Cobalt alums. A demonstration experiment
Кобальтовые квасцы: демонстрационный эксперимент
2002-08-01
SCID: 54.1/gj5pk6gq
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[Co(H2O)6]3+ammonium cobalt alum (NH4)Al(SO4)2·12H2Ocesium cobalt alum CsCo(SO4)2·12H2Ohexaaquacobalt(III)oxidation with hydrogen peroxide
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Abstract (AI)
The demonstration experiment describes the isolation of [Co(H 2 O) 6 ] 3+ both as the pure blue crystalline cesium cobalt alum, CsCo(SO 4 ) 2 ·12H 2 O, and as a light greenish-blue solid solution of ammonium cobalt alum in (NH 4 )Al(SO 4 ) 2 ·12H 2 O. The hexaaquacobalt(III) ion is prepared chemically by oxidation with hydrogen peroxide, taking advantage of the stabilization of Co III relative to Co II by complexation with the carbonate ligand. A brief description of alum structure and a characterization of alum subclasses are included.
Key Findings
1
Hexaaquacobalt(III) ion generated by oxidation with hydrogen peroxide using carbonate ligand stabilization of CoIII over CoII
2
Preparation of [Co(H2O)6]3+ as a light greenish-blue solid solution in ammonium cobalt alum (NH4)Al(SO4)2·12H2O
3
Successful isolation of [Co(H2O)6]3+ as pure blue cesium cobalt alum CsCo(SO4)2·12H2O
4
The paper includes a concise description of alum crystal structure and characterization of alum subclasses
Research Object
Hexaaquacobalt(III) ion [Co(H2O)6]3+ isolated as cesium cobalt alum CsCo(SO4)2·12H2O and as ammonium cobalt alum solid solution in (NH4)Al(SO4)2·12H2O
Research Subject
Preparation (oxidation with H2O2 and stabilization via carbonate complexation), isolation, and characterization of the hexaaquacobalt(III) species within alum crystal hosts and discussion of alum structure/subclasses
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2002-08-01
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