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[EN] The synthesis of crystalline molecular sieves with pore dimensions that fill the gap between microporous and mesoporous materials is a matter of fundamental and industrial interest(1-3). The preparation of zeolitic materials with extralarge pores and chiral frameworks would permit many new applications. Two important steps in this direction include the synthesis(4) of ITQ-33, a stable zeolite with 18 x 10 x 10 ring windows, and the synthesis(5) of SU-32, which has an intrinsically chiral zeolite structure and where each crystal exhibits only one handedness. Here we present a germanosilicate zeolite (ITQ-37) with extralarge 30-ring windows. Its structure was determined by combining selected area electron diffraction ( SAED) and powder X-ray diffraction (PXRD) in a charge-flipping algorithm(6). The framework follows the SrSi2 (srs) minimal net(7) and forms two unique cavities, each of which is connected to three other cavities to form a gyroidal channel system. These cavities comprise the enantiomorphous srs net of the framework. ITQ-37 is the first chiral zeolite with one single gyroidal channel. It has the lowest framework density (10.3 T atoms per 1,000 angstrom(3)) of all existing 4-coordinated crystalline oxide frameworks, and the pore volume of the corresponding silica polymorph would be 0.38 cm(3) g(-1).

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Autor(es)

Sun, Junliang -  Bonneau, Charlotte -  Cantin Sanz, Angel -  Corma Canós, Avelino -  Díaz Cabañas, Mª José -  Moliner Marin, Manuel -  Zhang, Daliang -  Li, Mingrun -  Zou, Xiaodong - 

Id.: 71304165

Idioma: eng  - 

Versión: 1.0

Estado: Final

Palabras claveQUIMICA ORGANICA - 

Tipo de recurso: info:eu-repo/semantics/article  -  info:eu repo/semantics/publishedVersion  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: Reserva de todos los derechos

Requerimientos técnicos:  Browser: Any - 

Relación: [References] CICYT/MAT2006-14274-C02-01
[References] Nature
[References] http://doi.org/10.1038/nature07957

Fecha de contribución: 24-may-2018

Contacto:

Localización:
* 0028-0836
* 10.1038/nature07957
* 19407798

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