Abstract
Crystals of the title compound are monoclinic with a= 10·18 ± 0·02 b= 9·00 ± 0·02, c= 13·04 ± 0·02 A. and β= 123·1°± 0·1°, space group P21/c with Z= 2. The atomic positions have been determined by Patterson and Fourier methods and refined by least-squares to R 0·073 (1281 reflexions) from X-ray diffraction data. The molecule has a centre of symmetry and the eight-membered P4N4 ring has a chair conformation. The mean P–N ring bonds are 1·55 A and the mean P–N–P and N–P–N angles are 139·5 and 121·3°. The four phosphorus atoms are coplanar with two pairs of non-equivalent nitrogen atoms displaced 0·40 and 0·19 A from the plane. The mean P–N(amine) bond is 1·61 A implying a high π-bond order.
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