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Published March 1, 2015 | Published + Supplemental Material
Journal Article Open

CIT-7, a crystalline, molecular sieve with pores bounded by 8 and 10-membered rings


A new crystalline molecular sieve, denoted CIT-7, is synthesized using an imidazolium-based diquaternary organic structure directing agent (OSDA). The framework structure is determined from a combination of rotation electron diffraction and synchrotron X-ray powder diffraction data. The structure has 10 crystallographically unique tetrahedral atoms (T-atoms) in the unit cell, and can be described as an ordered arrangement of the [4^(2)5^(4)6^(2)] mtw building unit and a previously unreported [4^(4)5^(2)] building unit. The framework contains a 2-dimensional pore system that is bounded by 10 T-atom rings (10-ring, 5.1 Å × 6.2 Å opening) that are connected with oval 8-rings (2.9 Å × 5.5 Å opening) through medium-sized cavities (~7.9 Å) at the channel intersections. CIT-7 can be synthesized over a broad range of compositions including pure-silica and heteroatom, e.g., aluminosilicate and titanosilicate, containing variants.

Additional Information

© 2015 Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Received 19th December 2014; accepted 13th January 2015. First published online 23 Jan 2015. We thank Dr Badri Shyam on the 2-1 Powder Diffraction Beamline at the Stanford Synchrotron Radiation Lightsource, for his assistance with the powder diffraction measurement. We would also like to thank Dr Sonjong Hwang (Caltech) for collecting the ^(29)Si and ^(19)F NMR spectra. We would also like to thank Dr Stacey Zones (Chevron Energy Technology Company) for insightful discussions. We would like to thank Chevron Energy Technology Company for providing funding for this work. J.E.S. would like to thank the NDSEG for their support through a fellowship.

Attached Files

Published - c4sc03935a.pdf

Supplemental Material - c4sc03935a1_si.pdf


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August 20, 2023
August 20, 2023