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Eight-coordinate fluoride in a silicate double-four-ring. | LitMetric

Eight-coordinate fluoride in a silicate double-four-ring.

Proc Natl Acad Sci U S A

Inorganic Materials Chemistry, Schuit Institute of Catalysis, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands.

Published: January 2017

AI Article Synopsis

Article Abstract

Fluoride, nature's smallest anion, is capable of covalently coordinating to eight silicon atoms. The setting is a simple and common motif in zeolite chemistry: the box-shaped silicate double-four-ring (D4R). Fluoride seeks its center. It is the strain of box deformation that keeps fluoride in the middle of the box, and freezes what would be a transition state in its absence. Hypervalent bonding ensues. Fluoride's compactness works to its advantage in stabilizing the cage; chloride, bromide, and iodide do not bring about stabilization due to greater steric repulsion with the box frame. The combination of strain and hypervalent bonding, and the way they work in concert to yield this unusual case of multiple hypervalence, has potential for extension to a broader range of solid-state compounds.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5293034PMC
http://dx.doi.org/10.1073/pnas.1615742114DOI Listing

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