sensitive (ES8) wheat plants in soil systems. Controlled environment studies used anion exchange membranes to collect rhizosphere organic anions (from root tips and mature regions of nodal roots) from ET8 and ES8 plants at the 6-leaf stage in a glasshouse environment. Using the anion exchange membranes, a selection of organic anions were detected on the tips and mature regions of roots, with ET8 and ES8 having similar rhizosphere organic anion profiles. The field e

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3

Parthé, Erwin. "Crystal chemical information to be obtained from the bond-number equality concept." Acta Crystallographica Section B Structural Science 62, no. 2 (2006): 335–37. http://dx.doi.org/10.1107/s0108768106003065.

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Based on the bond-number equality concept an equation is derived for anion complexes of normal valence compounds with triangularly and/or tetrahedrally coordinated central atoms and anions having one, two, three and four bonds to central atoms: %Δ = 4 − (n/m′) × [2 − %A [1] + %A [3] + 2 × %A [4]]. %Δ is the ratio of the number of central atoms with triangular anion coordination to the sum of all central atoms in the anion complex. n/m′ is the ratio of the number of all A anions to the number of all central atoms C′ in the anion complex. %A [1] is the ratio of the number of anions with one bond

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4

Li, Lei, Yu-Jian Hong, Dong-Yang Chen, Wang-Chuan Xiao та Mei-Jin Lin. "Anion–π interactions in lithium–organic redox flow batteries". Chemical Communications 55, № 16 (2019): 2364–67. http://dx.doi.org/10.1039/c8cc09834d.

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The interactions between the electrolyte anions and electron-deficient redox-active organic molecules (anion–π interactions) have strong influences on the battery properties due to the anion–π-induced formation of radical anions or sandwich-like aggregates.

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5

Wilkinson, Hazel S., and William T. A. Harrison. "Hexane-1,6-diammonium bis(dihydrogenarsenate): infinite anionic layers containing R 6 6(24) loops." Acta Crystallographica Section E Structure Reports Online 63, no. 3 (2007): m902—m904. http://dx.doi.org/10.1107/s1600536807007672.

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The title compound, C6H18N2 2+·2H2AsO4 −, contains a network of doubly protonated centrosymmetric hexane-1,6-diammonium cations and dihydrogenarsenate anions. These species interact by way of cation-to-anion N—H...O and anion-to-anion O—H...O hydrogen bonds, the latter leading to infinite sheets of the H2AsO4 − anions.

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6

Salhany, James M. "Anion binding characteristics of the band 3 / 4,4'-dibenzamidostilbene-2,2'-disulfonate binary complex: Evidence for both steric and allosteric interactions." Biochemistry and Cell Biology 77, no. 6 (1999): 543–49. http://dx.doi.org/10.1139/o99-061.

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A novel kinetic approach was used to measure monovalent anion binding to better define the mechanistic basis for competition between stilbenedisulfonates and transportable anions on band 3. An anion-induced acceleration in the release of 4,4prime-dibenzamidostilbene-2,2prime-disulfonate (DBDS) from its complex with band 3 was measured using monovalent anions of various size and relative affinity for the transport site. The K1/2 values for anion binding were determined and correlated with transport site affinity constants obtained from the literature and the dehydrated radius of each anion. The

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7

Attiogbe, Francis K., Samar K. Bose, Wei Wang, Alastair McNeillie, and Raymond C. Francis. "The peroxymonocarbonate anions as pulp bleaching agents. Part 1. Results with lignin model compounds and chemical pulps." BioResources 5, no. 4 (2010): 2208–20. http://dx.doi.org/10.15376/biores.5.4.2208-2220.

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The peroxymonocarbonate mono-anion (HCO4─) is generated when the bicarbonate anion is added to a H2O2 solution. The mono-anion is believed to have a pKa value of ca. 10 and as such would start dissociating to the di-anion (CO42─) at pH ca. 8. The mono-anion should demonstrate electrophilic properties, while the di-anion should be a nucleophile. In an alkaline, non-sulfur pulping process such as soda/AQ, Na2CO3 could be obtained from the chemical recovery system and carbonated with CO2 from a flue gas stream to produce NaHCO3. In such a case only H2O2 would need to be purchased to generate the

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8

Yuan, Dan, and Yuan Fang Li. "Carboxyphenyl-terpyridine-based series of gels for procedural visual recognition of multi-anions." Analytical Methods 10, no. 41 (2018): 5032–37. http://dx.doi.org/10.1039/c8ay01679h.

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The gelation of 4-[2,2′:6′,2′′-terpyridine]-4′-ylbenzoic acid (Hcptpy) occurred with various metal ions and specific anions. With the gel formation, corresponding metal ions and anions were recognized. Also, the metal–organic gels (MOGs) possess stimuli response property to anions. A step-by-step anion recognition progress was established based on one Hcptpy ligand and realized the selective identification 12 kinds of anions.

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9

Kovanda, František, Eva Kovácsová, and David Koloušek. "Removal of Anions from Solution by Calcined Hydrotalcite and Regeneration of Used Sorbent in Repeated Calcination-Rehydration-Anion Exchange Processes." Collection of Czechoslovak Chemical Communications 64, no. 9 (1999): 1517–28. http://dx.doi.org/10.1135/cccc19991517.

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Synthetic hydrotalcite calcined at 350-550 °C was used for the removal of arsenate, chromate, and vanadate ions from water solutions. The initial anion concentrations were 0.002 mol l-1. The sorption isotherms were measured at 20 °C and at neutral pH. The Langmuir adsorption isotherm was used for the sorption capacity evaluation. The ability of the calcined hydrotalcite to remove the anions from solution decreased in the order of vanadate - arsenate - chromate. The hydrotalcite calcined at 450 °C exhibited the best sorption ability for all the anions. The sorbed anions were released by anion e

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10

McCarty, Nael A., and Zhi-Ren Zhang. "Identification of a region of strong discrimination in the pore of CFTR." American Journal of Physiology-Lung Cellular and Molecular Physiology 281, no. 4 (2001): L852—L867. http://dx.doi.org/10.1152/ajplung.2001.281.4.l852.

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The variety of methods used to identify the structural determinants of anion selectivity in the cystic fibrosis transmembrane conductance regulator Cl− channel has made it difficult to assemble the data into a coherent framework that describes the three-dimensional structure of the pore. Here, we compare the relative importance of sites previously studied and identify new sites that contribute strongly to anion selectivity. We studied Cl−and substitute anions in oocytes expressing wild-type cystic fibrosis transmembrane conductance regulator or 12-pore-domain mutants to determine relative perm

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11

Xie, Huifang, and Ming Wah Wong. "Computational Design of Thiourea-based Cyclophane Sensors for Small Anions." Australian Journal of Chemistry 65, no. 3 (2012): 303. http://dx.doi.org/10.1071/ch11389.

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The host–guest binding properties of a tri-thiourea cyclophane receptor (1) with several common anions have been investigated using density functional theory (DFT) and molecular dynamics calculations. Receptor 1 is predicted to be an effective receptor for binding small halogen and Y-shaped (NO3– and AcO–) anions in the gas phase, cyclohexane and chloroform. The calculated order of anion binding affinity for the receptor 1 in chloroform is F– > Cl– > AcO– > NO3– >Br– > H2PO4– > HSO4–. The binding free energies are strongly influenced by a dielectric solvent medium. The struct

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12

Wilkinson, Hazel S., and William T. A. Harrison. "2-Methylpiperazinium bis(dihydrogenarsenate)." Acta Crystallographica Section E Structure Reports Online 63, no. 3 (2007): m900—m901. http://dx.doi.org/10.1107/s1600536807008392.

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The title compound, C5H14N2 2+·2H2AsO4 −, contains a network of centrosymmetric doubly protonated 2-methylpiperazinium cations, showing disorder of the methyl group, accompanied by dihydogenarsenate anions. The component species interact by way of cation-to-anion N—H...O and anion-to-anion O—H...O hydrogen bonds, the latter leading to infinite sheets of the H2AsO4 − anions containing R 6 6(24) supramolecular loops.

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13

Smith, Stephen S., Erich D. Steinle, Mark E. Meyerhoff, and David C. Dawson. "Cystic Fibrosis Transmembrane Conductance Regulator." Journal of General Physiology 114, no. 6 (1999): 799–818. http://dx.doi.org/10.1085/jgp.114.6.799.

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The cystic fibrosis transmembrane conductance regulator (CFTR) Cl channel exhibits lyotropic anion selectivity. Anions that are more readily dehydrated than Cl exhibit permeability ratios (PS/PCl) greater than unity and also bind more tightly in the channel. We compared the selectivity of CFTR to that of a synthetic anion-selective membrane [poly(vinyl chloride)–tridodecylmethylammonium chloride; PVC-TDMAC] for which the nature of the physical process that governs the anion-selective response is more readily apparent. The permeability and binding selectivity patterns of CFTR differed only by a

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14

Desfi, Annisa, Muhammad Zaky, Nessa Zarlita, Velly Effendy, Irfan Ananda Ismail, and Munadia Insani. "Anion Recoqnition Reactios." Journal of Global Research Education 2, no. 1 (2024): 22–26. https://doi.org/10.62194/cadrtm68.

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In the recognition of anions there are several anions that are tested so that we can recognize the anions. This praticum aims to be able to analyze various kinds of anions in a sample and write down the reaction. This praticum aims to be able to analyze various kinds of anions in a sample and write down the reaction. Analysis of this anion using the method of organoleptic methods Organoleptic properties are properties that can be measured by the senses, for example, taste, aroma, color, and so on There are several types of anions found in the samples tested. These finding implays indicate the

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15

Kellum, J. A., R. Bellomo, D. J. Kramer, and M. R. Pinsky. "Hepatic anion flux during acute endotoxemia." Journal of Applied Physiology 78, no. 6 (1995): 2212–17. http://dx.doi.org/10.1152/jappl.1995.78.6.2212.

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We sought to determine the role the liver might play in the regulation of anion-cation balance during both stable baseline conditions and acute endotoxemia. Ten pentobarbital sodium-anesthetized dogs were instrumented at laparotomy with ultrasonic flow probes around the left renal artery, portal vein, and hepatic artery, and catheters were inserted into the hepatic vein, portal vein, pulmonary artery, left renal vein, and abdominal aorta. Measurements were obtained from each site at baseline and 30-45 min after the intravenous infusion of endotoxin. The total anion flux across the liver was ca

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16

Kusama, Nobuyoshi, Mamta Gautam, Anne Marie S. Harding, Peter M. Snyder, and Christopher J. Benson. "Acid-sensing ion channels (ASICs) are differentially modulated by anions dependent on their subunit composition." American Journal of Physiology-Cell Physiology 304, no. 1 (2013): C89—C101. http://dx.doi.org/10.1152/ajpcell.00216.2012.

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Acid-sensing ion channels (ASICs) are sodium channels gated by extracellular protons. ASIC1a channels possess intersubunit Cl−-binding sites in the extracellular domain, which are highly conserved between ASIC subunits. We previously found that anions modulate ASIC1a gating via these sites. Here we investigated the effect of anion substitution on native ASICs in rat sensory neurons and heterologously expressed ASIC2a and ASIC3 channels by whole cell patch clamp. Similar to ASIC1a, anions modulated the kinetics of desensitization of other ASIC channels. However, unlike ASIC1a, anions also modul

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17

Fortenberry, R. C. "Theoretical Electronic and Rovibrational Studies for Anions of Interest to the DIBs." Proceedings of the International Astronomical Union 9, S297 (2013): 344–48. http://dx.doi.org/10.1017/s1743921313016098.

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AbstractThe dipole-bound excited state of the methylene nitrile anion (CH2CN−) has been suggested as a candidate carrier for a diffuse interstellar band (DIB) at 803.8 nm. Its corresponding radical has been detected in the interstellar medium (ISM), making the existence for the anion possible. This work applies state-of-the-art ab initio methods such as coupled cluster theory to reproduce accurately the electronic excitations for CH2CN− and the similar methylene enolate anion, CH2CHO−. This same approach has been employed to indicate that 19 other anions may possess electronically excited stat

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18

González-Ruiz, Víctor, Ángel Cores, M. Mar Caja, et al. "Fluorescence Sensors Based on Hydroxycarbazole for the Determination of Neurodegeneration-Related Halide Anions." Biosensors 12, no. 3 (2022): 175. http://dx.doi.org/10.3390/bios12030175.

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The environmental presence of anions of natural origin or anthropogenic origin is gradually increasing. As a tool to tackle this problem, carbazole derivatives are an attractive gateway to the development of luminescent chemosensors. Considering the different mechanisms proposed for anion recognition, the fluorescence properties and anion-binding response of several newly synthesised carbazole derivatives were studied. Potential anion sensors were designed so that they combined the native fluorescence of carbazole with the presence of hydrogen bonding donor groups in critical positions for ani

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19

Shafei, Gamal M. S. El, and Afaf A. Zahran. "Structural and Textural Properties of Perchlorated and Persulphated Mixed (Hydr)Oxides of Zirconium and Titanium." Adsorption Science & Technology 20, no. 8 (2002): 707–22. http://dx.doi.org/10.1260/026361702321104219.

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Perchlorated and persulphated mixed hydroxides of zirconium and titanium were prepared by coprecipitation and impregnation in aqueous HClO4 or (NH4)2S2O8 solutions of 0.05, 0.10, 0.20 and 0.40 M concentrations. An alternate sequence of impregnation followed by calcination or vice versa was conducted and the samples obtained studied using XRD, FT-IR, pyridine titration and low-temperature (–196°C) nitrogen adsorption methods. XRD indicated that the presence of titanium stabilized the tetragonal modification of zirconia and almost completely prevented the usual tetragonal → monoclinic transforma

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20

Joseph, Stefanie, Christof Suchentrunk, and Nikolaus Korber. "Dissolving Silicides: Syntheses and Crystal Structures of New Ammoniates Containing Si52– and Si94– Polyanions and the Role of Ammonia of Crystallisation." Zeitschrift für Naturforschung B 65, no. 9 (2010): 1059–65. http://dx.doi.org/10.1515/znb-2010-0901.

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The dissolution of the ternary material K6Rb6Si17 in liquid ammonia yields the solvate compound Rb4Si9 ・ 5NH3, which contains fourfold negatively charged nine atom silicon clusters Si94−. Using additionally the [2.2.2] cryptand during the dissolution results in the solvate [K(2.2.2- crypt)]2Si5 ・ 4NH3 , in which the Si52− anion is present in the crystal structure. The Si52− anion has the shape of a nearly ideal trigonal bipyramid. The starting material K6Rb6Si17 contains both Si44− and Si94− Zintl anions. In ammoniate crystal structures, Si94− anions are accessible independently of Si44− anion

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21

Haider, Azeem, Mukhtiar Ahmed, Muhammad Faisal, and Muhammad Moazzam Naseer. "Isatin as a simple, highly selective and sensitive colorimetric sensor for fluoride anion." Heterocyclic Communications 26, no. 1 (2020): 14–19. http://dx.doi.org/10.1515/hc-2020-0003.

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AbstractHerein, we report the fluoride anion sensing properties of a commercially available and inexpensive organic compound, isatin, which is found to be a highly selective and sensitive sensor. In naked-eye experiments, by addition of fluoride anions, isatin shows a dramatic color change from pale yellow to violet at room temperature, while the addition of other anions, i.e. $\mathrm{Cl}^-,$$\mathrm{Br}^-,\mathrm I^-,\mathrm{ClO}_4^-,{\mathrm H}_2\mathrm{PO}_4^-\,\mathrm{and}\,\mathrm{PF}_6^-,$did not induce any colour change. Additionally, recognition and titration studies have also been do

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22

Tan, Susie S. S., Peter C. Hauser, Nikolas A. Chaniotakis, Gabriela Suter, and Wilhelm Simon. "Anion-Selective Optical Sensors Based on a Coextraction of Anion-Proton Pairs into a Solvent-Polymeric Membrane." CHIMIA 43, no. 9 (1989): 257. https://doi.org/10.2533/chimia.1989.257.

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The design of optical sensing devices for anions based on the coextraction of anions and protons into a PVC membrane is described. The extraction is controlled by the lipophilicity of the anions, while the coextracted protons in conjunction with a hydrogen ion selective chromoionophore provide the optical signal transduction. The absorbance of the membrane at a fixed pH of the aqueous sample solution and at constant anion concentrations is related to the hydration energy (Hofmeister series) of the anions. Calibration curves, response times, and reproducibilities of such sensor systems are pres

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23

Akaike, N., N. Inomata, and T. Yakushiji. "Differential effects of extra- and intracellular anions on GABA-activated currents in bullfrog sensory neurons." Journal of Neurophysiology 62, no. 6 (1989): 1388–99. http://dx.doi.org/10.1152/jn.1989.62.6.1388.

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1. Kinetic properties of gamma-aminobutyric acid (GABA)-gated inward and outward anion currents were investigated in the frog sensory neurons perfused internally and externally with various anions with the use of a rapid concentration-jump (termed as 'concentration-clamp') technique. 2. Extracellular Br- [( Br-]o) shifted the dose-response curves of GABA-induced inward anion currents to the left without affecting the maximum values, whereas [Cl-]o, [I-]o, [No3-]o, [HCOO-]o, and [CH3COO-]o altered the rate of desensitization differently without shifting the GABA dose-response curves, indicating

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24

Talanov, M. V., V. B. Shirokov, and V. M. Talanov. "Anion order in perovskites: a group-theoretical analysis." Acta Crystallographica Section A Foundations and Advances 72, no. 2 (2016): 222–35. http://dx.doi.org/10.1107/s2053273315022147.

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Anion ordering in the structure of cubic perovskite has been investigated by the group-theoretical method. The possibility of the existence of 261 ordered low-symmetry structures, each with a unique space-group symmetry, is established. These results include five binary and 14 ternary anion superstructures. The 261 idealized anion-ordered perovskite structures are considered as aristotypes, giving rise to different derivatives. The structures of these derivatives are formed by tilting ofBO6octahedra, distortions caused by the cooperative Jahn–Teller effect and other physical effects. Some deri

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25

Durkin, Kathleen Anne, Richard Francis Langler, and Nancy Ann Morrison. "Sulfonyl esters 1: The reduction of tribromophenyl sulfonates with mercaptide anions." Canadian Journal of Chemistry 66, no. 12 (1988): 3070–76. http://dx.doi.org/10.1139/v88-475.

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2,4,6-Tribromophenyl sulfonates have been shown to undergo unusually efficient reduction by mercaptide anions in hexamethylphosphoramide. The reduction products include the sulfinate anion derived from the sulfonate ester and the disulfide derived from the mercaptide anions.

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26

Zaleskaya, Marta, Łukasz Dobrzycki, and Jan Romański. "Highly Efficient, Tripodal Ion-Pair Receptors for Switching Selectivity between Acetates and Sulfates Using Solid–Liquid and Liquid–Liquid Extractions." International Journal of Molecular Sciences 21, no. 24 (2020): 9465. http://dx.doi.org/10.3390/ijms21249465.

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A tripodal, squaramide-based ion-pair receptor 1 was synthesized in a modular fashion, and 1H NMR and UV-vis studies revealed its ability to interact more efficiently with anions with the assistance of cations. The reference tripodal anion receptor 2, lacking a crown ether unit, was found to lose the enhancement in anion binding induced by presence of cations. Besides the ability to bind anions in enhanced manner by the “single armed” ion-pair receptor 3, the lack of multiple and prearranged binding sites resulted in its much lower affinity towards anions than in the case of tripodal receptors

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27

Brown, J. C., R. K. Packer, and M. A. Knepper. "Role of organic anions in renal response to dietary acid and base loads." American Journal of Physiology-Renal Physiology 257, no. 2 (1989): F170—F176. http://dx.doi.org/10.1152/ajprenal.1989.257.2.f170.

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Bicarbonate is formed when organic anions are oxidized systemically. Therefore, changes in organic anion excretion can affect systemic acid-base balance. To assess the role of organic anions in urinary acid-base excretion, we measured urinary excretion in control rats, NaHCO3-loaded rats, and NH4Cl-loaded rats. Total organic anions were measured by the titration method of Van Slyke. As expected, NaHCO3 loading increased urine pH and decreased net acid excretion (NH4+ + titratable acid - HCO3-), whereas NH4Cl loading had the opposite effect. Organic anion excretion was increased in response to

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28

Marin, B. P., and X. Gidrol. "Chloride-ion stimulation of the tonoplast H+-translocating ATPase from Hevea brasiliensis (rubber tree) latex. A dual mechanism." Biochemical Journal 226, no. 1 (1985): 85–94. http://dx.doi.org/10.1042/bj2260085.

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The effect of Cl- and other anions on the tonoplast H+-translocating ATPase (H+-ATPase) from Hevea brasiliensis (rubber tree) latex was investigated. Cl- and other anions stimulated the ATPase activity of tightly sealed vesicles prepared from Hevea tonoplast, with the following decreasing order of effectiveness: Cl- greater than Br- greater than SO4(2-) greater than NO3-. As indicated by the changes of the protonmotive potential difference, anion stimulation of tonoplast H+-ATPase was caused in part by the ability of these anions to dissipate the electrical potential. This interpretation assum

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29

Jarjis, Hayfa M., and Salim M. Khalil. "MINDO-Forces Study of Phenyl and Cyclopropyl Substituted Allyl Cations and Anions." Zeitschrift für Naturforschung A 42, no. 3 (1987): 297–304. http://dx.doi.org/10.1515/zna-1987-0317.

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MINDO-force calculations have been performed on phenyl and cyclopropyl substituted allyl cations and anions with complete energy minimization. It is found that the phenyl ring destabilizes the allyl cations when substituted at the terminal and at the center carbon atom of the cation, while the cyclopropyl ring stabilizes the allyl cation when substituted at the terminal carbon atoms, but destabilizes the cation when substituted at the center carbon atom of the cation. These results agree with the experimental ones. In the case of the allyl anions, it is found that the phenyl ring destabilizes

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30

Stafström, Sven. "GEOMETRICAL AND ELECTRONIC STRUCTURE OF C60 ANIONS." International Journal of Modern Physics B 06, no. 23n24 (1992): 3853–58. http://dx.doi.org/10.1142/s0217979292001924.

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The geometrical and electronic structure of various C 60 anions is calculated using a model which couples the bond length to the bond order and to Coulomb interactions between adjacent sites. The total energy of the C 60 anions is minimized with respect to variations in the bond length. The geometrical relaxations of the anions, relative to the neutral molecule, are such that the symmetry of the molecule is lowered (Jahn-Teller distortion). In the case of the mono-anion and the di-anion, the geometrical distortions and the charge are localized to one equatorial line around the spherical molecu

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31

Zhou, Benhua, and Hongxia Liu. "Tetrakis(4-chloroanilinium) hexachloridostannate(IV) dichloride." Acta Crystallographica Section E Structure Reports Online 68, no. 6 (2012): m782. http://dx.doi.org/10.1107/s1600536812021666.

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The asymmetric unit of the title compound, (C6H7ClN)4[SnCl6]Cl2, comprises two 4-chloroanilinium cations, half of an [SnCl6]2− anion and a Cl− anion. The SnIV atom, located on a special position on a twofold rotation axis, exhibits an octahedral environment. In the crystal, molecules are linked by N—H...Cl hydrogen bonds between the 4-chloroanilinium cations, [SnCl6]2− anions and Cl− anions.

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32

Pitchay*, Dharmalingam S., Jonathan M. Frantz, and James C. Locke. "Anion Species in Fertilizers Affect Growth and Development in Bedding Plants." HortScience 39, no. 4 (2004): 776E—777. http://dx.doi.org/10.21273/hortsci.39.4.776e.

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Currently, formulation of inorganic fertilizers is based on cation amounts such as NH4, K, Mg, Ca, Fe, MN Cu, and Zn, whereas anion species and amounts are viewed, with few exceptions, as necessary fillers. The delivery of cations in the nutrient solution is associated with an anion such as Cl, SO4, NO3, PO4 or CO3. These anions at higher concentrations can result in different growth responses by altering the rhizosphere pH, soluble salts, and influencing the uptake of both cations and anions. The impact of these anions has not been extensively studied in the formulation of inorganic fertilize

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Qi, Ting, Zhen-Bing Si, Li-Juan Liu, et al. "Mechanistic study of cellobiose conversion to 5-hydroxymethylfurfural catalyzed by a Brønsted acid with counteranions in an aqueous solution." Physical Chemistry Chemical Physics 22, no. 17 (2020): 9349–61. http://dx.doi.org/10.1039/c9cp06944e.

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In the cellobiose conversion to HMF catalyzed by Brønsted acid, the halide anions (Cl<sup>−</sup> and Br<sup>−</sup>) act as promoters, whereas both NO<sub>3</sub><sup>−</sup> anion and the carboxylate-containing anions behave as inhibiters.

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Edwards, Nicola. "Fluorescent sensors for detecting anions." Open Access Government 43, no. 1 (2024): 232–33. http://dx.doi.org/10.56367/oag-043-11152.

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Fluorescent sensors for detecting anions Nicola Edwards, Associate Professor of Chemistry at the University of St. Joseph, is conducting research on the development of fluorescent sensors for anion detection. Fluorescent (chemo)sensors are molecules that register changes in their “glow” (fluorescence ) when bound to an analyte (the substance of interest that is being studied), thus reporting the presence of that analyte. These changes can be detected with the naked eye. and/or instrumentation. Therefore, the presence of this invisible substance can now be detected. Fluorescent sensors are gene

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35

Keshavarzi, Ezat, and Mahsa Abareghi. "The Effect of Stern Layer Thickness on the Diffuse Capacitance for Size Asymmetric Electrolyte inside the Charged Spherical Cavities by Density Functional Theory." Journal of The Electrochemical Society 169, no. 2 (2022): 020547. http://dx.doi.org/10.1149/1945-7111/ac52fe.

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The Modified Fundamental Measure Theory was used within the Primitive Model to determine Stern layer thickness in charged spherical cavity. The different behaviors for mean electric potential in Stern region with those one in the diffuse region was considered as the best criteria to determine this thickness. Depending on concentration, ion charge and size, and cavity charge the cations or anions may be found at the closest distance from the cavity’s wall, which lead two values for Stern thickness. In the present case study in which anions are assumed to be larger than cations, at zero or low p

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Shafei, Gamal M. S. El, and Christine A. Philip. "Solid Acids from Persulphated and Perchlorated Physical Mixtures of Zirconium and Titanium Hydroxides." Adsorption Science & Technology 20, no. 10 (2002): 977–93. http://dx.doi.org/10.1260/026361702321705267.

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Calcination at 650°C of a physical mixture of zirconium and titanium hydroxides led to the formation of the corresponding oxides, monoclinic zirconia and anatase. The adsorption of perchlorate or persulphate anions (as 0.05, 0.1, 0.2 or 0.4 M aqueous solutions) before calcination did not inhibit crystallization; however, perchlorate anions activated the formation of rutile in addition to the predominant anatase phase. Indeed, the adsorption of perchlorated anions prior to calcination allowed the thermodynamically less stable tetragonal phase of zirconia to be detected in addition to monoclinic

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Yuliana, Ruth Yabansabra, Tenem Chemistry Emiliana, Sriyanto, and Asmuruf Frans. "Analysis of Mineral Salt from Daemonorops rebustus." INTERNATIONAL JOURNAL OF PHARMACEUTICAL AND BIO-MEDICAL SCIENCE 04, no. 07 (2024): 637–42. https://doi.org/10.5281/zenodo.12804303.

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Rattan (<em>Daemonorops rebustus</em>) is widely used as salt or flavoring traditionally. However, research on the mineral (anions and cations) of the ash of the rattan plant has never been reported. The purpose of this study is to determine the mineral content (anions and cations dissolved in water) contained in the rattan leaf ash by qualitative and quantitative analysis methods. The method used was the collection of lambing rattan samples in Boven Digoel  district, preliminary tests of cations and anions, and then testing of cation/anion contretation from rattan. The results obtained s

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Flood, Amar H. "Creating molecular macrocycles for anion recognition." Beilstein Journal of Organic Chemistry 12 (March 31, 2016): 611–27. http://dx.doi.org/10.3762/bjoc.12.60.

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The creation and functionality of new classes of macrocycles that are shape persistent and can bind anions is described. The genesis of triazolophane macrocycles emerges out of activity surrounding 1,2,3-triazoles made using click chemistry; and the same triazoles are responsible for anion capture. Mistakes made and lessons learnt in anion recognition provide deeper understanding that, together with theory, now provides for computer-aided receptor design. The lessons are acted upon in the creation of two new macrocycles. First, cyanostars are larger and like to capture large anions. Second is

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Liu, Shang Lin, Qing Shan Li, and Wen Feng Lv. "Measuring Air Anion Concentration and Researching Development of Forest Health Tourism in Riyuexia National Forest Park." Applied Mechanics and Materials 320 (May 2013): 743–47. http://dx.doi.org/10.4028/www.scientific.net/amm.320.743.

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In this paper, air Anions functions such as cleaning air, resisting bacteria, health care and the seven evaluation criteria system of the air anions concentration were introduced. Air Anion Concentration of Riyuexia National Forest Park in Heilongjiang province was Measured and analyzed. After comparing the result of 10 samples to the Anions evaluation system we can see that the air quality of Riyuexia National Forest Park is very fresh, it helps to health and is fit for some ecotourism activities such as health preservation of forest and fresh air bath. The paper proposes that we should prese

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Zhang, Jian-Feng, Bo Wan, Wen Liu та Qian Shi. "Diaquadi-μ-formato-bis{μ-2,2′-[propane-1,3-diylbis(nitrilomethanylylidene)]diphenolato}cadmium(II)dinickel(II) dihydrate". Acta Crystallographica Section E Structure Reports Online 68, № 8 (2012): m1122—m1123. http://dx.doi.org/10.1107/s1600536812029583.

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In the centrosymmetric title compound, [CdNi2(C17H16N2O2)2(HCOO)2(H2O)2]·2H2O, The NiIIcation is chelated by a 2,2′-[propane-1,3-diylbis(nitrilomethanylylidene)]diphenolate (salpn) anion, and further coordinated by a formate anion and a water molecule in a distorted NiN2O4octahedral geometry. The CdIIcation, located on an inversion center, is coordinated by four deprotonated hydroxy groups from two salpn anions and two carboxylate O atoms from formate anions in a distorted octahedral geometry. Both formate and salpn anions bridge the Cd and Ni cations, forming a trinuclear complex. Within the

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Wang, Huali, Sichen Gu, Ying Bai, et al. "Anion-effects on electrochemical properties of ionic liquid electrolytes for rechargeable aluminum batteries." Journal of Materials Chemistry A 3, no. 45 (2015): 22677–86. http://dx.doi.org/10.1039/c5ta06187c.

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Anion-effects are embodied in: (1) halogen anions resulting from different halogenated imidazole salt species, which is the critical factor for electrochemical windows; (2) aluminum chloride anions resulting from different AlCl<sub>3</sub>/imidazole salt mole ratios, which is the determinant of electrochemical activities.

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Siegel, Marshall M., and Norman B. Colthup. "Molecular Orbital Study of Remote Charge Site Decompositions in the Collision-Induced Decomposition Mass Spectra of Fatty Acid Carboxylate Anions." Applied Spectroscopy 42, no. 7 (1988): 1214–21. http://dx.doi.org/10.1366/0003702884429887.

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Molecular orbital calculations were used to study the energetics of four different mechanisms used to explain the collision-induced decomposition mass spectra of saturated fatty acid carboxylate anions produced by fast atom bombardment and chemical ionization. The most abundant homologous series of anions, terminally unsaturated carboxylate anions, arose from the concerted cleavage of gauche segments of the hydrocarbon backbone via a sixatom transition state. A series of anions of lower abundance arose by homolytic cleavage of anti segments of the hydrocarbon backbone into two radical fragment

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Tamao, Kohei, Atsushi Kawachi, Yoko Tanaka, Hitoshi Ohtani, and Yoshihiko Ito. "Synthetic applications of functionalized silyl anions: Aminosilyl anions as hydroxy anion equivalent." Tetrahedron 52, no. 16 (1996): 5765–72. http://dx.doi.org/10.1016/0040-4020(96)00212-8.

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Bull, James N., Christopher W. West, and Jan R. R. Verlet. "On the formation of anions: frequency-, angle-, and time-resolved photoelectron imaging of the menadione radical anion." Chemical Science 6, no. 2 (2015): 1578–89. http://dx.doi.org/10.1039/c4sc03491k.

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Frequency-, angle-, and time-resolved photoelectron imaging of gas-phase menadione (vitamin K<sub>3</sub>) radical anions is used to show that quasi-bound resonances of the anion can act as efficient doorway states to produce metastable ground electronic state anions on a sub-picosecond timescale.

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Mair, Sunil, Jeffrey Smith, Donald J. Siegel, W. Craig Carter, and Yet-Ming Chiang. "Rotational Behavior Analysis of Cluster Anions in Solid-State Electrolytes via MD Simulation." ECS Meeting Abstracts MA2024-02, no. 8 (2024): 1055. https://doi.org/10.1149/ma2024-0281055mtgabs.

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Solid-state batteries (SSBs) have the potential to bring about dramatic increases in safety and performance compared to current liquid electrolyte systems, allowing for electrification of crucial sectors such as transportation as well as development of novel device architectures for consumer electronics. Finding a suitable solid-state electrolyte remains a key challenge in the path to realization of SSBs, and finding candidate materials that exhibit sufficient ionic conductivity alongside the many other materials properties required of a solid-state electrolyte is the crux of this challenge. W

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Noushija, Mannanthara Kunhumon, Ananthu Shanmughan, Binduja Mohan, and Sankarasekaran Shanmugaraju. "Selective Recognition and Reversible “Turn-Off” Fluorescence Sensing of Acetate (CH3COO−) Anion at Ppb Level Using a Simple Quinizarin Fluorescent Dye." Chemistry 4, no. 4 (2022): 1407–16. http://dx.doi.org/10.3390/chemistry4040092.

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A simple and cost-effective optical sensing system based on quinizarin fluorescent dye (QZ) for the selective and reversible sensing of CH3COO− anions is reported. The anion binding affinity of QZ towards different anions was monitored using electronic absorption and fluorescence emission titration studies in DMSO. The UV-visible absorption spectrum of QZ showed a decrease in the intensity of the characteristic absorption peaks at λ = 280, 323, and 475 nm, while a new peak appeared at λ = 586 nm after the addition of CH3COO− anions. Similarly, the initial strong emission intensity of QZ was at

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Ren, Xiaoming, and Peter G. Pickup. "Ion–polymer interactions in polypyrrole films." Canadian Journal of Chemistry 75, no. 11 (1997): 1518–22. http://dx.doi.org/10.1139/v97-182.

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Formal potentials from cyclic voltammetry and ionic conductivities from impedance measurements are used to probe anion–polymer interactions in electrochemically deposited films of polypyrrole. Hard anions (F−, Cl−, ClO4−) stabilize the oxidized form of the polymer more than soft anions (I−, SCN−). Anions of weak acids (F− and CN−) interact with the polymer particularly strongly and exhibit anomalously low mobilities. Hydrogen bonding with the N-H groups of oxidized polypyrrole is proposed. Keywords: conducting polymer, polypyrrole, impedance, ion transport, electrolyte effects, ion exchange.

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Yadav, Monalisa, Hong Fang, Santanab Giri, and Puru Jena. "Ligand stabilization of manganocene dianions – in defiance of the 18-electron rule." Physical Chemistry Chemical Physics 21, no. 44 (2019): 24300–24307. http://dx.doi.org/10.1039/c9cp02331c.

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Di-anions of manganocene derivatives complexes, in spite of being a 19-electron system, are found to be more stable than their mono-anions. This defiance of the 18-electron rule is linked to the geometrical distortion of the di-anion, akin to the Jahn-Teller-like mechanism.

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Ngatijo, Ngatijo, Diah Riski Gusti, Abdurrazaq Habib Fadhilah, and Resilta Khairunnisah. "Adsorben Magnetit Terlapis Dimerkaptosilika untuk Adsorpsi Anion Logam [AuCl4]- dan [Cr2O7]-." Jurnal Riset Kimia 11, no. 2 (2020): 113–20. http://dx.doi.org/10.25077/jrk.v11i2.353.

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Adsorbent magnetite-dimercapto-silica (Fe3O4 - DMS) is a synthesis of magnetite with 2,3-dimercapto-1-propanol which has been applied to adsorb anions [AuCl4] - and [Cr2O7]-2. The adsorption process of metal anion [AuCl4]- at pH 5 with a contact time of 100 minutes was found optimum results at an adsorption capacity of 77.58 mg/g and an adsorption efficiency value of 96.975%. While the optimum conditions of metal anion [Cr2O7]-2 after the adsorption process at pH 4 with a contact time of 90 minutes was found an adsorption capacity of 85.0426 mg/g and an adsorption efficiency value of 85.0426%.

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Makuc, Damjan, Jennifer R. Hiscock, Mark E. Light, Philip A. Gale, and Janez Plavec. "NMR studies of anion-induced conformational changes in diindolylureas and diindolylthioureas." Beilstein Journal of Organic Chemistry 7 (September 2, 2011): 1205–14. http://dx.doi.org/10.3762/bjoc.7.140.

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The conformational properties of 1,3-diindolylureas and thioureas were studied by a combination of heteronuclear NMR spectroscopy and quantum mechanics calculations. NOE experiments showed that the anti–anti conformer along the C7–N7α bonds was predominant in DMSO-d 6 solution in the absence of anions. Anion-induced changes in the 1H and 15N chemical shifts confirm the weak binding of chloride anions with negligible conformational changes. Strong deshielding of ureido protons and moderate deshielding of indole NH was observed upon the addition of acetate, benzoate, bicarbonate and dihydrogen p

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