Seleneto de sódio

Seleneto de sódio
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Nome IUPAC sodium selenide
Identificadores
Número CAS 1313-85-5
Propriedades
Fórmula química Na2Se
Massa molar 124.94 g mol-1
Aparência sólido amorfo
Densidade 2.62 g cm−3[1]
Ponto de fusão

>875 °C

Solubilidade em água reage com água
Compostos relacionados
Outros aniões/ânions Sulfeto de sódio
Telureto de sódio
Óxido de sódio
Outros catiões/cátions Seleneto de hidrogênio
Seleneto de antimônio
Seleneto de alumínio
Compostos relacionados Seleneto de sódio
Selenato de sódio
Página de dados suplementares
Estrutura e propriedades n, εr, etc.
Dados termodinâmicos Phase behaviour
Solid, liquid, gas
Dados espectrais UV, IV, RMN, EM
Exceto onde denotado, os dados referem-se a
materiais sob condições normais de temperatura e pressão

Referências e avisos gerais sobre esta caixa.
Alerta sobre risco à saúde.

Seleneto de sódio é um composto inorgânico de sódio e selênio com a fórmula Na2Se. Este sólido incolor é preparado pela reação de selênio com uma solução de sódio em amônia.[2]

Reações

Como outros calcogenetos de metais alcalinos, este material é altamente sensível à água, passando facilmente por hidrólise para dar misturas de biseleneto e hidróxido. Esta hidrólise ocorre devido à extrema alcalinidade do íon Se2-.

Na2Se + H2O → NaHSe + NaOH

Similarmente, seleneto de sódio é facilmente oxidado a polisselenetos, uma conversão sinalizado por amostras não brancas.

Seleneto de sódio reage com ácidos produzindo seleneto de hidrogênio gasoso tóxico.

Na2Se + 2 HCl → H2Se + 2 NaCl

O composto reage com eletrófilos para produzir os compostos de selênio. Com haletos de alquilo obtém-se uma variedade de compostos organoselênio:

Na2Se + 2 RBr → R2Se + 2 NaBr

Haletos de organoestanho e organosilício reagem similarmente haletos reagem da mesma forma para dar os derivados esperados:

Na2Se + 2 Me3ECl → (Me3E)2Se + 2 NaCl (E = Si, Ge, Sn)

Segurança

Segurança

Seleneto de sódio deve ser armazenado e manuseado longe de umidade e do ar.

Referências

  1. David R. Lide (ed.). CRC Handbook of Chemistry and Physics 90th ed. [S.l.: s.n.] ISBN 9781420090840 
  2. Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 421.
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