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The Largely Unknown Class of Microporous Hybrid Materials : Clays Pillared by Molecules

Title data

Herling, Markus M. ; Breu, Josef:
The Largely Unknown Class of Microporous Hybrid Materials : Clays Pillared by Molecules.
In: Zeitschrift für anorganische und allgemeine Chemie. Vol. 640 (March 2014) Issue 3-4 . - pp. 547-560.
ISSN 1521-3749
DOI: https://doi.org/10.1002/zaac.201300540

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The review summarizes recent progress in the field of synthetic clay minerals pillared with organic or metal complex cations (PILCs). We briefly introduce the field of such PILCs and discuss the weaknesses of the state of the art characterization chart of PILCs. When PILCs are made from nanoscopic host materials like natural clay minerals, charge heterogeneity accompanied by interstratification, the turbostratic disorder in the stacking and the influence of the large external surface weaken essential analytical results. Turning to coarse-grained, well ordered clay minerals synthesized from the melt at temperatures above 1000 K removes all these obstacles and allows to present consistent data underlining the validity of the appealing pillaring concept: Refinement of PILC structures gives information on the pillar-host interaction and the orientation of pillars in the interlayer space. Two-dimensional superstructure reflections give direct evidence of the well-ordered lateral arrangement of pillars. And most importantly, analysis of chemical composition and physisorption isotherms are not corrupted by contributions of large external surfaces and this allows for predicting micropore volume and widths from pillar/host ratios in combination with pillar size/shape. Moreover, recent progress allows fine-tuning the charge density of the host lattice post-synthesis. Such deliberate and fine-graded alteration of the pillar density in turn permits adjusting the pore size in steps as small as 0.1 Å to a given adsorbate and thus will pave the way to maximize adsorption enthalpies and to improve selectivity. This feature is unique to PILCs and is not available to MOFs whose porosity can be adjusted only in steps no smaller than the order of chemical bond lengths. Rational design of microporous hybrid materials with full control over size, shape, and chemical nature of micropores certainly represents the strength and great potential of the pillaring approach.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Pillared Interlayered Clay; PILC; Clays; Microporous materials; Hybrid materials
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I > Chair Anorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP A 6
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 20 Mar 2018 10:35
Last Modified: 20 Mar 2018 10:35
URI: https://eref.uni-bayreuth.de/id/eprint/9278