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- W2030253469 abstract "A new group of reagents—the 2,7-bisazo derivatives of chromotropic acid—has been synthesized and the reaction of these compounds with niobium studied. Reaction with niobium occurs in strongly acidic medium (1-3N) and is characterized by high sensitivity (ϵ = 30–50 × 103). The functional grouping responsible for the reaction was shown to be the o,o'-dihydroxyazo group. The analytical usefulness of the reagents is determined by the presence of the electron-withdrawing substituents and the nature of the diazo coupling component. Niobium reacts in partially hydrolysed form with these reagents, to give 1:1 complexes. Eine neue Gruppe von Reagentien—die 2,7-Bisazoderivate der Chromotropsäure—wurde dargestellt und die Reaktion dieser Verbindungen mit Niob untersucht. Die Reaktion mit Niob findet in stark saurem (1–3 N) Medium statt und ist durch hohe Empfindlichkeit gekennzeichnet (ϵ = 30–50 · 103). Es wurde gezeigt, daβ die für die Reaktion verantwortliche Gruppierung die 0,0'-Dihydroxyazogruppe ist. Der analytische Nutzen der Reagentien wird durch die Gegenwart der elektronensaugenden Substituenten und die Natur der Diazokupplungskomponente bestimmt. Niob reagiert in teilweise hydrolysierter Form mit den Reagentien zu 1:1-Komplexen. On a synthétisé un nouveau groupe de réactifs, les dérivés 2,7-bisazo de l'acide chromotropique, et étudié la réaction de ces composés avec le niobium. La réaction avec le niobium a lieu en milieu fortement acide (1 − 3N) et est caractérisée par une sensibilitéélevée (ϵ = 30 − 50 × 103). On a montré que le groupement fonctionnel responsable de la réaction est le groupe o,o'-dihydroxyazo. L'intérêt analytique des réactifs est déterminé par la présence des substituants attracteurs d'électrons et la nature du composant de diazocopulation. Le niobium réagit sous forme partiellement hydrolysée avec ces réactifs, donnant des complexes 1:1." @default.
- W2030253469 created "2016-06-24" @default.
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- W2030253469 date "1968-07-01" @default.
- W2030253469 modified "2023-10-18" @default.
- W2030253469 title "Arsenazo III and its analogues—V Complex formation of niobium with o,o'-dihydroxyazo compounds" @default.
- W2030253469 cites W2078443657 @default.
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- W2030253469 doi "https://doi.org/10.1016/0039-9140(68)80145-6" @default.
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