New low-dimensional zinc compounds containing zinc-oxygen-phosphorus frameworks: two-layered inorganic phosphites and a polymeric organic phosphinate Academic Article uri icon

abstract

  • Two new zinc phosphites have been prepared by reaction of zinc chloride with either calcium or strontium phosphite in aqueous phosphorous acid. The compounds have been characterized by single-crystal X-ray diffraction techniques. ZnCa(HPO3)2(H2O)2: P21/n, a = 7.131 (2) Å, b = 7.766 (2) Å, c = 14.479 (2) Å, β = 97.30 (2)°, V= 795.3 (3) Å3, Z = 4, R(F0) = 0.045 for 1063 observations (I > 3σ(I)) and 109 variables. ZnSr(HPO3)2(H2O)2: {formula-omited}, a = 7.728 (2) Å, b = 7.967 (2) Å, c = 7.448 (2) Å, α = 99.56 (2)°, β = 107.93 (2)°, γ = 100.51 (2)°, V= 416.6 (2) Å3, Z = 2, R(F0) = 0.034 for 1187 observations (I> 3σ(I)) and 109 variables. Both compounds have layered structures in which the zinc atoms are tetrahedrally coordinated and the Ca or Sr atoms are 8-coordinate. In each case, the interlayer region is lined with water molecules coordinated to the alkaline-earth-metal Ion. The modes in which Ca and Sr bridge the phosphite groups are different, however, resulting in layers with different topographies. These results, together with earlier work on Na+, K+, and Ba2+, are discussed in terms of the effect of the alkali or alkaline-earth metals on the observed structural trends. A new polymeric zinc phenylphosphinate has also been synthesized and its structure determined. Crystal data for ZnO2PHC6H5)2: C2/c, a = 15.763 (2) Å, b = 11.162 (2) Å, c = 8.272 (2) Å, β = 109.34 (2)°, V = 1373.2 (6) Å3, Z = 4, R(F0) = 0.047 for 480 observations (I > 3σ(I)) and 105 variables. The structure is compared with known phosphinates and phosphonates. © 1990, American Chemical Society. All rights reserved.

author list (cited authors)

  • Shieh, M., Martin, K. J., Squattrito, P. J., & Clearfield, A.

citation count

  • 59

publication date

  • March 1990