Syntheses and Crystal Structures of the New Zinc Phosphonates Zn(O3PCH2P(O)(R)(C6H5))·xH2O, Based on Mixed Phosphonic Acid−Phosphine Oxide Building Blocks

Abstract
The two new zinc(II) phosphonates Zn(O3PCH2P(O)(C6H5)2) (monoclinic P21/c (No. 14), a = 9.961(2) Å, b = 5.838(1) Å, c = 24.608(5) Å, β = 101.48(3)°, Z = 4) and Zn(O3PCH2P(O)(CH3)(C6H5))·0.67H2O (monoclinic P21/c (No. 14), a = 15.879(5) Å, b = 7.383(2) Å, c = 10.475(3) Å, β = 105.01(5)°, Z = 4) were prepared by reaction of zinc nitrate, (R)(C6H5)P(O)CH2PO3H2 [R = C6H5, CH3], and sodium hydroxide in water in an autoclave. For the first compound, a unidimensional arrangement is observed, while for the second, a layered structure is obtained, in relation to the size of the substituents present on the phosphine oxide moiety.