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A versatile family of interconvertible microporous chiral molecular frameworks: The first example of ligand control of network chirality

Kepert, C. J.; Prior, T. J.; Rosseinsky, M. J.

Authors

C. J. Kepert

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Dr Tim Prior T.Prior@hull.ac.uk
Senior Lecturer in Inorganic Chemistry

M. J. Rosseinsky



Abstract

Two families of molecular frameworks which grow as homochiral single crystals are described. Both consist of multiple interpenetration of the three-connected chiral (10,3)-a (Y*) network and result from the tridentate coordination of the 1,3,5-benzenetricarboxylate (btc) ligand to octahedral metal centers which act as linear connectors. The nature of the interpenetration is controlled by the auxiliary ligands bound in the equatorial plane of the metal center. Ethylene glycol (eg) binds in a unidentate fashion to form phase A which has 28% accessible solvent volume and contains four interpenetrating (10,3)-a networks. 1,2-Propanediol (1,2- pd) coordinates as a bidentate ligand to yield a phase B with a greatly enhanced 51% of solvent accessible volume, because only two (distorted) (10,3)-a' networks interpenetrate. Ligands in the void space and bound to the metal center can both be liberated thermally: the kinetics of this process allow isolation of microporous desolvated crystalline A and B. The porous phases lose crystallinity reversibly upon further loss of ligands bound to the equatorial metal: crystallinity is restored upon exposure to the vapors of simple alcohols, which can also effect conversion of B to A. Both phases present interpenetrating network topologies that are unique to chemistry and adopt space groups that are new for molecular solids: A crystallizes in P4232 and B adopts I4132. B can be grown homochirally from enantiomerically pure diol template. The stereochemistry of the alcohol bound to the metal controls the helicity of the chiral framework. The structure determination of the 1,2-propanediol phase represents the first demonstration that chiral molecules can specifically template helix handedness in a chiral porous framework solid.

Citation

Kepert, C. J., Prior, T. J., & Rosseinsky, M. J. (2000). A versatile family of interconvertible microporous chiral molecular frameworks: The first example of ligand control of network chirality. Journal of the American Chemical Society, 122(21), 5158-5168. https://doi.org/10.1021/ja993814s

Journal Article Type Article
Online Publication Date May 16, 2000
Publication Date 2000-05
Deposit Date Dec 11, 2020
Journal Journal of the American Chemical Society
Print ISSN 0002-7863
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 122
Issue 21
Pages 5158-5168
DOI https://doi.org/10.1021/ja993814s
Keywords Alcohols; Metals; Ligands; Crystal structure; Molecules
Public URL https://www.scopus.com/inward/record.uri?eid=2-s2.0-0034738037&doi=10.1021%2fja993814s&partnerID=40&md5=934cc3c5da025a09e89e7f3c0606ae19
Publisher URL https://pubs.acs.org/doi/10.1021/ja993814s