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Abstract
The title phosphazene, P 3 N 3 R 4 XX, where R is 3,5-dimethylpyrazole and XX is a spiro-bonded −NHCH 2 CH 2 CH 2 NH− ring, has P−N bonds of 1.554 (5)-1.614 (5) A in the phosphazene ring with exocyclic bonds of 1.609 (5) and 1.635 (5) A to the spiro ring and 1.683 (4)-1.708 (5) A to the pyrazole groups. The N−P−N angle within the phosphazene ring at the unique P atom is 6.9 (3)° smaller than those at the other P atoms. One of the pyrazole-substituted P atoms is displaced by 0.252 (5) A from the best plane of the other five ring atoms, which are coplanar to within 0.087 (6) A. The −PNCCCN− ring conformation is intermediate between a boat and a twist-boat
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