Mixed valences system in cobalt iron cyanide. Microporous structure stability
Divalent transition metal hexacyanoferrates( III) have a microporous framework appropriate for separation and storage of small molecules. The nature of such porous framework is found in the existence of systematic vacancies of the building unit, the hexacyanoferrate octahedral block, [Fe(CN)6], in t...
| Authors: | , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2007 |
| Country: | México |
| Institution: | Instituto Politécnico Nacional |
| Repository: | Repositorio Digital del IPN |
| OAI Identifier: | oai:www.repositoriodigital.ipn.mx:123456789/11144 |
| Online Access: | http://hdl.handle.net/123456789/657 http://www.repositoriodigital.ipn.mx/handle/123456789/11144 |
| Access Level: | Open access |
| Keyword: | Prussian blue analogue Porous material Porous framework Adsorption |
| Summary: | Divalent transition metal hexacyanoferrates( III) have a microporous framework appropriate for separation and storage of small molecules. The nature of such porous framework is found in the existence of systematic vacancies of the building unit, the hexacyanoferrate octahedral block, [Fe(CN)6], in the material structure. The relatively low thermal stability appears to be the main limitation of these materials for such applications. In the as-synthesized material the available free volume is occupied by water which, can be removed by moderated heating but always involving decomposition of at least a small sample fraction. For cobalt a unique behavior has been observed. The heating of cobalt(2+) hexacyanoferrate( III) leads to an inner charge transfer to form the mixed valences Co(2+)Co(III) hexacyanoferrate(II,III) system. |
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