Open AccessDimorphism in 4,4,6,6‐tetrachloro‐2,2‐(2,2‐dimethylpropane‐1,3‐dioxy)cyclotriphosphazene and 6,6‐dichloro‐2,2:4,4‐bis(2,2‐dimethylpropane‐1,3‐dioxy)cyclotriphosphazene
Author(s) -
Coles Simon J.,
Davies David B.,
Hacıvelioğlu Ferda,
Hursthouse Michael B.,
Ibişoğlu Hanife,
Kılıç Adem,
Shaw Robert A.
Publication year - 2007
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
eISSN - 1600-5759
pISSN - 0108-2701
DOI - 10.1107/s0108270107003046
Subject(s) - crystallography , space group , phosphazene , crystal structure , ring (chemistry) , chemistry , stereochemistry , x ray crystallography , physics , diffraction , polymer , organic chemistry , optics
A second, polymorphic, form of the previously reported compound 4,4,6,6‐tetrachloro‐2,2‐(2,2‐dimethylpropane‐1,3‐dioxy)cyclotriphosphazene, C 5 H 10 Cl 4 N 3 O 2 P 3 , is now reported. The molecular structures of these two compounds are similar, aside from minor conformational differences. However, the compounds crystallize in two different space groups and exhibit quite different crystal structure assemblies. Additionally, 6,6‐dichloro‐2,2:4,4‐bis(2,2‐dimethylpropane‐1,3‐dioxy)cyclotriphosphazene, C 10 H 20 Cl 2 N 3 O 4 P 3 , is shown to exhibit two different conformational polymorphs when crystallized from different solvent mixtures. The α form crystallizes in the space group Pnma with the molecular structure lying on a mirror plane (symmetry code: x , − y + , z ), whilst the β form is in the space group C 2/ c with the molecular structure lying on a twofold axis (symmetry code: − x , y , − z + ). The difference between the two molecular structures is in the conformation of the spiro‐ring substituents with respect to the phosphazene ring. The resulting crystal structures give rise to differing packing motifs.