Synthesis and structure of the medium-pore zeolite PST-35 with two interconnected cages of unusual orthorhombic shape. Issue 35 (24th August 2022)

• Record Type: Journal Article
• Authors: Kemp, Kingsley Christian; Choi, Wanuk; Jo, Donghui; Park, Sung Hwan; Hong, Suk Bong
• Is Part Of: Chemical science. Volume 13:Issue 35(2022)
• Page Start: 10455
• Page End: 10460
• Publication Date: 2022-08-24
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2sc03628b
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : A medium-pore zeolite containing 2 novel orthorhombic-shaped cages was synthesized by combining the tendency of Ge to form double 4-ring units with the structure-directing ability of 1, 2, 3-triethylimidazolium ions under excess fluoride conditions. Abstract : The search for new zeolite structures and compositions remains important in synthetic materials science due to the high impact on developing new chemical technologies, as well as on improving existing ones. Herein we present the synthesis and structure of PST-35, a novel medium-pore germanosilicate (Si/Ge = 2.1–6.6) zeolite, achieved by combining the excess fluoride approach and the unique structure directing ability of Ge in the presence of 1, 2, 3-triethylimidazolium ions as an organic structure-directing agent. PST-35 contains a zig-zag 10-ring (4.6 × 6.7 Å) channel system constructed of strictly alternating large 28-hedral ([4 8 ·5 8 ·6 8 ·8 2 ·10 2 ]) and smaller 18-hedral ([4 6 ·5 4 ·6 4 ·8 2 ·10 2 ]) cages of anomalous orthorhombic shape. The PST-35 structure is built from the connection of pst-35 layers consisting of small 8-hedral ([4 3 ·5 4 ·6]) cages, previously unobserved zeolite building layers, through single 4-rings.