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Prometium(III) klorida

Prometium(III) klorida

Struktur kristal
Nama
Nama lain
Prometium triklorida
Prometium klorida
Penanda
Model 3D (JSmol)
3DMet {{{3DMet}}}
ChemSpider
Nomor EC
Nomor RTECS {{{value}}}
  • InChI=1S/3ClH.Pm/h3*1H;/q;;;+3/p-3
    Key: KAKNBYVEBALXNX-UHFFFAOYSA-K
  • [Cl-].[Cl-].[Cl-].[Pm+3]
Sifat
Cl3Pm
Massa molar 251,35 g·mol−1
Densitas 4,19 g/cm3 (dihitung, XRD)[1]
Titik lebur 655 °C (1.211 °F; 928 K)[2]
Struktur
Trigonal, hP8
P63/m, No. 176[1]
Senyawa terkait
Anion lain
Prometium(III) oksida
Kation lainnya
Neodimium(III) klorida
Samarium(III) klorida
Kecuali dinyatakan lain, data di atas berlaku pada suhu dan tekanan standar (25 °C [77 °F], 100 kPa).
Referensi

Prometium(III) klorida adalah sebuah senyawa anorganik dari prometium dan klorin dengan rumus PmCl3. Senyawa ini adalah garam kristalin ionik yang dapat larut dalam air dan bersinar dalam gelap dengan cahaya biru atau hijau pucat karena radioaktivitas prometium yang kuat.

Pembuatan

Prometium(III) klorida diperoleh dari prometium(III) oksida dengan memanaskannya dalam aliran HCl kering pada suhu 580 °C.[3]

Sifat

Prometium(III) klorida merupakan padatan berwarna lembayung dengan titik lebur 655 °C.[4] Senyawa ini mengkristal dalam sistem kristal heksagonal (jenis NdCl3) dengan parameter kisi a = 739 pm dan c = 421 pm dengan dua unit formula per sel unit dan memiliki kerapatan terhitung sebesar 4,19 g·cm−3.[5][6] Ketika PmCl3 dipanaskan dengan adanya H2O, akan dihasilkan prometium(III) oksiklorida (PmOCl) yang berwarna pink pucat.[5][7]

Aplikasi

Prometium(III) klorida (dengan 147Pm) telah digunakan untuk menghasilkan cahaya yang tahan lama pada tombol dan lampu sinyal. Aplikasi ini mengandalkan sifat prometium yang tidak stabil, yang memancarkan radiasi beta (elektron) dengan waktu paruh beberapa tahun. Elektron diserap oleh fosfor, menghasilkan cahaya yang terlihat.[8] Tidak seperti kebanyakan nuklida radioaktif lainnya, prometium-147 tidak memancarkan partikel alfa yang akan mendegradasi fosfor.[9]

Referensi

  1. ^ a b Weigel, F.; Scherer, V. (1967). "Die Chemie des Promethiums". Radiochimica Acta. 7. doi:10.1524/ract.1967.7.1.40. 
  2. ^ Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (edisi ke-92). Boca Raton, FL: CRC Press. hlm. 4.84. ISBN 1439855110. 
  3. ^ Gmelins Handbuch der anorganischen Chemie, System No. 39, hlm. 61–62.
  4. ^ Wiberg, Egon; Wiberg, Nils (2007). Holleman, Arnold F.; Fischer, Gerd, ed. Lehrbuch der anorganischen Chemie (edisi ke-102., stark umgearbeitete und verbesserte Auflage). Berlin New York: Walter de Gruyter. ISBN 978-3-11-017770-1. 
  5. ^ a b Weigel: Die Chemie des Promethiums, hlm. 588–589.
  6. ^ Gmelins Handbuch der anorganischen Chemie, System No. 39, hlm. 181.
  7. ^ Gmelins Handbuch der anorganischen Chemie, System No. 39, hlm. 31.
  8. ^ Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (edisi ke-92). Boca Raton, FL: CRC Press. hlm. 4.28. ISBN 1439855110. 
  9. ^ Lavrukhina, Avgusta Konstantinovna; Pozdnyakov, Aleksandr Aleksandrovich (1966). Аналитическая химия технеция, прометия, астатина и франция [Kimia Analitik dari Teknesium, Prometium, Astatin, dan Fransium] (dalam bahasa Rusia). Nauka. hlm. 118. 

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