Ácido tiociânico

Ácido tiociânico
Alerta sobre risco à saúde[1]
Outros nomes Tocianato de hidrogênio; Ácido sulfociânico; Sulfocianeto
Identificadores
Número CAS 463-56-9
PubChem 781
ChemSpider 760
ChEBI 29200
SMILES
InChI
1/CHNS/c2-1-3/h3H
Propriedades
Fórmula química CHNS
Massa molar 59.09 g mol-1
Densidade 2,04 g·cm-3[2]
Ponto de fusão

5 °C[2]

Solubilidade em água boa solubilidade[3]
Solubilidade solúvel em etanol e éter dietílico[4]
Riscos associados
Frases R R20/21/22 R32 R52/53
Frases S S2 S13 S61
Compostos relacionados
Compostos relacionados Ácido ciânico (HOCN)
Ácido selenociânico (HSeCN)
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.

Ácido tiociânico é um composto químico com a fórmula HSCN que existe como uma mistura com o composto isômero ácido isotiociânico (HNCS).[5] É o análogo de enxofre do ácido ciânico (HOCN).

É um ácido fraco, próximo ao forte, com um pKa de 1,1 a 20 °C e extrapolado a força iônica nula.[6]

HSCN é previsto como tendo uma ligação tripla entre carbono e nitrogênio. Ele tem sido observado espectroscopicamente mas não tem sido isolado como substância pura.[7]

Os sais e ésteres do ácido tiociânico são conhecidos como tiocianatos. Os sais são compostos do íon tiocianato (-SCN) e um cátion metálico disponível (e.g., tiocianato de potássio, KSCN). Os ésteres do ácido tiociânico tem a estrutura geral R-SCN.

Ver também

O Commons possui uma categoria com imagens e outros ficheiros sobre Ácido tiociânico

Referências

  1. ↑ Merck Index, 11th Edition, 9257.
  2. ↑ a b Registo de CAS RN 463-56-9 na Base de Dados de Substâncias GESTIS do IFA.
  3. ↑ Thieme Chemistry, ed. (2009). RÖMPP Online - Version 3.5. Stuttgart: Georg Thieme Verlag KG 
  4. ↑ Brockhaus ABC Chemie, VEB F. A. Brockhaus Verlag Leipzig 1965, S. 1413.
  5. ↑ Holleman, A. F.; Wiberg, E. Inorganic Chemistry Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
  6. ↑ Martell, A. E.; Smith, R. M.; Motelaitis, R. J. NIST Database 46 National Institute of Standards and Technology: Gaithersburg, MD, 2001.
  7. ↑ Wierzejewska, M.; Mielke, Z. (2001). «Photolysis of Isothiocyanic Acid HNCS in Low-Temperature Matrices. Infrared Detection of HSCN and HSNC Isomers». Chemical Physics Letters. 349: 227–234. doi:10.1016/S0009-2614(01)01180-0 
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