Wo. Lin et al., SYNTHESIS AND X-RAY STRUCTURE OF DIISOPROPYLPHOSPHORYL ALKANEDIYL DIISOTHIOUREA, Phosphorus, sulfur and silicon and the related elements, 85(1-4), 1993, pp. 113-118
Symmetric organic compounds containing I-phosphoryl-3-imino groups wer
e prepared by a two phase reaction between the corresponding dialkylph
osphite and alkanediyl diisothiourea. The X-ray structure analysis sho
wed that the diisopropylphosphoryl ethylenediisothiourea IIa crystalli
zed in the orthorhombic space group Pbca with the cell dimensions a =
16.660(3) angstrom, b = 8.910(2) angstrom, c = 17.457(3) angstrom, z =
4, at -100-degrees-C. The coordination around the phosphorus atom in
the molecule is distorted tetrahedrally. The molecule has moieties sli
ghtly out of plane around O=P-N-C-N with strong intermolecular hydroge
n bonds.