Crystal engineering: some further strategies

Anthony, A. ; Desiraju, G. R. ; Jetti, R. K. R. ; Kuduva, S. S. ; Madhavi, N. N. L. ; Nangia, A. ; Thaimattam, R. ; Thalladi, V. R. (1998) Crystal engineering: some further strategies Crystal Engineering, 1 (1). pp. 1-18. ISSN 1463-0184

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Structural studies currently underway in our group are reported in this paper. Molecular symmetry is rarely carried over into the crystal, posing problems when high-symmetry networks are desired. This is illustrated by the low-symmetry structure of 2,4,6-trinitromesitylene. However, the involvement of the Cl3 supramolecular synthon ensures a hexagonal network structure for 2,4,6-tris-(4-chlorophenoxy)-1,3,5-triazine. Arguments following from the equivalence between molecular and supramolecular synthons lead to the tetragonal network structure of the 1:1 complex of tetraphenylmethane and CCl4. With a similar reasoning, 4-(triphenylmethyl)benzoic acid is identified as a precursor of a supramolecular wheel-and-axle host substance. The study of novel and weaker intermolecular interactions is often useful. In N,N'-dibenzyl-1,4-cubanedicarboxamide, the acidity of the cubyl C-H groups leads to the formation of C-H···O hydrogen bonds. Polymorphism is a difficult challenge for the crystal engineer and, in its most intriguing manifestation, two crystalline forms of a substance appear in the same crystallization batch. This is observed for 4,4-diphenyl cyclohexadienone. The ultimate frontier in the subject is an understanding of the phenomenon of crystallization, and the unexpected crystal structure of quinoxaline, with five symmetry-independent molecules, could possibly represent a case of arrested crystallization.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:A. Microporous Materials; A. Organic Compounds; C. X-ray Diffraction; D. Crystal Structure
ID Code:10873
Deposited On:09 Nov 2010 04:37
Last Modified:13 Jul 2012 09:58

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