A. N. Chekhlov
2004
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Journal
Russian Journal of Inorganic Chemistry
Abstract
The crystals of the "acid" sodium salt of E-2-phenylethynylphosphonic acid, NaHOP(O 2 )CH=CHPh (I), were obtained and studied by X-ray diffraction. The triclinic structure of I (space group P1, a = 5.987 A, b = 7.747 A, c = 19.216 A, α = 87.56°, β = 85.07°, γ= 89.95°, Z= 4) was solved by direct methods and refined by full-matrix least-squares calculations in the anisotropic approximation to R = 0.063 for 3737 independent measured reflections (CAD4 automated diffractometer, λCuK α ). The structure of I contains two crystallographically independent Na + cations and phosphonate anions related by a glide-reflection plane, hence, having similar bond lengths and angles. The coordination polyhedra of two Na + cations (CN = 5) are distorted tetragonal pyramids composed of the O atoms of two phosphonate anions. The crystal structure of I is composed of sheets consisting of the Na + polyhedra, HOPO - 2 groups, and -CH=CHPh fragments of all the phosphonate anions.