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Journal articles on the topic 'Potassium compounds'

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Published: 4 June 2021

Last updated: 4 March 2023

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1

Li, Guiying, Thaesong Kim, Runxia Huang, Dingyuan Hu, Shucong Shi, and Han Wang. "Synthesis, anti-inflammatory and analgesia activities of diclofenac and their derivatives." Materials Express 12, no. 6 (June 1, 2022): 865–70. http://dx.doi.org/10.1166/mex.2022.2209.

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Diclofenac potassium was synthesized from aniline and chloroacetyl chloride. The reaction of diclofenac potassium with calcium sulphate dihydrate and ammonium sulphate yielded diclofenac calcium and diclofenac ammonium, respectively. After diclofenac potassium was acidized with hydrochloride, the esterification of attained diclofenac with absolute methanol and absolute ethanol yielded compounds diclofenac methyl ester and diclofenac ethyl ester, respectively. Among the five compounds, diclofenac calcium and diclofenac ammonium are new compounds, and their synthetic methods have not been reported in the world. Every synthesized compound and intermediate were measured their 1H-NMR, 13C-NMR spectra. Analgesic activity of the target compounds was screened using acetic acid writhing test of mice and anti-inflammatory activity of the compounds was tested by xylene-induced ear swelling of mice. The results showed that all the 5 compounds had strong analgesic activity and anti-inflammatory activity. Among them, diclofenac methyl ester is the strongest, its analgesic and anti-inflammatory effects were stronger than the clinical use of diclofenac potassium.

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2

Kayser, Christian, Roland Fischer, Judith Baumgartner, and Christoph Marschner. "Tailor-made Oligosilyl Potassium Compounds." Organometallics 21, no. 6 (March 2002): 1023–30. http://dx.doi.org/10.1021/om010815w.

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3

Mordkovich, V. Z., Y. Ohki, S. Yoshimura, S. Hino, T. Yamashita, and T. Enoki. "Potassium-oxygen graphite intercalation compounds." Synthetic Metals 68, no. 1 (December 1994): 79–83. http://dx.doi.org/10.1016/0379-6779(94)90150-3.

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4

Cemeli, Eduard, Ricard Marcos, and Diana Anderson. "Genotoxic and antigenotoxic properties of selenium compounds in thein vitromicronucleus assay with human whole blood lymphocytes and tk6 lymphoblastoid cells." Scientific World JOURNAL 6 (2006): 1202–10. http://dx.doi.org/10.1100/tsw.2006.204.

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Selenium is known to possess both genotoxic and antigenotoxic properties. In the present study, we have evaluated the genotoxicity and antigenotoxicity of three selenium compounds (sodium selenate, sodium selenite and selenous acid) by measuring in vitro micronucleus induction. Assays were conducted in whole blood lymphocytes and in the TK6 lymphoblastoid cell line, with and without co-treatment with potassium dichromate, a known genotoxic compound. In general, the compounds were more active in TK6 cells than they were in blood lymphocytes. Only 1 μM selenous acid increased the frequency of binucleated cells containing micronuclei (BNMN) in blood lymphocytes, while all three selenium compounds increased BNMN in TK6 cells. In addition, combinations of selenous acid and potassium dichromate resulted in lower frequencies of BNMN than potassium dichromate alone in blood lymphocytes, while combinations of sodium selenate and potassium dichromate produced lower frequencies of BNMN than potassium dichromate alone in TK6 cells. The concentrations of selenium compounds that were used, in combination with the medium components and the biological physiology of the whole blood lymphocytes and TK6 cells, could have affected the redox potential of the compounds, switching the chemicals from a pro-oxidant to antioxidant status and vice-versa. The lower activities of the compounds in blood lymphocytes may be due to the protective effects of blood components. The results indicate that the genotoxic and antigenotoxic properties of selenium compounds are highly dependent upon the conditions under which they are evaluated.

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5

Savchenkov, Anton V., Anna V. Vologzhanina, Larisa B. Serezhkina, Denis V. Pushkin, and Viktor N. Serezhkin. "The first uranyl complexes with valerate ions." Acta Crystallographica Section C Crystal Structure Communications 69, no. 7 (June 13, 2013): 721–26. http://dx.doi.org/10.1107/s0108270113014832.

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FT–IR spectroscopy and single-crystal X-ray structure analysis were used to characterize the discrete neutral compound diaquadioxidobis(n-valerato-κ2O,O′)uranium(VI), [UO2(C4H9COO)2(H2O)2], (I), and the ionic compound potassium dioxidotris(n-valerato-κ2O,O′)uranium(VI), K[UO2(C4H9COO)3], (II). The UVIcation in neutral (I) is at a site of 2/msymmetry. Potassium salt (II) has two U centres and two K+cations residing on twofold axes, while a third independent formula unit is on a general position. The ligands in both compounds were found to suffer severe disorder. The FT–IR spectroscopic results agree with the X-ray data. The composition and structure of the ionic potassium uranyl valerate are similar to those of previously reported potassium uranyl complexes with acetate, propionate and butyrate ligands. Progressive lengthening of the alkyl groups in these otherwise similar compounds was found to have an impact on their structures, including on the number of independent U and K+sites, on the coordination modes of some of the K+centres and on the minimum distances between U atoms. The evolution of the KUO6frameworks in the four homologous compounds is analysed in detail, revealing a new example of three-dimensional topological isomerism in coordination compounds of UVI.

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6

Atou, T., M. Hasegawa, L. J. Parker, and J. V. Badding. "Unusual Chemical Behavior for Potassium under Pressure: Potassium−Silver Compounds." Journal of the American Chemical Society 118, no. 48 (January 1996): 12104–8. http://dx.doi.org/10.1021/ja9627003.

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7

Schollmeier, Thorsten, Ulrich Englich, Roland Fischer, Ingo Prass, Karin Ruhlandt, Markus Schürmann, and Frank Uhlig. "Synthesis and Reactivity of Novel Alkali Metal Stannides." Zeitschrift für Naturforschung B 59, no. 11-12 (December 1, 2004): 1462–70. http://dx.doi.org/10.1515/znb-2004-11-1215.

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Reactivity and side products of reactions of diorganodihydridostannanes (R2SnH2, R = Me, nBu, tBu)) with various alkali metal compounds have been discussed. Alternatively, the synthesis and characterization of a family of novel potassium stannides are described as well. The compounds of type (RR’2Si)R”2SnK (R, R’= Me, Ph; R”= , Me, tBu, Ph) 4 - 9 were synthesized by reaction of potassium hydride with bis(silyl)stannides ((RR’2Si)2SnR”2). All compounds were characterized by multinuclear NMR spectroscopy. In addition, the tri-tert-butyltin compound 3 (LiSntBu3) and the unsymmetrical silyl substituted stannane 10 were characterized by X-ray crystallography.

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8

Dhol, S. R., P. M. Gami, R. C. Khunt, and A. R. Parikh. "Design, Synthesis and Characterization of Novel Arylamides Containing 1,2,4-triazole Nuclei for Possible Antimicrobial Activity." E-Journal of Chemistry 1, no. 5 (2004): 228–30. http://dx.doi.org/10.1155/2004/240397.

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Diphenyl aceto hydrazide on reaction with carbon disulfide and potassium hydroxide gave potassiumα,α-diphenyl acetamido dithiocarbamate, which on cyclisation with hydrazine hydrate yielded key intermediate 3-mercapto-4,N-amino-5-benzhydryl-1,2,4-triazoles. The key intermediate on condensation with different acid chloride afforded our titled compounds. The synthesised compounds have been confirmed elemental analyses and further supported by spectral data. All the synthesised compounds have been evaluated for theirin vitroin vitro antimicrobial activity.

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9

Shaabani, Ahmad, Farahnaz Tavasoli‐Rad, and Donald G. Lee. "Potassium Permanganate Oxidation of Organic Compounds." Synthetic Communications 35, no. 4 (March 2005): 571–80. http://dx.doi.org/10.1081/scc-200049792.

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10

Babushok, Valeri I., Gregory T. Linteris, Pol Hoorelbeke, Dirk Roosendans, and Kees van Wingerden. "Flame Inhibition by Potassium-Containing Compounds." Combustion Science and Technology 189, no. 12 (August 9, 2017): 2039–55. http://dx.doi.org/10.1080/00102202.2017.1347162.

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11

Hosaka, Tomooki, Tomoaki Shimamura, Kei Kubota, and Shinichi Komaba. "Polyanionic Compounds for Potassium‐Ion Batteries." Chemical Record 19, no. 4 (October 30, 2018): 735–45. http://dx.doi.org/10.1002/tcr.201800143.

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12

Harrison, William T. A., and James L. Wardell. "Crystal structures of potassium trifluorido(4-methoxyphenyl)borate and potassium trifluorido(4-fluorophenyl)borate." Acta Crystallographica Section E Structure Reports Online 70, no. 8 (July 19, 2014): 68–71. http://dx.doi.org/10.1107/s1600536814009684.

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The title compounds, K+·C7H7BF3O−, (I), and K+·C6H4BF4−, (II), are molecular salts containingpara-substituted phenyltrifluoridoborate anions. In each compound, the B atom adopts a distorted tetrahedral BCF3geometry. Despite their different compositions and space groups, the irregular KF8coordination polyhedra of the potassium cations in the structures are almost identical. These polyhedra share faces and edges, generating infinite (010) layers in (I) and infinite (001) layers in (II). In (I), adjacent layers are stacked in anAAA… fashion, whereas in (II), they are stacked in anABAB… sequence.

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13

Rádl, Stanislav, Lenka Kovářová, and Jiří Holoubek. "Synthesis and antibacterial activity of some 1-(2-propynyl) and 1-propadienyl derivatives of 1,4-dihydro-4-oxoquinoline-3-carboxylic acids and similar heterocycles." Collection of Czechoslovak Chemical Communications 56, no. 2 (1991): 439–48. http://dx.doi.org/10.1135/cccc19910439.

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N-Alkylation of IIIa, IIIb, IIId - IIIf and 9-acridanone with 3-bromopropyne in dimethyl sulfoxide in the presence of potassium carbonate yielded N-(2-propynyl) derivatives IVa - IVe and VIa, respectively. Ethyl esters IVa, IVb, and IVe were hydrolyzed to IVf - IVh, respectively. Compounds IVf, IVg, IVctreated with bases yielded N-propadienyl derivatives Va - Vc. On the other hand 2-substituted compounds IVd and IVh did not change under the same conditions. Compound VIa treated with powdered potassium hydroxide in dimethyl sulfoxide at room temperature yielded N-(1-propynyl) derivative VII.

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14

Kondo, Mitsuyo, Makiko Kawamoto, Atsushi Hasuoka, Masahiro Kajino, Nobuhiro Inatomi, and Naoki Tarui. "High-Throughput Screening of Potassium-Competitive Acid Blockers." Journal of Biomolecular Screening 17, no. 2 (September 22, 2011): 177–82. http://dx.doi.org/10.1177/1087057111421004.

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H+,K+-ATPase is a key enzyme in the process of gastric acid secretion, and proton pump inhibitors (PPIs) have been accepted as one of the most effective treatments for peptic ulcer and gastroesophageal reflux disease. To discover a novel class of PPIs, the authors screened a low-molecular-weight compound library and identified two prospective acid blockers that were pyrrole derivatives. Both compounds inhibited H+,K+-ATPase in a reversible and potassium-competitive manner. These compounds led to the development of TAK-438 (1-[5-(2-fluorophenyl)-1-(pyridin-3-ylsulfonyl)-1H-pyrrol-3-yl]-N-methylmethanamine monofumarate), which is currently undergoing clinical trials as a novel potassium-competitive acid blocker for the treatment of acid-related diseases.

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15

Alheety, Nuaman. "Synthesis, Characterization and Antimicrobial Activity Study of Some New Substituted Benzoxazole Derivatives." Baghdad Science Journal 16, no. 3 (September 1, 2019): 616. http://dx.doi.org/10.21123/bsj.2019.16.3.616.

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This research included the preparation of 2-mercaptobenzoxazole (N1) by the reaction of ortho-aminophenol with carbon disulfide in an alcoholic potassium hydroxide solution. The 2-mercapto benzoxazole (N1) was then treated with hydrazine to obtain the 2-hydrazino benzoxazole (N2). A number of hydrazones (N3-N5) were prepared through the reaction of N2 with different benzaldehydes. The compound (N6) was also prepared whereby the ring closing of hydrazone (N3) using chloroacetylchloride, while the compound (N7) was prepared by treating 2-hydrazino benzoxazole with acetylacetone. When the compound (N1) was treated with formaldehyde, it afforded the compound (N8). Also, the N9 was obtained from the reaction of N1 with chloroacetic acid in the presence of alcoholic potassium hydroxide. The prepared compounds were characterized using physico-chemical and spectroscopic methods such as melting point, infrared spectroscopy (IR) and the proton nuclear magnetic resonance (1H-NMR). Thereafter, some of the compounds were selected for in vitro antibacterial activity and one of these compounds showed an inhibition effect against gram positive only which is very important because it is considered as specific antibacterial drug.

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16

Anteh, J. D., O. A. Timofeeva, and A. A. Mostyakova. "Effect of potassium humate and growth stage on phenolic compound and vitamin C accumulation in kale (Brassica oleracea var. sabellica)." IOP Conference Series: Earth and Environmental Science 941, no. 1 (November 1, 2021): 012032. http://dx.doi.org/10.1088/1755-1315/941/1/012032.

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Abstract Kale is one of the top economically valuable crops in the world because of its high antioxidant content. Research shows that the antioxidant profile of Brassica crops varies with growth stages due to soil fertility, temperature, light and other agronomic factors. This study aimed to analyze the effect of potassium humate on phenolic compound content, the greatest contributor to the antioxidant properties of the highest-ranking superfood kale (Brassica oleracea var. sabellica). Our results showed that potassium humate at different growth stages elicited phenolic compounds in the studied samples. Leaves of 22 weeks old plants accumulated phenolic compounds about two times higher than those of 7 weeks old plants. Vitamin C content was increased by potassium humate treatment at 7 weeks. At 22 weeks levels in controls and treated kale leaves did not significantly differ.

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17

Wang, Qing Kun, Shao Ping Pu, Yong Nian Li, Jian He, Jie Jin, and Qi Zhang. "Synthesis, Characterization and Antitumor Activities of Platinum(II) Complexes." Advanced Materials Research 803 (September 2013): 145–48. http://dx.doi.org/10.4028/www.scientific.net/amr.803.145.

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In order to obtain the mixed isobutylamine /cyclopentylamine platinum complexes with chloride and oxalic acid ions as leaving groups. The title compounds were synthetised from potassiumtetrachloroplatinate(II) by the reaction with potassium iodide, cyclopentylamine, isobutylamine, silver nitrate, potassium chloride, potassium oxalate monohydrate. The complexes structure and component were characterized by elemental analysis, ESI-MS, 1H-NMR and IR and the anticancer activity were measured by MTT method. The results showed that its structure was consistent with the title compound and had inhibiting effect on the growth of tumor cell lines in vitro.

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18

Hérold, Claire, Frédérique Goutfer-Wurmser, Jean-François Marěché, and Philippe Lagrange. "New Graphite Intercalation Compounds : The Potassium Pnictographitides." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 310, no. 1 (February 1998): 57–62. http://dx.doi.org/10.1080/10587259808045314.

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19

Wolski, E. P., O. V. Zharikov, A. V. Palnichenko, V. V. Avdeev, V. Z. Mordkovich, and K. N. Semenenko. "Superconductivity of the potassium graphite intercalation compounds." Solid State Communications 57, no. 6 (February 1986): 421–23. http://dx.doi.org/10.1016/0038-1098(86)90482-5.

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20

Kitakizaki, K., Y. Asano, and T. Tamura. "Denitration agents containing zeolites and potassium compounds." Zeolites 15, no. 8 (November 1995): 756. http://dx.doi.org/10.1016/0144-2449(95)96854-t.

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21

Reghai, Lotfi, and Herve Fuzellier. "Reaction of Ammonia with Graphite-Potassium Compounds." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 244, no. 1 (April 1994): 47–52. http://dx.doi.org/10.1080/10587259408050081.

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22

Chawla, K. L., N. L. Misra, and N. C. Jayadevan. "M2U4O12 compounds of potassium, rubidium and thallium." Journal of Nuclear Materials 154, no. 2-3 (July 1988): 181–85. http://dx.doi.org/10.1016/0022-3115(88)90353-4.

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23

Eren Belgin, E., and G. A. Aycik. "Potassium compounds for gamma spectrometer efficiency verification." Applied Radiation and Isotopes 125 (July 2017): 30–33. http://dx.doi.org/10.1016/j.apradiso.2017.04.004.

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24

MORDKOVICH, V. Z., Y. OHKI, S. YOSHIMURA, S. HINO, T. YAMASHITA, and T. ENOKI. "ChemInform Abstract: Potassium-Oxygen Graphite Intercalation Compounds." ChemInform 26, no. 16 (April 18, 1995): no. http://dx.doi.org/10.1002/chin.199516015.

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25

Oh, Won-Chun, Sung-Jun Cho, and Young-Shin Ko. "The stability of potassium-graphite deintercalation compounds." Carbon 34, no. 2 (1996): 209–15. http://dx.doi.org/10.1016/0008-6223(96)00178-9.

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26

İla, Sibel, Azmi Seyhun Kipcak, and Emek Moroydor Derun. "A new rapid synthesis of potassium borates by microwave irradiation." Main Group Chemistry 19, no. 4 (January 23, 2021): 265–72. http://dx.doi.org/10.3233/mgc-200956.

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Potassium borates are one of the minor groups of boron minerals with its distinct non-linear optical properties. In this study, potassium borate compound of santite (KB5O8·4H2O) are synthesized using potassium carbonate (K2CO3) and boric acid (H3BO3) with a new and rapid method of microwave irradiation. The synthesized minerals are characterized by various analysis techniques of X-ray diffraction (XRD), Raman spectroscopy and scanning electron microscope (SEM). Three parameters of “microwave power level”, “reaction times” and “reaction stoichiometric constants (elemental potassium to boron ratios)” are determined for the optimum synthesis of potassium borate within the four step. At the end of the step 4, optimum products are obtained as santite type potassium borate. Synthesized potassium borates Raman bands are in mutual agreement with the boron compounds and the overall reaction yields to potassium borates are very high compared with the lower reaction times.

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27

Zhilin, Egor S., Dmitry B. Meerov, and Leonid L. Fershtat. "Potassium (3-Methyl-2-oxido-1,2,5-oxadiazol-4-yl)dinitromethanide." Molbank 2021, no. 4 (November 26, 2021): M1301. http://dx.doi.org/10.3390/m1301.

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Furoxan derivatives enriched with explosophoric functionalities are promising compounds in the preparation of novel energetic materials. Herein, a previously unknown potassium (3-methyl-2-oxido-1,2,5-oxadiazol-4-yl)dinitromethanide (also referred to as potassium 4-dinitromethyl-3-methylfuroxanate) was synthesized via tandem nitration-reduction reactions of an available (furoxanyl)chloroxime. The structure of the synthesized compound was established by elemental analysis, IR, 1H, 13C and 14N NMR spectroscopy. Thermal stability and mechanical sensitivity of the prepared compound toward impact and friction were experimentally determined.

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28

Zheng, Yue Qing, and Arnold Adam. "Komplexe Alkalimetall-carbonat-hydrogencarbonate mit fünffach koordiniertem Zink: NaA2{Zn2[H(CO3)2](CO3)2(H2O)2} mit A = K, Rb / Complex Alkalimetal-carbonates-hydrogencarbonates with Penta-Coordinated Zinc: NaA2{Zn2[H(CO3)2](CO3)2(H2O)2] with A = K, Rb." Zeitschrift für Naturforschung B 50, no. 8 (August 1, 1995): 1185–94. http://dx.doi.org/10.1515/znb-1995-0811.

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The new alkalimetal-hydrogenbis(carbonato)-bis(carbonato)complexes with penta-coordinated zinc atoms, NaA2{Zn2[H(CO3)2](CO3)2(H2O)2} with A = Kor Rb, crystallize in the monoclinic system, P21/n (no. 14), Z = 2 with a = 1057,9(1), b = 1102,2(1), c = 514,9(1) pm, β = 92,94(1)°, VEZ = 599,6(2) · 106 pm3, R = 0,052, Rw = 0,029 for the potassium compound and with a = 1068,2(2), b = 1131,6(4), c = 518,6(1) pm, β = 92,07(1)°, VEZ = 626,4(4)·106 pm3, R = 0,050, Rw = 0,028 for the rubidium compound. These compounds are the first to be structurally characterized with a simultaneous presence of discrete [H(CO3)2]3-and CO32- anions. The crystal structure of the isostructural compounds contains two-dimensional infinite {Zn2[H(CO3)2](CO3)2(H2O)2} layers parallel [1 0 1] with zinc coordinated in a slightly distorted trigonal-bipyramidal geometry. The layers are held together by hydrogen bonds from water molecules to oxygen atoms of the carbonato groups in adjacent layers. Potassium or rubidium atoms are located between the layers, and sodium atoms in smaller vacancies within the layers. The hydrogen bond of the [H(CO3)2]3- anion is very short, O···O: 247,4(2) pm (K) and 246,9(5) pm (Rb). The carbonate groups in both compounds exhibit significant deviations from D3h symmetry in accordance with the vibrational modes observed in the IR spectra. The thermal behaviour of the potassium compound is also reported.

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29

Journal, Baghdad Science. "Synthesis and Characterization of New Fused Heterocyclic Compounds Consisting of Benzodiazepine, Quinoxaline, Benzimidazole and Thiazole Rings." Baghdad Science Journal 5, no. 3 (September 7, 2008): 440–45. http://dx.doi.org/10.21123/bsj.5.3.440-445.

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In this study, new heterocyclic compounds were synthesized through the cyclization reactions of o-phenylenediamine (1) with various organic reagents. Benzodiazepine derivatives (2-4) were obtained by reaction of (1) with ethylacetoacetate, malonic acid and acetyl acetone.Treatment of compound (1) with chloroacetamide, chloroacetic acid, p-bromophenacyl bromide and oxalic acid dihydrate afforded quinoxaline derivatives (5-8), respectively. Reaction of compound (1) with benzoic acid, piperonal, cyclohexanone and carbon disulfide resulted in the formation of compounds (9-12), respectively. Finally, reaction of compound (12) with chloroacetic acid in the presence of potassium hydroxide produced compound (13).

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30

Juršić, Branko. "Surfactant assisted permanganate oxidation of aromatic compounds." Canadian Journal of Chemistry 67, no. 9 (September 1, 1989): 1381–83. http://dx.doi.org/10.1139/v89-211.

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Potassium permanganate in aqueous solutions of surfactant can be used to oxidize aromatic compounds to the corresponding acids. It has been found that oxidation of aromatic alcohols and aldehydes proceeds under mild reaction conditions, while the oxidation of alkylbenzenes requires higher temperatures. The yields are very high and the work-up is simple, which makes oxidation with potassium permanganate a convenient synthetic method. Keywords: surfactant, oxidation, aromatic compounds, catalysis.

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31

Kulikova, Svetlana A., Kseniya Yu Belova, Ekaterina A. Tyupina, and Sergey E. Vinokurov. "Conditioning of Spent Electrolyte Surrogate LiCl-KCl-CsCl Using Magnesium Potassium Phosphate Compound." Energies 13, no. 8 (April 16, 2020): 1963. http://dx.doi.org/10.3390/en13081963.

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The current work was aimed at developing a new conditioning method of spent electrolyte-radioactive waste (RW) generated during the pyrochemical reprocessing of mixed nitride uranium-plutonium spent nuclear fuel. Magnesium potassium phosphate (MPP) compound samples were synthesized under solidification of the electrolyte surrogate solution in a LiCl-KCl-CsCl system. The phase composition and structure of obtained compounds were studied by XRD and SEM-EDS methods. It was found that the compounds possessed a high compressive strength of 17–26 MPa. Hydrolytic stability of the compounds was evaluated in accordance with the long semi-dynamic test GOST R 52126-2003 and with the static PCT test. The 137Cs content in the leached solutions was determined by gamma-ray spectrometry, and other compound components were determined by ICP–AES and ICP–MS methods. The differential leaching rate of Cs at 25 °C from monolithic samples on the 91st day of samples contact with water was 5–11 × 10−5 g/(cm2·day) (GOST R 52126-2003), and was 4–29 × 10−7 g/(cm2∙day) on the 7th day at 90 °C from crushed samples (PCT). The thermal stability of the compound at 180 °C and 450 °C was shown. The characteristics of the obtained MPP compound correspond to the current regulatory requirements for materials for RW conditioning.

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32

Radwan, Fae. "Isotropy of Some Potassium, Sodium and Rubidium Compounds." British Journal of Applied Science & Technology 8, no. 2 (January 10, 2015): 162–64. http://dx.doi.org/10.9734/bjast/2015/12563.

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33

Rech, Amanda B., Angela Kinoshita, Paulo M. Donate, and Oswaldo Baffa. "ESR dosimetry with lithium, potassium, and sodium compounds." Applied Radiation and Isotopes 181 (March 2022): 110105. http://dx.doi.org/10.1016/j.apradiso.2022.110105.

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34

Sugihara, K., T. Enoki, and K. Nakazawa. "Transport Properties of Hydrogen-Potassium-Graphite Intercalation Compounds." Materials Science Forum 91-93 (January 1992): 439–44. http://dx.doi.org/10.4028/www.scientific.net/msf.91-93.439.

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35

Larson, Nicholas R., Paul R. Carlier, Aaron D. Gross, Rafique M. Islam, Ming Ma, Baonan Sun, Maxim M. Totrov, Roopali Yadav, and Jeffrey R. Bloomquist. "Toxicology of potassium channel-directed compounds in mosquitoes." NeuroToxicology 60 (May 2017): 214–23. http://dx.doi.org/10.1016/j.neuro.2016.05.021.

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36

Su, Hui, Jiaying Ju, Jian Zhang, Aifei Yi, Ze Lei, Lina Wang, Zhaowu Zhu, and Tao Qi. "Lithium recovery from lepidolite roasted with potassium compounds." Minerals Engineering 145 (January 2020): 106087. http://dx.doi.org/10.1016/j.mineng.2019.106087.

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37

Taskin, Bahar, Nadia Lybøl von Schoubye, Majid Sheykhzade, Jesper Frank Bastlund, Morten Grunnet, and Thomas Jespersen. "Biophysical characterization of KV3.1 potassium channel activating compounds." European Journal of Pharmacology 758 (July 2015): 164–70. http://dx.doi.org/10.1016/j.ejphar.2015.03.061.

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38

Beifuss, U., D. Schmidt, J. Conrad, and I. Klaiber. "Pyranones from Potassium Salts of Acyclic Tricarbonyl Compounds." Synfacts 2007, no. 2 (February 2007): 0141. http://dx.doi.org/10.1055/s-2006-955833.

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Rummel, Siegbert, Michael Herrmann, Manfred Wahren, Safar M. Yunusov, Margarita A. Ilatovskaya, Yuri B. Isaev, N. D. Lapkina, Yuri N. Novikov, and Vladimir B. Shur. "H-D exchange on graphite–potassium intercalation compounds." Isotopes in Environmental and Health Studies 48, no. 3 (September 2012): 391–92. http://dx.doi.org/10.1080/10256016.2012.705840.

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Rinkenburger, Alexander, Takaaki Toriyama, Kazuhiro Yasuda, and Reinhard Niessner. "Catalytic Effect of Potassium Compounds in Soot Oxidation." ChemCatChem 9, no. 18 (June 9, 2017): 3513–25. http://dx.doi.org/10.1002/cctc.201700338.

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41

Goutfer-Wurmser, F., C. Hérold, and P. Lagrange. "Superdense potassium concentration in some graphite intercalation compounds." Carbon 33, no. 11 (1995): 1657–59. http://dx.doi.org/10.1016/0008-6223(95)96818-s.

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42

Aouad, Mohamed Reda, Mouslim Messali, Nadjet Rezki, Adeeb Al-Sheikh Ali, and Alain Lesimple. "Synthesis and characterization of some novel 1,2,4-triazoles, 1,3,4-thiadiazoles and Schiff bases incorporating imidazole moiety as potential antimicrobial agents." Acta Pharmaceutica 65, no. 2 (June 1, 2015): 117–32. http://dx.doi.org/10.1515/acph-2015-0011.

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Abstract (1,4,5-Triphenylimidazol-2-yl-thio)butyric acid hydrazide (3) was obtained via alkylation of 1,4,5-triphenylimidazol-2- thiol (1) with ethylbromobutyrate, followed by addition of hydrazine hydrate. Treatment of acid hydrazide 3 with carbon disulfide in an ethanolic potassium hydroxide solution gave the intermediate potassium dithiocarbazinate salt, which was cyclized to 4-amino-5-[(1,4,5-triphenylimidazol- -2-yl)thiopropyl]-2H-1,2,4-triazole-3-thione (4) in the presence of hydrazine hydrate. Condensation of compound 3 with alkyl/arylisothiocyanate afforded the corresponding 1-[4-(1,4,5-triphenylimidazol-2-ylthio)butanoyl]-4-alkyl/arylthiosemicarbazides (5-7), which upon refluxing with sodium hydroxide, yielded the corresponding 1,2,4-triazole - -3-thiols 8-10. Under acidic conditions, compounds 4-6 were converted to aminothiadiazoles 11-13. Moreover, the series of Schiff bases 14-18 were synthesized from the condensation of compound 3 with different aromatic aldehydes. The newly synthesized compounds were characterized by IR, 1H NMR, 13C NMR and mass spectral analyses. They were also preliminarily screened for their antimicrobial activity.

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Bozorov, Kh N., O. O. Mamatkarimov, and B. T. Abdulazizov. "Electric and ionic conductivity of potassium antimony tungstate with addition of alkali metals." «Узбекский физический журнал» 24, no. 2 (May 7, 2022): 129–30. http://dx.doi.org/10.52304/.v24i2.332.

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The electrical conductivity of complex oxides K1-xNaxSbWO6 (0≤x≤0.6) and K1-xLixSbWO6 (0≤ x≤0.4), which have a pyrochlore-type structure, was studied. The temperature dependence of the ion permeability of the compounds and the value of the ion radius were determined. As the ion radius value of the alkali metal decreases, the value of the activation energy decreases, and the ion permeability increases. A model of ion transport has been proposed in these compounds. It was found that the compound containing Li0.4K0.6SbWO6 reaches the maximum values of electrical conductivity.

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Williams, S. N., R. J. Gilkes, and N. G. Bernard. "Waste jarosite and alunite will be ineffective sulfur and potassium fertilisers." Soil Research 38, no. 2 (2000): 493. http://dx.doi.org/10.1071/sr99031.

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The processing of ilmenite to synthetic rutile produces an acidic sulfate- and iron-rich solution from which the mineral jarosite [KFe 3 (OH)6 (SO 4 ) 2 ] can be precipitated. Jarosite and isostructural alunite [KAl 3 (OH)6 (SO 4 ) 2 ], which may also be precipitated from processing waste, have the potential to be effective slow-release fertilisers on sandy soils. A glasshouse experiment was conducted on a very sandy soil in which the effectiveness of these two compounds as sulfur and potassium fertilisers was compared with that of control fertilisers (gypsum and KCl). Neither compound proved to be an effective fertiliser. Equilibrium solubilities of sulfate (63 mM, 173 mM) and potassium (60 mM, 70 mM) for jarosite and alunite, respectively, were very low, which is consistent with the relative ineffectiveness of these compounds as fertilisers.

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Gobesso, A. A. O., H. Wajnsztejn, R. M. Ribeiro, F. L. Bastos, M. Etchichury, and A. M. C. Araújo Júnior. "Comparison between different sources of minerals in horses with nutritional secondary hyperparathyroidism." Arquivo Brasileiro de Medicina Veterinária e Zootecnia 73, no. 1 (February 2021): 73–81. http://dx.doi.org/10.1590/1678-4162-12107.

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ABSTRACT Minerals perform several functions in the body, such as coagulation actions, muscle contraction, enzymatic and hormonal production, among others. This study aims to evaluate the effect of a 150 days chelated and not chelated mineral supplementation with and without potassium oxalate on serological parameters and bone mineral density of horses. Twenty-four crossbred yearlings (12 females and 12 males) with an average age of 21±3 months and body weight of 330.8±37.9kg were divided into four groups containing six equines in each (three females and three males) in a completely randomized design with repeated measurements in a 2x2 factorial arrangement. Treatments were: 1 - chelated minerals compound; 2 - chelated minerals compound and potassium oxalate; 3 - not chelated minerals compound; and 4 - not chelated minerals compound and potassium oxalate. Clinical signs of nutritional secondary hyperparathyroidism (NSH) were observed only in treatment 4. Results showed no treatment effect in bone biopsy for calcium, phosphorus and bone density. There were significant reductions of parathyroid hormone (PTH) means concentrations in treatments 2 and 4 during supplementation. Animals supplemented with chelated minerals compounds avoided mineral imbalances and NSH even when in dietary potassium oxalate challenged.

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Wrzosek, Antoni, Shur Gałecka, Monika Żochowska, Anna Olszewska, and Bogusz Kulawiak. "Alternative Targets for Modulators of Mitochondrial Potassium Channels." Molecules 27, no. 1 (January 4, 2022): 299. http://dx.doi.org/10.3390/molecules27010299.

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Mitochondrial potassium channels control potassium influx into the mitochondrial matrix and thus regulate mitochondrial membrane potential, volume, respiration, and synthesis of reactive oxygen species (ROS). It has been found that pharmacological activation of mitochondrial potassium channels during ischemia/reperfusion (I/R) injury activates cytoprotective mechanisms resulting in increased cell survival. In cancer cells, the inhibition of these channels leads to increased cell death. Therefore, mitochondrial potassium channels are intriguing targets for the development of new pharmacological strategies. In most cases, however, the substances that modulate the mitochondrial potassium channels have a few alternative targets in the cell. This may result in unexpected or unwanted effects induced by these compounds. In our review, we briefly present the various classes of mitochondrial potassium (mitoK) channels and describe the chemical compounds that modulate their activity. We also describe examples of the multidirectional activity of the activators and inhibitors of mitochondrial potassium channels.

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A. Jawad, Asmaa, and Ammar J. Alabdali. "Synthesis, Characterization and Antibacterial Activity of Some Penicillin Derivatives." Al-Nahrain Journal of Science 23, no. 4 (December 1, 2020): 29–34. http://dx.doi.org/10.22401/anjs.23.4.05.

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This study illustrated the synthesis of two new di amidine compounds ([c] and [d]) by reaction of 6-amino penicillanic acid (6-APA) with diα-amino nitrile compounds ([a] and [b]). [a] and [b] di α-amino nitrile compounds synthesized from the condensation reaction on aldehyd and di amine in the presence of potassium cyanid as one pot-three components reaction. The new di amidine compounds ([c] and [d]) have been proven their efficiency by inhibiting some types of bacteria (Staphylococcus aurous, Streptococcus, Escherichia coliand klebsiella). Amidine compound [d] showed better effect than [c] against the selected bacteria.The synthesized compounds were characterized by conventional techniques using infrared spectrophotometer (IR) andproton-nuclear magnetic resonance (1H-NMR)

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Šindelář, Karel, Karel Dobrovský, Ivan Krejčí, and Zdeněk Polívka. "Substituted 1-(2-Thienyl)cyclohexylamines and Related Compounds as Potential NMDA Antagonists." Collection of Czechoslovak Chemical Communications 60, no. 5 (1995): 894–902. http://dx.doi.org/10.1135/cccc19950894.

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Reactions of bisulfite addition compounds prepared in situ from cyclohexanone or 3,4,5,6-tetrahydro-2H-thiopyran-3-one with potassium cyanide and corresponding amines resulted with high yields in amino nitriles type of V and VI. These compounds were subjected to reactions with 2-thienylmagnesium bromide and in the case of the amino nitriles Vc and Vf with 5-bromo-2-thienylmagnesium bromide. Only in the case of compound Vf, a by-product X was isolated in addition to the desired 1-[1-(5-bromo-2-thienyl)-1-cyclohexyl]piperidine (VIIf). Compound VIIf was used for the synthesis of the carboxylic acid XI. The compounds prepared were tested by some methods of biochemical and behavioural pharmacology.

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Oliveira, Luciene A. de, Ernani C. da Silva, Lanamar de A. Carlos, and Gabriel M. Maciel. "Phosphate and potassium fertilization on agronomic and physico-chemical characteristics and bioactive compounds of eggplant." Revista Brasileira de Engenharia Agrícola e Ambiental 23, no. 4 (April 2019): 291–96. http://dx.doi.org/10.1590/1807-1929/agriambi.v23n4p291-296.

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ABSTRACT Eggplant is a functional food rich in antioxidants and its consumption brings several benefits to human health. Phenolic compounds and anthocyanins are some of the compounds that interfere in this antioxidant capacity and may be influenced by the mineral nutrition of the plant. The objective was to analyze the effects of potassium and phosphate fertilization on the agronomic and physico-chemical characteristics and bioactive compounds of eggplant fruits. The work was carried out at the Taboquinha Farm, in the municipality of Baldim, MG, at coordinates 19º 17’ 12.5” S and 43º 54’ 01” W, from March to October 2017. The experimental design was randomized blocks in a 4 x 4 factorial scheme with four replicates. The factors under study were phosphorus and potassium represented by four doses of P2O5 (0, 60, 120 and 180 kg ha-1) and four doses of K2O (0, 25, 50 and 75 kg ha-1), respectively. It was concluded that potassium and phosphate fertilization did not improve the agronomic and physico-chemical characteristics of eggplant fruits; however, potassium fertilization in greater amounts promoted improvements in the contents of phenolic compounds. The lack of phosphorus increased the anthocyanin content in the fruits, but interfered negatively in their shape. Potassium and phosphate fertilizations produced antagonistic effects on fruit moisture content.

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Rahman, Habibur. "Analytical Applications of Permanganate as an Oxidant in the Determination of Pharmaceuticals Using Chemiluminescence and Spectrophotometry: A Review." Current Analytical Chemistry 16, no. 6 (August 13, 2020): 670–86. http://dx.doi.org/10.2174/1573411015666190617103833.

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Background: Potassium permanganate is a green and versatile industrial oxidizing agent. Due to its high oxidizing ability, it has received considerable attention and has been extensively used for many years for the synthesis, identification, and determination of inorganic and organic compounds. Objective: Potassium permanganate is one of the most applicable oxidants, which has been applied in a number of processes in several industries. Furthermore, it has been widely used in analytical pharmacy to develop analytical methods for pharmaceutically active compounds using chemiluminescence and spectrophotometric techniques. Results: This review covers the importance of potassium permanganate over other common oxidants used in pharmaceuticals and reported its extensive use and analytical applications using direct, indirect and kinetic spectrophotometric methods in different pharmaceutical formulations and biological samples. Chemiluminescent applications of potassium permanganate in the analyses of pharmaceuticals using flow and sequential injection techniques are also discussed. Conclusion: This review summarizes the extensive use of potassium permanganate as a chromogenic and chemiluminescent reagent in the analyses of pharmaceutically active compounds to develop spectrophotometric and chemiluminescence methods since 2000.

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