Details

Autor(en) / Beteiligte

• Hennig, Christoph
• Takao, Shinobu
• Takao, Koichiro
• Weiss, Stephan
• Kraus, Werner
• Emmerling, Franziska
• Scheinost, Andreas C

Titel

Structure and stability range of a hexanuclear Th(IV)-glycine complex

Ist Teil von

• Dalton transactions : an international journal of inorganic chemistry, 2012-01, Vol.41 (41), p.12818-12823

Ort / Verlag

England

Erscheinungsjahr

2012

Quelle

MEDLINE

Beschreibungen/Notizen

• A hexanuclear Th(IV)-glycine complex was observed by Th L(3)-edge EXAFS measurements in an aqueous solution. Within the stability range of this complex the positively charged hexanuclear species [Th(6)(μ(3)-O)(4)(μ(3)-OH)(4)(H(2)O)(6)(Gly)(6)(HGly)(6)](6+) was preserved in a crystal with the composition [Th(6)(μ(3)-O)(4)(μ(3)-OH)(4)(H(2)O)(6)(Gly)(6)(HGly)(6)]·(NO(3))(3)(ClO(4))(3)(H(2)O)(3). This complex appears as a result of a competing reaction between hydrolysis and ligation by glycine. At a pH value below the stability range of the hexanuclear complex, crystals with the composition [Th(H(2)O)(3)(HGly)(3)]·(ClO(4))(4)H(2)O were obtained from the solution. Three water molecules in the thorium coordination sphere indicate that this complex occurs prior to the onset of Th(IV) hydrolysis.