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Color reaction
About: Color reaction is a research topic. Over the lifetime, 1194 publications have been published within this topic receiving 19579 citations.
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TL;DR: In this paper, the color reactions of cyclohexanone and acetophenone with 1, 3, 5-trinitrobenzene were investigated, and two main coloring matters, a Meisenheimer type compound, IV Na and a tricyclic type compound V Na, were isolated from the reaction mixture of cyclosanone.
Abstract: The color reactions of cyclohexanone, and acetophenone, with 1, 3, 5-trinitrobenzene were investigated. Two main coloring matters, a Meisenheimer type compound, IV Na and a tricyclic type compound, V Na, were isolated from the reaction mixture of cyclohexanone. In the case of the reaction of acetophenone with excessive 1, 3, 5-trinitrobenzene, the Meisenheimer type compound, VII Na, was the sole coloring matter. From a comparison of the absorption spectral behavior of them with the color reaction mixtures, mechanisms of the color reactions of cyclohexanone, and acetophenone, under the spot test procedure were elucidated.
4 citations
Patent•
28 Feb 1990
TL;DR: Trehalostatin has the following physicochemical properties: form: white powder, solubility: soluble in water, and difficultly soluble in hexane, benzene, ether and petroleum ether, UV spectrum: no absorption maxima above 220 nm, color reaction: positive in Rydon-Smith reaction, and negative in ninhydrin reaction, 3,6-dinitrophthalate reaction and Elson-Morgan reaction, molecular weight:366 (m/z 367, M+H, according to SIMS),[α]D: +115°
Abstract: This invention relates to a new substance trehalostatin, a method of producing said substance, and an actinomycete producing said substance. Trehalostatin has the following physicochemical properties: form: white powder, solubility: soluble in water, and difficultly soluble in hexane, benzene, ether and petroleum ether, UV spectrum: no absorption maxima above 220 nm, color reaction: positive in Rydon-Smith reaction, and negative in ninhydrin reaction, 3,6-dinitrophthalate reaction and Elson-Morgan reaction, molecular weight:366 (m/z 367, M+H, according to SIMS),[α]D: +115°. Trehalostatin exhibits an inhibitory effect on insect, especially trehalose of Aldrichia grahami , even at an extremely low concentration and thus is useful as an insecticide.
4 citations
TL;DR: In this paper, a test procedure was developed for the determination of mercury(I, II) on the surface of a polycaproamide membrane with a detection limit of <50 ng in the adsorbent zone.
Abstract: It was found that mercury(I, II) reacts with 5-chloro-2-hydroxy-3-[(tetrahydro-2,4-dithioxo-1,3-thiazin-5-yl)azo]benzenesulphonic acid (tyrodine) in weakly acid solutions in the presence of acetates, formates, and some organic solvents (ethanol and acetone) to give an intensely colored insoluble compound (λmax = 600 nm, e > 3 × 104). The composition of the solution affected the sensitivity of the color reaction between mercury and tyrodine. A test procedure was developed for the determination of mercury(I, II) on the surface of a polycaproamide membrane with a detection limit of <50 ng in the adsorbent zone. The procedure involves the quantitative and selective adsorption of the mercury complex of tyrodine on the support surface from 0.5 M acetate solutions of pH 3–4 in the dynamic mode; the sample volume was 5–25 mL. Mercury was then determined by the change in the support color using a color scale or by the change in diffuse reflectance at 600 nm. The adsorption of the mercury complex was accompanied by an abrupt change in the color of the support surface from pale crimson (reagent) to stable blue-violet. The test procedure was used in the analysis of an industrial sample of complex composition with a mercury concentration of lower than 0.05%. The determination error (relative standard deviation) was 20%.
4 citations
01 Jan 2013
TL;DR: In this article, the authors used acetylpyridine semicarbazone (APS) for the spectrophotometric determination of copper(II) in aqueous medium.
Abstract: Acetylpyridine semicarbazone (APS) has been used for the spectrophotometric determination of copper(II) in aqueous medium. APS react with copper(II) in slightly acidic (pH,6.0) medium. The colour reactions between APS and copper(II) is instantaneous and the absorbance of complex remains constant for over 24h. The maximum absorbance (max ), composition, molar absorptivity and sandells sensitivity of Cu-APS complex respectively are 355 nm, 1:2, 9.8×10 3 L. mol -1 .cm -1 and 0.064µgcm -2 of Cu(II) respectively. The systems obey Beer's law for 0.254-5.183 µg/ml of Cu(II). Spectrophotometric data of colour reaction between copper(II) and 2-acetylpyridinethiosemicarbazone(APT)are included for comparison. Large number of cations, anions and complexing agents (e.g. triethanolamine, thiourea) do not interfere in the determination of APS method. The method is successfully applied for the determination of copper in biological, leafy vegetable and synthetic alloy samples.
4 citations
TL;DR: In this article, the CPB2.1%PV 2.6×10-3M (CPB1.1%) was used to achieve 1:1/3.
Abstract: タンタルは酸性で臭化セチルピリジニウム(CPB)存在においてピロカテコールバイオレットと青色錯体を生成し,吸収極大は605～610nmである.また見かけのモル吸光係数は数万の値を示す.CPBが存在しない場合にもやはり同じ条件で同様に呈色し,吸収極大波長は変化しないが,見かけのモル吸光係数は前者の約1/3である.発色の最適条件はCPB1.6×10-3Mにおいて1:1塩酸5～8 ml/25 ml,0.1%PV 2.0ml/25 mlで4・5～45μg/25mlの範囲でベールの法則をほぼ満足する. 呈色は少なくとも20時間は安定である.PVの添加量をさらに増加した場合,605～610nmの吸収はほとんど変化しないが,新たに440および540～550nmの二つの極大が現われ,前者はタンタルの濃度とかかわりなく一定である。後者はタンタルの濃度が増すにつれて増大するが比例性はわるい.この二つの吸収はタンタル-PV相互反応により生ずるある種の集合体に基因するメタクロマジー帯であろうと考えられる.
4 citations