Conformational polymorphism in a chiral spiro-cis-ansa-bridged cyclotriphosphazene derivative

Coles, S. J., Davies, D. B., Hursthouse, M. B., Ibisoglu, H., Kilic, A. and Shaw, R. A. (2002) Conformational polymorphism in a chiral spiro-cis-ansa-bridged cyclotriphosphazene derivative. Acta Crystallographica Section C: Crystal Structure Communications, C58, (1), O51-O54. (doi:10.1107/S010827010101770X).


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The reaction of spermidine with 2,2,4,4-tetrachloro-6,6-diphenylcyclotriphosphazene produces a mixture of products of which one of the fractions is a spiro-cis-ansa derivative, namely 12-chloro-14,14-diphenyl-2,6,11,13,15,16-hexaaza-1,12-diphosphatricyclo[,6)]hexadeca-12,14-diene, C19H26ClN6P3. Recrystallization of this fraction from different solvents results in the formation of two different crystalline forms. The rod morphology formed in dichloromethane-n-hexane (1:1) produces a triclinic structure with three molecules in the asymmetric unit. These three molecules adopt different conformations as a result of two NH groups flipping in an ansa-bridged ring system. The plate morphology crystals, grown in dichloromethane-n-hexane-ethyl acetate (1:1:1), produce a C-centred monoclinic structure that adopts a conformation that is essentially the same as one of the forms in the triclinic structure.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1107/S010827010101770X
Related URLs:
Keywords: crystal-structure
Subjects: Q Science
Q Science > QD Chemistry
Divisions : University Structure - Pre August 2011 > School of Chemistry
ePrint ID: 19699
Accepted Date and Publication Date:
1 January 2002Published
Date Deposited: 16 Feb 2006
Last Modified: 31 Mar 2016 11:36

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