Showing papers on "Potassium iodate published in 2001"
TL;DR: In this article, the polishing rates of copper and tantalum were measured using potassium iodate-based slurries containing silica abrasives for several concentrations of iodate and pH.
Abstract: Polish rates of copper and tantalum were measured using potassium iodate-based slurries containing silica abrasives for several concentrations of potassium iodate and pH. The tantalum polish rate increases rapidly with pH beyond pH 10.0 and with 3% silica reaches a value of about 215 nm/min while copper polish rate under the same conditions is only about 45 nm/min. Also, the dissolution/passivation behaviors of copper as well as tantalum were investigated by electrochemical measurements. © 2001 The Electrochemical Society. All rights reserved.
50 citations
TL;DR: In this article, an efficient and efficient route to 1,4-diacyl semicarbazides is described, where 1-Aryloxyacetyl-4-(5-(4-chlorophenyl)-2-furoyl)-thiosemicarbazide (Ia-i) is described.
11 citations
Patent•
12 Dec 2001
TL;DR: An additive for surface treatment is prepared from organic sulfonic acid (10-30 wt. portions) and the salt of oxygen-contained inorganic acid (0.5-1.5 wt.).
Abstract: An additive for surface treatment is prepared from organic sulfonic acid (10-30 wt. portions) and the salt of oxygen-contained inorganic acid (0.5-1.5 wt. portions). Said organic sulfonic acid is theone with less than 6 carbon atoms, which is one or more of methyl sulfonic acid, ethyl sulfonic acid and dimethyl sulfonic acid. Said salt is the one containing Cl, Br, or I, which is one or more of potassium iodate and potassium bromate.
5 citations
TL;DR: In this paper, a new catalytic spectrophotometric method for the determination of bromide is proposed, which is based on the bromides-catalyzed oxidation of this violet complex by iodate followed by measuring the color change at λ = 542 nm.
Abstract: A new catalytic spectrophotometric method for the determination of bromide is proposed. Diphenylcarbazide reacts with chromium(VI) ions in an acid medium to give a violet complex. The method is based on the bromide-catalyzed oxidation of this violet complex by iodate followed by measuring the color change at λ = 542 nm spectrophotometrically. The reaction starts after an induction period. Bromide ions catalyze this reaction, so that the induction period is decreased by the addition of Br–. The derivative of the absorbance with respect to time was calculated. The maximum absorbance difference (ΔAm) and thetime taken to reach the maximum difference (tm) were measured from the derivative curve. These values are used as the measured parameters for bromide determination. Under optimum conditions bromide can be determined in the range of 0.5–8 μg/mL. The detection limit is 0.25 μg/mL, and the relative standard deviation for ten replicate measurements of 1 μg/mL of bromide is 1.57%. The method was applied to the determination of bromide in the Persian Gulf water.
4 citations
TL;DR: In this paper, an efficient and efficient route to 1,4-diacyl semicarbazides is described, where 1-Aryloxyacetyl-4-(5-(4-chlorophenyl)-2-furoyl)-thiosemicarbazide (Ia-i) is described.
Abstract: Asim ple and efficient route to 1,4-diacyl semicarbazides is described. 1-Aryloxyacetyl-4-(5-(4-chlorophenyl)-2-furoyl)- thiosemicarbazides (Ia–i) on treatment with potassium iodate in the aqueous solution afford 1-aryloxyacetyl-4-(5- (4-chlorophenyl)-2-furoyl)-semicarbazides (IIa–i) in excellent yields.
15 Apr 2001
TL;DR: In this article, the active reagent is generated in situ, as needed, and used in situ for handling, storage, and precautions, and the reagent should be prepared in solution and used as needed.
Abstract: (I2) [7553-56-2] I2 (MW 253.80)
InChI = 1S/I2/c1-2
InChIKey = PNDPGZBMCMUPRI-UHFFFAOYSA-N
(KIO3) [7758-05-6] IKO3 (MW 214.00)
InChI = 1S/HIO3.K/c2-1(3)4;/h(H,2,3,4);/q;+1/p-1
InChIKey = JLKDVMWYMMLWTI-UHFFFAOYSA-M
(conversion of alkenes to iodohydrins;1 iodination of some aromatic molecules;2 the iodohydrins (or iodoacetates) formed are readily converted to cis-diols3)
Physical Data: KIO3: mp 560 °C; d 3.930 g cm−3. I2: see Iodine.
Solubility: KIO3: sol water: 9.16 g/100 g water at 25 °C and 32.2 g/100 g water at 100 °C.4 In other work, the solubility in water was measured to be: 8.40 g KIO3/100 g water at 25 °C; 13.7 g/100 g at 50 °C; and 24.4 g/100 g at 100 °C.5 It shows some solubility in aqueous dioxane mixtures: 8.472 g/100 g (0% dioxane∶100% water); 5.30 g/100 g (10% dioxane); 3.172 g/100 g (20% dioxane); 1.811 g/100 g (30% dioxane); 0.886 g/100 g (40% dioxane); and 0.471 g/100 g (50% dioxane). KIO3 insol pure dioxane and most common organic solvents.
Form Supplied in: the active reagent is generated in situ, as needed. KIO3: colorless monoclinic crystals; commercially available in at least 99.5% purity.
Preparative Method: in reactions with alkenes, the following ratio of reactants is typical: alkene∶KIO3∶I2, 4∶1∶2 in acetic acid.3 The iodine and potassium iodate are premixed in acetic acid at ambient temperatures and then treated with the organic substrate and allowed to react at a suitable temperature.
Handling, Storage, and Precautions: the reagent should be prepared in solution, as needed, and used in situ. Potassium iodate is an irritant, particularly of the upper respiratory tract. Ingestion causes headache, nausea and vomiting, dizziness, and gastrointestinal irritation. Avoid ingestion, skin contact, and eye contact. Potassium iodate is a powerful oxidant and should not be stored near combustible materials, near flammable materials, or near powdered metals. Mixing with powdered metals can cause an explosion. It should be stored in a separate and tightly closed container. This combination reagent should be handled in a fume hood.