TetrahedralcoordinationforZninhexacyanometallates:Structuresof Zn3A2[M(CN)6]2 xH2O withA ¼ K, Rb,CsandM ¼ Ru,Os
Zinc hexacyanoruthenate(II)andhexacyanoosmate(II)werepreparedandstudiedfromX-ray diffraction (XRD),infrared(IR),andthermogravimetric(TG)data.Thesecompoundswerefoundtobe isomorphouswiththeironanalogues,crystallizingwitharhombohedralunitcell(R 3c spacegroup), where thezincatomhastetrahedralcoordinatio...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2008 |
| País: | México |
| Institución: | Instituto Politécnico Nacional |
| Repositorio: | Repositorio Digital del IPN |
| OAI Identifier: | oai:www.repositoriodigital.ipn.mx:123456789/10986 |
| Acceso en línea: | http://hdl.handle.net/123456789/498 http://www.repositoriodigital.ipn.mx/handle/123456789/10986 |
| Access Level: | acceso abierto |
| Palabra clave: | Inorganiccompounds Microporousmaterials X-raydiffraction Crystalstructure |
| Sumario: | Zinc hexacyanoruthenate(II)andhexacyanoosmate(II)werepreparedandstudiedfromX-ray diffraction (XRD),infrared(IR),andthermogravimetric(TG)data.Thesecompoundswerefoundtobe isomorphouswiththeironanalogues,crystallizingwitharhombohedralunitcell(R 3c spacegroup), where thezincatomhastetrahedralcoordinationtoNendsofCNgroups.ForCs,compoundswith formulaunitZnCs2[M(CN)6] andacubicunitcell(Fm 3m) werealsoobtained.Thecrystalstructures for theeightcompositionswererefinedfromthecorrespondingX-raypowderdiffractionpatternsusing the Rietveldmethod.RelatedtothetetrahedralcoordinationfortheZnatom,therhombohedralphase has aporousframeworkwithellipsoidalcavitiesofabout12.5 9 8A˚ , communicatedbyelliptical windowsof 5A˚ . Withinthesecavitiestheexchangeablealkalimetalionsarefound.Thefillingofthe cavityvolumeiscompletedwithwatermolecules.IRspectrumsensescertainchargedelocalization from theinnermetal,throughthe p-back donationmechanism.ForOscompoundsthiseffectis particularlypronounced,relatedtoamorediffusedorbitalsforthismetal. & 2008ElsevierLtd.Allrightsreserved |
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