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In chemistry, triiodide usually refers to the triiodide ion, I−3. This anion, one of the polyhalogen ions, is composed of three iodine atoms. It is formed by combining aqueous solutions of iodide salts and iodine. Some salts of the anion have been isolated, including thallium(I) triiodide (Tl+[I3]−) and ammonium triiodide ([NH4]+[I3]−). Triiodide is observed to be a red colour in solution.

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rdf:type
rdfs:label
  • Triioduro (it)
  • Triiodure (fr)
  • 三ヨウ化物 (ja)
  • Triiodide (en)
  • 三碘阴离子 (zh)
rdfs:comment
  • 三ヨウ化物（さんヨウかぶつ、英語: triiodide）は、主に3つのヨウ素原子による多原子アニオン、三ヨウ化物イオン (I3−) を含む塩を意味する。例えば三ヨウ化ナトリウム、三ヨウ化アンモニウムがこれに含まれ、これらにはそれぞれ対応する（モノ）ヨウ化物が存在する。この他の化合物、三ヨウ化窒素、三ヨウ化リン、三ヨウ化アンチモン、そしてなどは、ヨウ素原子同士が結合しておらず、三ヨウ化物イオンを形成しない。タリウムはヨウ化タリウム(III)が発見されないため三ヨウ化タリウム(I)と表される。 (ja)
  • Lo ione triioduro è un di formula I−3. Fa parte dei ed è il più semplice di essi. Viene preparato dissolvendo dei cristalli di iodio in una soluzione di ioduro (solitamente KI): I2 + I− → I−3 la reazione, che avviene in eccesso di I−, ha Keq= 710. La reazione è di facile visualizzazione in quanto si ha un netto viraggio dall'incolore al giallo-bruno. Il colore dipende dalla concentrazione: le soluzioni diluite appaiono gialle, mentre aumentando la concentrazione diventano brune. (it)
  • In chemistry, triiodide usually refers to the triiodide ion, I−3. This anion, one of the polyhalogen ions, is composed of three iodine atoms. It is formed by combining aqueous solutions of iodide salts and iodine. Some salts of the anion have been isolated, including thallium(I) triiodide (Tl+[I3]−) and ammonium triiodide ([NH4]+[I3]−). Triiodide is observed to be a red colour in solution. (en)
  • 在化学中，三碘化物有多种含义。它主要指三碘阴离子——I3−，一种由3个碘原子构成的多碘离子。含有这种离子的化合物有三碘化钠、三碘化铊和三碘化铵([NH4][I3])。这些化合物中只有单个对应的碘离子。在其他一些化合物中，三碘化物中3个碘原子之间并没有形成共价键，也就是没有形成三碘阴离子。例如三碘化氮 (NI3)、三碘化磷、三碘化锑和三碘化镓 (Ga2I6)。一些阳离子理论上有可能同时形成这两种化合物，三碘化铊被认为是三碘化铊(I)，而三碘化铊(III)还未制得。 (zh)
  • En chimie, triiodure (parfois écrit tri-iodure) peut désigner : * l'ion triiodure I3−, c'est-à-dire l'anion formé par trois atomes d'iode, * des sels de l'anion triiodure avec un cation, comme le NaI3, le TlI3 et le NH4I3 (chacun de ces composés a son iodure équivalent, à un seul atome d'iode : NaI, et NH4I), * des composés qui ne contiennent pas d'ion triiodure mais, simplement, trois atomes d'iode non liés entre eux, comme le triiodure d'azote NI3, le PI3, le SbI3 et le GaI3. Il se forme à partir de l'ion iodure selon la réaction d'équilibre : I2 + I− I3− (fr)
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