Issue 30, 2002

Crystal packing interpretation of the association of chiral threefold propeller ions: TRISPHAT anion with a triarylcarbenium cation

Abstract

Experiments attempting to use the chiral [tris(tetrachlorobenzenediolato)phosphate(V)] anion (TRISPHAT, 1) to induce a preferred configuration upon the [tris(4-dimethylaminobenzene)carbenium] cation of crystal-violet (2) via ion pairing with co-threefold-axial embraces of the propeller-shaped ions were not successful; no evidence was found for an asymmetric induction in solution. The salt that crystallises, [tris(4-dimethylaminobenzene)carbenium][tris(tetrachlorobenzenediolato)phosphate(V)] dichloromethane diethyl ether solvate (3), provides some understanding of this result through analysis of its crystal packing, in which there are no threefold coaxial cation·anion embraces, but there is a centrosymmetric (racemic), flattened, sixfold phenyl embrace (6PE) between cations 2. A dominant feature of the crystal packing is a centrosymmetric association of two anions and two cations. We attribute the lack of threefold hetero-ion embraces to incompatible canting of the aryl rings (propeller blades) in 1 and 2, and thereby can interpret the lack of transfer of chiral information between them. Modelling shows that there is compatible canting of the aryl rings of [Fe(phen)3] cations and 1, allowing the formation of excellent hetero-ion homochiral (OFF)3 embraces. Some calculated intermolecular energies are reported.

Article information

Article type
Paper
Submitted
12 Mar 2002
Accepted
20 May 2002
First published
19 Jun 2002

CrystEngComm, 2002,4, 165-170

Crystal packing interpretation of the association of chiral threefold propeller ions: TRISPHAT anion with a triarylcarbenium cation

J. Lacour, G. Bernardinelli, V. Russell and I. Dance, CrystEngComm, 2002, 4, 165 DOI: 10.1039/B202524H

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