Π–π Interactions Between Aromatic Groups in Amphiphilic Molecules: Directing Hierarchical Growth of Porous Zeolites. (31st October 2019)

• Record Type: Journal Article
• Authors: Zhang, Yunjuan; Che, Shunai
• Is Part Of: Angewandte Chemie. Volume 132:Number 1(2020)
• Page Start: 50
• Page End: 60
• Publication Date: 2019-10-31
• Subjects: Amphiphile -- Mesostrukturen -- π-Wechselwirkungen -- Selbstorganisation -- Zeolithe; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201903364
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: The development of hierarchical macro‐ or mesoporous zeolites is essential in zeolite synthesis because the size of the micropores limits mass transport and their use as industrial catalysts for bulky molecules. Although major breakthroughs have been achieved, fabricating crystallographically ordered mesoporous zeolites using a templating strategy is still an unsolved challenge. This minireview highlights our recent efforts on the self‐assembly of amphiphilic molecules to obtain ordered hierarchical MFI zeolites by introducing aromatic groups into the hydrophobic tail of the amphiphilic molecules. Owing to the geometric matching between the self‐assembled aromatic tails and the MFI framework, a) single‐crystalline mesostructured zeolite nanosheets (SCZNs), b) SCZNs with a 90° rotational intergrowth structure, c) a hierarchical MFI zeolite with a two‐dimensional square P 4 mm mesostructure, and d) a single‐crystalline mesoporous ZSM‐5 with three‐dimensional pores and sheetlike mesopores layered along the a ‐axis were successfully synthesized. Abstract : Wachstumschance : Aromatische Segmente wie Biphenyl, Naphthyl, Azobenzol, Benzol und 1, 3, 5‐Triphenylbenzol können in Alkylketten eingeführt werden. Die starren Segmente ordnen sich zu hydrophoben Zentren mit geordneter Ausrichtung an, die das Wachstum von Zeolithkristallen blockieren und sich geometrisch dem Zeolithgerüst anpassen. Angebundene quartäre Ammoniumgruppen steuern die Zeolithbildung.